392a8adc41
At this point random_ops[] only contains normals, so there's no need to do anything to them. In fact, raising the exponent here can make the output !normal, which is precisely what the comment says we want to avoid. Signed-off-by: Emilio G. Cota <cota@braap.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
632 lines
17 KiB
C
632 lines
17 KiB
C
/*
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* fp-bench.c - A collection of simple floating point microbenchmarks.
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*
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* Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
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*
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* License: GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef HW_POISON_H
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#error Must define HW_POISON_H to work around TARGET_* poisoning
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#endif
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#include "qemu/osdep.h"
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#include <math.h>
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#include <fenv.h>
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#include "qemu/timer.h"
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#include "fpu/softfloat.h"
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/* amortize the computation of random inputs */
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#define OPS_PER_ITER 50000
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#define MAX_OPERANDS 3
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#define SEED_A 0xdeadfacedeadface
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#define SEED_B 0xbadc0feebadc0fee
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#define SEED_C 0xbeefdeadbeefdead
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enum op {
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OP_ADD,
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OP_SUB,
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OP_MUL,
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OP_DIV,
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OP_FMA,
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OP_SQRT,
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OP_CMP,
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OP_MAX_NR,
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};
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static const char * const op_names[] = {
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[OP_ADD] = "add",
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[OP_SUB] = "sub",
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[OP_MUL] = "mul",
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[OP_DIV] = "div",
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[OP_FMA] = "mulAdd",
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[OP_SQRT] = "sqrt",
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[OP_CMP] = "cmp",
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[OP_MAX_NR] = NULL,
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};
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enum precision {
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PREC_SINGLE,
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PREC_DOUBLE,
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PREC_FLOAT32,
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PREC_FLOAT64,
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PREC_MAX_NR,
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};
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enum rounding {
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ROUND_EVEN,
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ROUND_ZERO,
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ROUND_DOWN,
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ROUND_UP,
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ROUND_TIEAWAY,
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N_ROUND_MODES,
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};
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static const char * const round_names[] = {
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[ROUND_EVEN] = "even",
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[ROUND_ZERO] = "zero",
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[ROUND_DOWN] = "down",
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[ROUND_UP] = "up",
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[ROUND_TIEAWAY] = "tieaway",
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};
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enum tester {
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TESTER_SOFT,
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TESTER_HOST,
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TESTER_MAX_NR,
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};
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static const char * const tester_names[] = {
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[TESTER_SOFT] = "soft",
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[TESTER_HOST] = "host",
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[TESTER_MAX_NR] = NULL,
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};
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union fp {
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float f;
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double d;
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float32 f32;
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float64 f64;
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uint64_t u64;
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};
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struct op_state;
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typedef float (*float_func_t)(const struct op_state *s);
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typedef double (*double_func_t)(const struct op_state *s);
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union fp_func {
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float_func_t float_func;
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double_func_t double_func;
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};
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typedef void (*bench_func_t)(void);
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struct op_desc {
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const char * const name;
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};
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#define DEFAULT_DURATION_SECS 1
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static uint64_t random_ops[MAX_OPERANDS] = {
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SEED_A, SEED_B, SEED_C,
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};
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static float_status soft_status;
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static enum precision precision;
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static enum op operation;
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static enum tester tester;
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static uint64_t n_completed_ops;
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static unsigned int duration = DEFAULT_DURATION_SECS;
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static int64_t ns_elapsed;
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/* disable optimizations with volatile */
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static volatile union fp res;
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/*
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* From: https://en.wikipedia.org/wiki/Xorshift
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* This is faster than rand_r(), and gives us a wider range (RAND_MAX is only
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* guaranteed to be >= INT_MAX).
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*/
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static uint64_t xorshift64star(uint64_t x)
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{
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x ^= x >> 12; /* a */
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x ^= x << 25; /* b */
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x ^= x >> 27; /* c */
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return x * UINT64_C(2685821657736338717);
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}
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static void update_random_ops(int n_ops, enum precision prec)
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{
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int i;
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for (i = 0; i < n_ops; i++) {
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uint64_t r = random_ops[i];
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switch (prec) {
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case PREC_SINGLE:
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case PREC_FLOAT32:
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do {
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r = xorshift64star(r);
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} while (!float32_is_normal(r));
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break;
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case PREC_DOUBLE:
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case PREC_FLOAT64:
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do {
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r = xorshift64star(r);
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} while (!float64_is_normal(r));
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break;
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default:
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g_assert_not_reached();
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}
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random_ops[i] = r;
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}
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}
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static void fill_random(union fp *ops, int n_ops, enum precision prec,
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bool no_neg)
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{
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int i;
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for (i = 0; i < n_ops; i++) {
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switch (prec) {
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case PREC_SINGLE:
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case PREC_FLOAT32:
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ops[i].f32 = make_float32(random_ops[i]);
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if (no_neg && float32_is_neg(ops[i].f32)) {
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ops[i].f32 = float32_chs(ops[i].f32);
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}
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break;
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case PREC_DOUBLE:
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case PREC_FLOAT64:
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ops[i].f64 = make_float64(random_ops[i]);
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if (no_neg && float64_is_neg(ops[i].f64)) {
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ops[i].f64 = float64_chs(ops[i].f64);
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}
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break;
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default:
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g_assert_not_reached();
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}
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}
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}
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/*
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* The main benchmark function. Instead of (ab)using macros, we rely
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* on the compiler to unfold this at compile-time.
