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tcg/i386: Split P_VEXW from P_REXW 

We need to be able to represent VEX.W on a 32-bit host, where REX.W
will always be zero.  Fixes the encoding for VPSLLVQ and VPSRLVQ.

Fixes: a2ce146a06 ("tcg/i386: Support vector variable shift opcodes")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/385
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Richard Henderson 2021-08-10 16:17:04 -07:00
parent f025692c99
commit fc88a52318
1 changed files with 7 additions and 6 deletions
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13
tcg/i386/tcg-target.c.inc
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@ -241,8 +241,9 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
#define P_EXT 0x100 /* 0x0f opcode prefix */
#define P_EXT38 0x200 /* 0x0f 0x38 opcode prefix */
#define P_DATA16 0x400 /* 0x66 opcode prefix */
#define P_VEXW 0x1000 /* Set VEX.W = 1 */
#if TCG_TARGET_REG_BITS == 64
# define P_REXW 0x1000 /* Set REX.W = 1 */
# define P_REXW P_VEXW /* Set REX.W = 1; match VEXW */
# define P_REXB_R 0x2000 /* REG field as byte register */
# define P_REXB_RM 0x4000 /* R/M field as byte register */
# define P_GS 0x8000 /* gs segment override */
@ -410,13 +411,13 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
#define OPC_VPBROADCASTW (0x79 | P_EXT38 | P_DATA16)
#define OPC_VPBROADCASTD (0x58 | P_EXT38 | P_DATA16)
#define OPC_VPBROADCASTQ (0x59 | P_EXT38 | P_DATA16)
#define OPC_VPERMQ (0x00 | P_EXT3A | P_DATA16 | P_REXW)
#define OPC_VPERMQ (0x00 | P_EXT3A | P_DATA16 | P_VEXW)
#define OPC_VPERM2I128 (0x46 | P_EXT3A | P_DATA16 | P_VEXL)
#define OPC_VPSLLVD (0x47 | P_EXT38 | P_DATA16)
#define OPC_VPSLLVQ (0x47 | P_EXT38 | P_DATA16 | P_REXW)
#define OPC_VPSLLVQ (0x47 | P_EXT38 | P_DATA16 | P_VEXW)
#define OPC_VPSRAVD (0x46 | P_EXT38 | P_DATA16)
#define OPC_VPSRLVD (0x45 | P_EXT38 | P_DATA16)
#define OPC_VPSRLVQ (0x45 | P_EXT38 | P_DATA16 | P_REXW)
#define OPC_VPSRLVQ (0x45 | P_EXT38 | P_DATA16 | P_VEXW)
#define OPC_VZEROUPPER (0x77 | P_EXT)
#define OPC_XCHG_ax_r32 (0x90)
@ -576,7 +577,7 @@ static void tcg_out_vex_opc(TCGContext *s, int opc, int r, int v,
/* Use the two byte form if possible, which cannot encode
VEX.W, VEX.B, VEX.X, or an m-mmmm field other than P_EXT. */
if ((opc & (P_EXT | P_EXT38 | P_EXT3A | P_REXW)) == P_EXT
if ((opc & (P_EXT | P_EXT38 | P_EXT3A | P_VEXW)) == P_EXT
&& ((rm | index) & 8) == 0) {
/* Two byte VEX prefix. */
tcg_out8(s, 0xc5);
@ -601,7 +602,7 @@ static void tcg_out_vex_opc(TCGContext *s, int opc, int r, int v,
tmp |= (rm & 8 ? 0 : 0x20); /* VEX.B */
tcg_out8(s, tmp);
tmp = (opc & P_REXW ? 0x80 : 0); /* VEX.W */
tmp = (opc & P_VEXW ? 0x80 : 0); /* VEX.W */
}
tmp |= (opc & P_VEXL ? 0x04 : 0); /* VEX.L */