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tcg/i386: Add tcg_out_evex_opc

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The evex encoding is added here, for use in a subsequent patch.

Tested-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-12-15 20:43:00 -08:00
parent ba597b66d9
commit 08b032f791
1 changed files with 50 additions and 1 deletions
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51
tcg/i386/tcg-target.c.inc
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@ -262,6 +262,7 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
#define P_SIMDF3 0x20000 /* 0xf3 opcode prefix */
#define P_SIMDF2 0x40000 /* 0xf2 opcode prefix */
#define P_VEXL 0x80000 /* Set VEX.L = 1 */
#define P_EVEX 0x100000 /* Requires EVEX encoding */
#define OPC_ARITH_EvIz (0x81)
#define OPC_ARITH_EvIb (0x83)
@ -626,9 +627,57 @@ static void tcg_out_vex_opc(TCGContext *s, int opc, int r, int v,
tcg_out8(s, opc);
}
static void tcg_out_evex_opc(TCGContext *s, int opc, int r, int v,
int rm, int index)
{
/* The entire 4-byte evex prefix; with R' and V' set. */
uint32_t p = 0x08041062;
int mm, pp;
tcg_debug_assert(have_avx512vl);
/* EVEX.mm */
if (opc & P_EXT3A) {
mm = 3;
} else if (opc & P_EXT38) {
mm = 2;
} else if (opc & P_EXT) {
mm = 1;
} else {
g_assert_not_reached();
}
/* EVEX.pp */
if (opc & P_DATA16) {
pp = 1; /* 0x66 */
} else if (opc & P_SIMDF3) {
pp = 2; /* 0xf3 */
} else if (opc & P_SIMDF2) {
pp = 3; /* 0xf2 */
} else {
pp = 0;
}
p = deposit32(p, 8, 2, mm);
p = deposit32(p, 13, 1, (rm & 8) == 0); /* EVEX.RXB.B */
p = deposit32(p, 14, 1, (index & 8) == 0); /* EVEX.RXB.X */
p = deposit32(p, 15, 1, (r & 8) == 0); /* EVEX.RXB.R */
p = deposit32(p, 16, 2, pp);
p = deposit32(p, 19, 4, ~v);
p = deposit32(p, 23, 1, (opc & P_VEXW) != 0);
p = deposit32(p, 29, 2, (opc & P_VEXL) != 0);
tcg_out32(s, p);
tcg_out8(s, opc);
}
static void tcg_out_vex_modrm(TCGContext *s, int opc, int r, int v, int rm)
{
tcg_out_vex_opc(s, opc, r, v, rm, 0);
if (opc & P_EVEX) {
tcg_out_evex_opc(s, opc, r, v, rm, 0);
} else {
tcg_out_vex_opc(s, opc, r, v, rm, 0);
}
tcg_out8(s, 0xc0 | (LOWREGMASK(r) << 3) | LOWREGMASK(rm));
}