#define _GNU_SOURCE #include <fenv.h> #include <stdbool.h> #include <stdio.h> #include <string.h> /* * vfmin/vfmax instruction execution. */ #define VFMIN 0xEE #define VFMAX 0xEF extern char insn[6]; asm(".pushsection .rwx,\"awx\",@progbits\n" ".globl insn\n" /* e7 89 a0 00 2e ef */ "insn: vfmaxsb %v24,%v25,%v26,0\n" ".popsection\n"); static void vfminmax(unsigned int op, unsigned int m4, unsigned int m5, unsigned int m6, void *v1, const void *v2, const void *v3) { insn[3] = (m6 << 4) | m5; insn[4] = (m4 << 4) | 0x0e; insn[5] = op; asm("vl %%v25,%[v2]\n" "vl %%v26,%[v3]\n" "ex 0,%[insn]\n" "vst %%v24,%[v1]\n" : [v1] "=m" (*(char (*)[16])v1) : [v2] "m" (*(char (*)[16])v2) , [v3] "m" (*(char (*)[16])v3) , [insn] "m"(insn) : "v24", "v25", "v26"); } /* * Floating-point value classes. */ #define N_FORMATS 3 #define N_SIGNED_CLASSES 8 static const size_t float_sizes[N_FORMATS] = { /* M4 == 2: short */ 4, /* M4 == 3: long */ 8, /* M4 == 4: extended */ 16, }; static const size_t e_bits[N_FORMATS] = { /* M4 == 2: short */ 8, /* M4 == 3: long */ 11, /* M4 == 4: extended */ 15, }; static const unsigned char signed_floats[N_FORMATS][N_SIGNED_CLASSES][2][16] = { /* M4 == 2: short */ { /* -inf */ {{0xff, 0x80, 0x00, 0x00}, {0xff, 0x80, 0x00, 0x00}}, /* -Fn */ {{0xc2, 0x28, 0x00, 0x00}, {0xc2, 0x29, 0x00, 0x00}}, /* -0 */ {{0x80, 0x00, 0x00, 0x00}, {0x80, 0x00, 0x00, 0x00}}, /* +0 */ {{0x00, 0x00, 0x00, 0x00}, {0x00, 0x00, 0x00, 0x00}}, /* +Fn */ {{0x42, 0x28, 0x00, 0x00}, {0x42, 0x2a, 0x00, 0x00}}, /* +inf */ {{0x7f, 0x80, 0x00, 0x00}, {0x7f, 0x80, 0x00, 0x00}}, /* QNaN */ {{0x7f, 0xff, 0xff, 0xff}, {0x7f, 0xff, 0xff, 0xfe}}, /* SNaN */ {{0x7f, 0xbf, 0xff, 0xff}, {0x7f, 0xbf, 0xff, 0xfd}}, }, /* M4 == 3: long */ { /* -inf */ {{0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* -Fn */ {{0xc0, 0x45, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0xc0, 0x46, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* -0 */ {{0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* +0 */ {{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* +Fn */ {{0x40, 0x45, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0x40, 0x47, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* +inf */ {{0x7f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0x7f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* QNaN */ {{0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, {0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}}, /* SNaN */ {{0x7f, 0xf7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, {0x7f, 0xf7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfd}}, }, /* M4 == 4: extended */ { /* -inf */ {{0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* -Fn */ {{0xc0, 0x04, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0xc0, 0x04, 0x51, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* -0 */ {{0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* +0 */ {{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* +Fn */ {{0x40, 0x04, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0x40, 0x04, 0x52, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* +inf */ {{0x7f, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, {0x7f, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}, /* QNaN */ {{0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, {0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}}, /* SNaN */ {{0x7f, 0xff, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, {0x7f, 0xff, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfd}}, }, }; /* * PoP tables as close to the original as possible. */ struct signed_test { int op; int m6; const char *m6_desc; const char *table[N_SIGNED_CLASSES][N_SIGNED_CLASSES]; } signed_tests[] = { { .op = VFMIN, .m6 = 0, .m6_desc = "IEEE MinNum", .table = { /* -inf -Fn -0 +0 +Fn +inf QNaN SNaN */ {/* -inf */ "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(b*)"}, {/* -Fn */ "T(b)", "T(M(a,b))", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(b*)"}, {/* -0 */ "T(b)", "T(b)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(b*)"}, {/* +0 */ "T(b)", "T(b)", "T(b)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(b*)"}, {/* +Fn */ "T(b)", "T(b)", "T(b)", "T(b)", "T(M(a,b))", "T(a)", "T(a)", "Xi: T(b*)"}, {/* +inf */ "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "T(a)", "Xi: T(b*)"}, {/* QNaN */ "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(b*)"}, {/* SNaN */ "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)"}, }, }, { .op = VFMIN, .m6 = 1, .m6_desc = "JAVA Math.Min()", .table = { /* -inf -Fn -0 +0 +Fn +inf QNaN SNaN */ {/* -inf */ "T(b)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(b)", "Xi: T(b*)"}, {/* -Fn */ "T(b)", "T(M(a,b))", "T(a)", "T(a)", "T(a)", "T(a)", "T(b)", "Xi: T(b*)"}, {/* -0 */ "T(b)", "T(b)", "T(b)", "T(a)", "T(a)", "T(a)", "T(b)", "Xi: T(b*)"}, {/* +0 */ "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "T(a)", "T(b)", "Xi: T(b*)"}, {/* +Fn */ "T(b)", "T(b)", "T(b)", "T(b)", "T(M(a,b))", "T(a)", "T(b)", "Xi: T(b*)"}, {/* +inf */ "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "Xi: T(b*)"}, {/* QNaN */ "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(b*)"}, {/* SNaN */ "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)"}, }, }, { .op = VFMIN, .m6 = 2, .m6_desc = "C-style Min Macro", .table = { /* -inf -Fn -0 +0 +Fn +inf QNaN SNaN */ {/* -inf */ "T(b)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(b)", "Xi: T(b)"}, {/* -Fn */ "T(b)", "T(M(a,b))", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(b)", "Xi: T(b)"}, {/* -0 */ "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "T(a)", "Xi: T(b)", "Xi: T(b)"}, {/* +0 */ "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "T(a)", "Xi: T(b)", "Xi: T(b)"}, {/* +Fn */ "T(b)", "T(b)", "T(b)", "T(b)", "T(M(a,b))", "T(a)", "Xi: T(b)", "Xi: T(b)"}, {/* +inf */ "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(b)", "Xi: T(b)"}, {/* QNaN */ "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)"}, {/* SNaN */ "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)"}, }, }, { .op = VFMIN, .m6 = 3, .m6_desc = "C++ algorithm.min()", .table = { /* -inf -Fn -0 +0 +Fn +inf QNaN SNaN */ {/* -inf */ "T(b)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(a)", "Xi: T(a)"}, {/* -Fn */ "T(b)", "T(M(a,b))", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(a)", "Xi: T(a)"}, {/* -0 */ "T(b)", "T(b)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(a)", "Xi: T(a)"}, {/* +0 */ "T(b)", "T(b)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(a)", "Xi: T(a)"}, {/* +Fn */ "T(b)", "T(b)", "T(b)", "T(b)", "T(M(a,b))", "T(a)", "Xi: T(a)", "Xi: T(a)"}, {/* +inf */ "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(a)", "Xi: T(a)"}, {/* QNaN */ "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)"}, {/* SNaN */ "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)"}, }, }, { .op = VFMIN, .m6 = 4, .m6_desc = "fmin()", .table = { /* -inf -Fn -0 +0 +Fn +inf QNaN SNaN */ {/* -inf */ "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(a)"}, {/* -Fn */ "T(b)", "T(M(a,b))", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(a)"}, {/* -0 */ "T(b)", "T(b)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(a)"}, {/* +0 */ "T(b)", "T(b)", "T(b)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(a)"}, {/* +Fn */ "T(b)", "T(b)", "T(b)", "T(b)", "T(M(a,b))", "T(a)", "T(a)", "Xi: T(a)"}, {/* +inf */ "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "T(a)", "Xi: T(a)"}, {/* QNaN */ "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(a)"}, {/* SNaN */ "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(a)", "Xi: T(a)"}, }, }, { .op = VFMAX, .m6 = 0, .m6_desc = "IEEE MaxNum", .table = { /* -inf -Fn -0 +0 +Fn +inf QNaN SNaN */ {/* -inf */ "T(a)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(b*)"}, {/* -Fn */ "T(a)", "T(M(a,b))", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(b*)"}, {/* -0 */ "T(a)", "T(a)", "T(a)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(b*)"}, {/* +0 */ "T(a)", "T(a)", "T(a)", "T(a)", "T(b)", "T(b)", "T(a)", "Xi: T(b*)"}, {/* +Fn */ "T(a)", "T(a)", "T(a)", "T(a)", "T(M(a,b))", "T(b)", "T(a)", "Xi: T(b*)"}, {/* +inf */ "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(b*)"}, {/* QNaN */ "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(b*)"}, {/* SNaN */ "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)"}, }, }, { .op = VFMAX, .m6 = 1, .m6_desc = "JAVA Math.Max()", .table = { /* -inf -Fn -0 +0 +Fn +inf QNaN SNaN */ {/* -inf */ "T(a)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "Xi: T(b*)"}, {/* -Fn */ "T(a)", "T(M(a,b))", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "Xi: T(b*)"}, {/* -0 */ "T(a)", "T(a)", "T(a)", "T(b)", "T(b)", "T(b)", "T(b)", "Xi: T(b*)"}, {/* +0 */ "T(a)", "T(a)", "T(a)", "T(a)", "T(b)", "T(b)", "T(b)", "Xi: T(b*)"}, {/* +Fn */ "T(a)", "T(a)", "T(a)", "T(a)", "T(M(a,b))", "T(b)", "T(b)", "Xi: T(b*)"}, {/* +inf */ "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(b)", "Xi: T(b*)"}, {/* QNaN */ "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(b*)"}, {/* SNaN */ "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)", "Xi: T(a*)"}, }, }, { .op = VFMAX, .m6 = 2, .m6_desc = "C-style Max Macro", .table = { /* -inf -Fn -0 +0 +Fn +inf QNaN SNaN */ {/* -inf */ "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "Xi: T(b)", "Xi: T(b)"}, {/* -Fn */ "T(a)", "T(M(a,b))", "T(b)", "T(b)", "T(b)", "T(b)", "Xi: T(b)", "Xi: T(b)"}, {/* -0 */ "T(a)", "T(a)", "T(b)", "T(b)", "T(b)", "T(b)", "Xi: T(b)", "Xi: T(b)"}, {/* +0 */ "T(a)", "T(a)", "T(b)", "T(b)", "T(b)", "T(b)", "Xi: T(b)", "Xi: T(b)"}, {/* +Fn */ "T(a)", "T(a)", "T(a)", "T(a)", "T(M(a,b))", "T(b)", "Xi: T(b)", "Xi: T(b)"}, {/* +inf */ "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(b)", "Xi: T(b)", "Xi: T(b)"}, {/* QNaN */ "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)"}, {/* SNaN */ "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)"}, }, }, { .op = VFMAX, .m6 = 3, .m6_desc = "C++ algorithm.max()", .table = { /* -inf -Fn -0 +0 +Fn +inf QNaN SNaN */ {/* -inf */ "T(a)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "Xi: T(a)", "Xi: T(a)"}, {/* -Fn */ "T(a)", "T(M(a,b))", "T(b)", "T(b)", "T(b)", "T(b)", "Xi: T(a)", "Xi: T(a)"}, {/* -0 */ "T(a)", "T(a)", "T(a)", "T(a)", "T(b)", "T(b)", "Xi: T(a)", "Xi: T(a)"}, {/* +0 */ "T(a)", "T(a)", "T(a)", "T(a)", "T(b)", "T(b)", "Xi: T(a)", "Xi: T(a)"}, {/* +Fn */ "T(a)", "T(a)", "T(a)", "T(a)", "T(M(a,b))", "T(b)", "Xi: T(a)", "Xi: T(a)"}, {/* +inf */ "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(a)", "Xi: T(a)"}, {/* QNaN */ "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)"}, {/* SNaN */ "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)", "Xi: T(a)"}, }, }, { .op = VFMAX, .m6 = 4, .m6_desc = "fmax()", .table = { /* -inf -Fn -0 +0 +Fn +inf QNaN SNaN */ {/* -inf */ "T(a)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(a)"}, {/* -Fn */ "T(a)", "T(M(a,b))", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(a)"}, {/* -0 */ "T(a)", "T(a)", "T(a)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(a)"}, {/* +0 */ "T(a)", "T(a)", "T(a)", "T(a)", "T(b)", "T(b)", "T(a)", "Xi: T(a)"}, {/* +Fn */ "T(a)", "T(a)", "T(a)", "T(a)", "T(M(a,b))", "T(b)", "T(a)", "Xi: T(a)"}, {/* +inf */ "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "T(a)", "Xi: T(a)"}, {/* QNaN */ "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(b)", "T(a)", "Xi: T(a)"}, {/* SNaN */ "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(b)", "Xi: T(a)", "Xi: T(a)"}, }, }, }; static void dump_v(FILE *f, const void *v, size_t n) { for (int i = 0; i < n; i++) { fprintf(f, "%02x", ((const unsigned char *)v)[i]); } } static int signed_test(struct signed_test *test, int m4, int m5, const void *v1_exp, bool xi_exp, const void *v2, const void *v3) { size_t n = (m5 & 8) ? float_sizes[m4 - 2] : 16; char v1[16]; bool xi; feclearexcept(FE_ALL_EXCEPT); vfminmax(test->op, m4, m5, test->m6, v1, v2, v3); xi = fetestexcept(FE_ALL_EXCEPT) == FE_INVALID; if (memcmp(v1, v1_exp, n) != 0 || xi != xi_exp) { fprintf(stderr, "[ FAILED ] %s ", test->m6_desc); dump_v(stderr, v2, n); fprintf(stderr, ", "); dump_v(stderr, v3, n); fprintf(stderr, ", %d, %d, %d: actual=", m4, m5, test->m6); dump_v(stderr, v1, n); fprintf(stderr, "/%d, expected=", (int)xi); dump_v(stderr, v1_exp, n); fprintf(stderr, "/%d\n", (int)xi_exp); return 1; } return 0; } static void snan_to_qnan(char *v, int m4) { size_t bit = 1 + e_bits[m4 - 2]; v[bit / 8] |= 1 << (7 - (bit % 8)); } int main(void) { int ret = 0; size_t i; for (i = 0; i < sizeof(signed_tests) / sizeof(signed_tests[0]); i++) { struct signed_test *test = &signed_tests[i]; int m4; for (m4 = 2; m4 <= 4; m4++) { const unsigned char (*floats)[2][16] = signed_floats[m4 - 2]; size_t float_size = float_sizes[m4 - 2]; int m5; for (m5 = 0; m5 <= 8; m5 += 8) { char v1_exp[16], v2[16], v3[16]; bool xi_exp = false; int pos = 0; int i2; for (i2 = 0; i2 < N_SIGNED_CLASSES * 2; i2++) { int i3; for (i3 = 0; i3 < N_SIGNED_CLASSES * 2; i3++) { const char *spec = test->table[i2 / 2][i3 / 2]; memcpy(&v2[pos], floats[i2 / 2][i2 % 2], float_size); memcpy(&v3[pos], floats[i3 / 2][i3 % 2], float_size); if (strcmp(spec, "T(a)") == 0 || strcmp(spec, "Xi: T(a)") == 0) { memcpy(&v1_exp[pos], &v2[pos], float_size); } else if (strcmp(spec, "T(b)") == 0 || strcmp(spec, "Xi: T(b)") == 0) { memcpy(&v1_exp[pos], &v3[pos], float_size); } else if (strcmp(spec, "Xi: T(a*)") == 0) { memcpy(&v1_exp[pos], &v2[pos], float_size); snan_to_qnan(&v1_exp[pos], m4); } else if (strcmp(spec, "Xi: T(b*)") == 0) { memcpy(&v1_exp[pos], &v3[pos], float_size); snan_to_qnan(&v1_exp[pos], m4); } else if (strcmp(spec, "T(M(a,b))") == 0) { /* * Comparing floats is risky, since the compiler * might generate the same instruction that we are * testing. Compare ints instead. This works, * because we get here only for +-Fn, and the * corresponding test values have identical * exponents. */ int v2_int = *(int *)&v2[pos]; int v3_int = *(int *)&v3[pos]; if ((v2_int < v3_int) == ((test->op == VFMIN) != (v2_int < 0))) { memcpy(&v1_exp[pos], &v2[pos], float_size); } else { memcpy(&v1_exp[pos], &v3[pos], float_size); } } else { fprintf(stderr, "Unexpected spec: %s\n", spec); return 1; } xi_exp |= spec[0] == 'X'; pos += float_size; if ((m5 & 8) || pos == 16) { ret |= signed_test(test, m4, m5, v1_exp, xi_exp, v2, v3); pos = 0; xi_exp = false; } } } if (pos != 0) { ret |= signed_test(test, m4, m5, v1_exp, xi_exp, v2, v3); } } } } return ret; }