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*/
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static void bench(enum precision prec, enum op op, int n_ops, bool no_neg)
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{
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int64_t tf = get_clock() + duration * 1000000000LL;
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while (get_clock() < tf) {
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union fp ops[MAX_OPERANDS];
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int64_t t0;
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int i;
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update_random_ops(n_ops, prec);
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switch (prec) {
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case PREC_SINGLE:
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fill_random(ops, n_ops, prec, no_neg);
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t0 = get_clock();
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for (i = 0; i < OPS_PER_ITER; i++) {
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float a = ops[0].f;
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float b = ops[1].f;
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float c = ops[2].f;
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switch (op) {
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case OP_ADD:
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res.f = a + b;
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break;
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case OP_SUB:
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res.f = a - b;
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break;
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case OP_MUL:
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res.f = a * b;
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break;
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case OP_DIV:
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res.f = a / b;
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break;
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case OP_FMA:
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res.f = fmaf(a, b, c);
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break;
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case OP_SQRT:
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res.f = sqrtf(a);
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break;
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case OP_CMP:
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res.u64 = isgreater(a, b);
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break;
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default:
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g_assert_not_reached();
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}
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}
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break;
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case PREC_DOUBLE:
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fill_random(ops, n_ops, prec, no_neg);
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t0 = get_clock();
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for (i = 0; i < OPS_PER_ITER; i++) {
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double a = ops[0].d;
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double b = ops[1].d;
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double c = ops[2].d;
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switch (op) {
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case OP_ADD:
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res.d = a + b;
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break;
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case OP_SUB:
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res.d = a - b;
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break;
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case OP_MUL:
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res.d = a * b;
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break;
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case OP_DIV:
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res.d = a / b;
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break;
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case OP_FMA:
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res.d = fma(a, b, c);
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break;
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case OP_SQRT:
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res.d = sqrt(a);
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break;
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case OP_CMP:
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res.u64 = isgreater(a, b);
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break;
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default:
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g_assert_not_reached();
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}
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}
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break;
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case PREC_FLOAT32:
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fill_random(ops, n_ops, prec, no_neg);
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t0 = get_clock();
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for (i = 0; i < OPS_PER_ITER; i++) {
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float32 a = ops[0].f32;
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float32 b = ops[1].f32;
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float32 c = ops[2].f32;
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switch (op) {
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case OP_ADD:
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res.f32 = float32_add(a, b, &soft_status);
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break;
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case OP_SUB:
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res.f32 = float32_sub(a, b, &soft_status);
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break;
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case OP_MUL:
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res.f = float32_mul(a, b, &soft_status);
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break;
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case OP_DIV:
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res.f32 = float32_div(a, b, &soft_status);
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break;
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case OP_FMA:
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res.f32 = float32_muladd(a, b, c, 0, &soft_status);
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break;
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case OP_SQRT:
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res.f32 = float32_sqrt(a, &soft_status);
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break;
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case OP_CMP:
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res.u64 = float32_compare_quiet(a, b, &soft_status);
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break;
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default:
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g_assert_not_reached();
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}
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}
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break;
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case PREC_FLOAT64:
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fill_random(ops, n_ops, prec, no_neg);
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t0 = get_clock();
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for (i = 0; i < OPS_PER_ITER; i++) {
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float64 a = ops[0].f64;
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float64 b = ops[1].f64;
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float64 c = ops[2].f64;
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switch (op) {
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case OP_ADD:
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res.f64 = float64_add(a, b, &soft_status);
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break;
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case OP_SUB:
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res.f64 = float64_sub(a, b, &soft_status);
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break;
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case OP_MUL:
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res.f = float64_mul(a, b, &soft_status);
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break;
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case OP_DIV:
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res.f64 = float64_div(a, b, &soft_status);
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break;
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case OP_FMA:
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res.f64 = float64_muladd(a, b, c, 0, &soft_status);
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break;
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case OP_SQRT:
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res.f64 = float64_sqrt(a, &soft_status);
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break;
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case OP_CMP:
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res.u64 = float64_compare_quiet(a, b, &soft_status);
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break;
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default:
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g_assert_not_reached();
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}
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}
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break;
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default:
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g_assert_not_reached();
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}
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ns_elapsed += get_clock() - t0;
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n_completed_ops += OPS_PER_ITER;
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}
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}
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#define GEN_BENCH(name, type, prec, op, n_ops) \
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static void __attribute__((flatten)) name(void) \
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{ \
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bench(prec, op, n_ops, false); \
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}
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#define GEN_BENCH_NO_NEG(name, type, prec, op, n_ops) \
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static void __attribute__((flatten)) name(void) \
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{ \
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bench(prec, op, n_ops, true); \
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}
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#define GEN_BENCH_ALL_TYPES(opname, op, n_ops) \
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GEN_BENCH(bench_ ## opname ## _float, float, PREC_SINGLE, op, n_ops) \
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GEN_BENCH(bench_ ## opname ## _double, double, PREC_DOUBLE, op, n_ops) \
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GEN_BENCH(bench_ ## opname ## _float32, float32, PREC_FLOAT32, op, n_ops) \
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GEN_BENCH(bench_ ## opname ## _float64, float64, PREC_FLOAT64, op, n_ops)
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GEN_BENCH_ALL_TYPES(add, OP_ADD, 2)
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GEN_BENCH_ALL_TYPES(sub, OP_SUB, 2)
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GEN_BENCH_ALL_TYPES(mul, OP_MUL, 2)
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GEN_BENCH_ALL_TYPES(div, OP_DIV, 2)
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GEN_BENCH_ALL_TYPES(fma, OP_FMA, 3)
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GEN_BENCH_ALL_TYPES(cmp, OP_CMP, 2)
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#undef GEN_BENCH_ALL_TYPES
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#define GEN_BENCH_ALL_TYPES_NO_NEG(name, op, n) \
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GEN_BENCH_NO_NEG(bench_ ## name ## _float, float, PREC_SINGLE, op, n) \
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GEN_BENCH_NO_NEG(bench_ ## name ## _double, double, PREC_DOUBLE, op, n) \
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GEN_BENCH_NO_NEG(bench_ ## name ## _float32, float32, PREC_FLOAT32, op, n) \
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GEN_BENCH_NO_NEG(bench_ ## name ## _float64, float64, PREC_FLOAT64, op, n)
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GEN_BENCH_ALL_TYPES_NO_NEG(sqrt, OP_SQRT, 1)
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#undef GEN_BENCH_ALL_TYPES_NO_NEG
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#undef GEN_BENCH_NO_NEG
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#undef GEN_BENCH
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#define GEN_BENCH_FUNCS(opname, op) \
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[op] = { \
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[PREC_SINGLE] = bench_ ## opname ## _float, \
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[PREC_DOUBLE] = bench_ ## opname ## _double, \
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[PREC_FLOAT32] = bench_ ## opname ## _float32, \
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[PREC_FLOAT64] = bench_ ## opname ## _float64, \
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}
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static const bench_func_t bench_funcs[OP_MAX_NR][PREC_MAX_NR] = {
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GEN_BENCH_FUNCS(add, OP_ADD),
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GEN_BENCH_FUNCS(sub, OP_SUB),
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GEN_BENCH_FUNCS(mul, OP_MUL),
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GEN_BENCH_FUNCS(div, OP_DIV),
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GEN_BENCH_FUNCS(fma, OP_FMA),
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GEN_BENCH_FUNCS(sqrt, OP_SQRT),
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GEN_BENCH_FUNCS(cmp, OP_CMP),
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};
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#undef GEN_BENCH_FUNCS
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static void run_bench(void)
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{
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bench_func_t f;
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f = bench_funcs[operation][precision];
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g_assert(f);
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f();
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}
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/* @arr must be NULL-terminated */
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static int find_name(const char * const *arr, const char *name)
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{
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int i;
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for (i = 0; arr[i] != NULL; i++) {
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if (strcmp(name, arr[i]) == 0) {
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return i;
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}
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}
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return -1;
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}
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static void usage_complete(int argc, char *argv[])
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{
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gchar *op_list = g_strjoinv(", ", (gchar **)op_names);
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gchar *tester_list = g_strjoinv(", ", (gchar **)tester_names);
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fprintf(stderr, "Usage: %s [options]\n", argv[0]);
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fprintf(stderr, "options:\n");
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fprintf(stderr, " -d = duration, in seconds. Default: %d\n",
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DEFAULT_DURATION_SECS);
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fprintf(stderr, " -h = show this help message.\n");
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fprintf(stderr, " -o = floating point operation (%s). Default: %s\n",
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op_list, op_names[0]);
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fprintf(stderr, " -p = floating point precision (single, double). "
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"Default: single\n");
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fprintf(stderr, " -r = rounding mode (even, zero, down, up, tieaway). "
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"Default: even\n");
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fprintf(stderr, " -t = tester (%s). Default: %s\n",
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tester_list, tester_names[0]);
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fprintf(stderr, " -z = flush inputs to zero (soft tester only). "
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"Default: disabled\n");
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fprintf(stderr, " -Z = flush output to zero (soft tester only). "
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"Default: disabled\n");
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g_free(tester_list);
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g_free(op_list);
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}
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static int round_name_to_mode(const char *name)
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{
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int i;
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for (i = 0; i < N_ROUND_MODES; i++) {
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if (!strcmp(round_names[i], name)) {
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return i;
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}
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}
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return -1;
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}
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static void QEMU_NORETURN die_host_rounding(enum rounding rounding)
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{
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fprintf(stderr, "fatal: '%s' rounding not supported on this host\n",
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round_names[rounding]);
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exit(EXIT_FAILURE);
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}
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static void set_host_precision(enum rounding rounding)
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{
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int rhost;
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switch (rounding) {
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case ROUND_EVEN:
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rhost = FE_TONEAREST;
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break;
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case ROUND_ZERO:
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rhost = FE_TOWARDZERO;
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break;
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case ROUND_DOWN:
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rhost = FE_DOWNWARD;
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break;
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case ROUND_UP:
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rhost = FE_UPWARD;
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break;
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case ROUND_TIEAWAY:
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die_host_rounding(rounding);
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return;
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default:
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g_assert_not_reached();
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}
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if (fesetround(rhost)) {
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die_host_rounding(rounding);
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}
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}
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static void set_soft_precision(enum rounding rounding)
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{
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signed char mode;
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switch (rounding) {
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case ROUND_EVEN:
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mode = float_round_nearest_even;
|
|
break;
|
|
case ROUND_ZERO:
|
|
mode = float_round_to_zero;
|
|
break;
|
|
case ROUND_DOWN:
|
|
mode = float_round_down;
|
|
break;
|
|
case ROUND_UP:
|
|
mode = float_round_up;
|
|
break;
|
|
case ROUND_TIEAWAY:
|
|
mode = float_round_ties_away;
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
soft_status.float_rounding_mode = mode;
|
|
}
|
|
|
|
static void parse_args(int argc, char *argv[])
|
|
{
|
|
int c;
|
|
int val;
|
|
int rounding = ROUND_EVEN;
|
|
|
|
for (;;) {
|
|
c = getopt(argc, argv, "d:ho:p:r:t:zZ");
|
|
if (c < 0) {
|
|
break;
|
|
}
|
|
switch (c) {
|
|
case 'd':
|
|
duration = atoi(optarg);
|
|
break;
|
|
case 'h':
|
|
usage_complete(argc, argv);
|
|
exit(EXIT_SUCCESS);
|
|
case 'o':
|
|
val = find_name(op_names, optarg);
|
|
if (val < 0) {
|
|
fprintf(stderr, "Unsupported op '%s'\n", optarg);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
operation = val;
|
|
break;
|
|
case 'p':
|
|
if (!strcmp(optarg, "single")) {
|
|
precision = PREC_SINGLE;
|
|
} else if (!strcmp(optarg, "double")) {
|
|
precision = PREC_DOUBLE;
|
|
} else {
|
|
fprintf(stderr, "Unsupported precision '%s'\n", optarg);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
break;
|
|
case 'r':
|
|
rounding = round_name_to_mode(optarg);
|
|
if (rounding < 0) {
|
|
fprintf(stderr, "fatal: invalid rounding mode '%s'\n", optarg);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
break;
|
|
case 't':
|
|
val = find_name(tester_names, optarg);
|
|
if (val < 0) {
|
|
fprintf(stderr, "Unsupported tester '%s'\n", optarg);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
tester = val;
|
|
break;
|
|
case 'z':
|
|
soft_status.flush_inputs_to_zero = 1;
|
|
break;
|
|
case 'Z':
|
|
soft_status.flush_to_zero = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* set precision and rounding mode based on the tester */
|
|
switch (tester) {
|
|
case TESTER_HOST:
|
|
set_host_precision(rounding);
|
|
break;
|
|
case TESTER_SOFT:
|
|
set_soft_precision(rounding);
|
|
switch (precision) {
|
|
case PREC_SINGLE:
|
|
precision = PREC_FLOAT32;
|
|
break;
|
|
case PREC_DOUBLE:
|
|
precision = PREC_FLOAT64;
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
|
|
static void pr_stats(void)
|
|
{
|
|
printf("%.2f MFlops\n", (double)n_completed_ops / ns_elapsed * 1e3);
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
parse_args(argc, argv);
|
|
run_bench();
|
|
pr_stats();
|
|
return 0;
|
|
}
|