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host/i386: assume presence of CMOV

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QEMU now requires an x86-64-v2 host, which always has CMOV.
Use it freely in TCG generated code.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-05-31 10:14:48 +02:00
parent 294ac64e45
commit e68e97ce55
3 changed files with 1 additions and 16 deletions
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1
host/include/i386/host/cpuinfo.h
View File

@ -9,7 +9,6 @@
/* Digested version of <cpuid.h> */
#define CPUINFO_ALWAYS (1u << 0) /* so cpuinfo is nonzero */
#define CPUINFO_CMOV (1u << 1)
#define CPUINFO_MOVBE (1u << 2)
#define CPUINFO_LZCNT (1u << 3)
#define CPUINFO_POPCNT (1u << 4)

15
tcg/i386/tcg-target.c.inc
View File

@ -157,12 +157,6 @@ static TCGReg tcg_target_call_oarg_reg(TCGCallReturnKind kind, int slot)
#define SOFTMMU_RESERVE_REGS \
(tcg_use_softmmu ? (1 << TCG_REG_L0) | (1 << TCG_REG_L1) : 0)
/* For 64-bit, we always know that CMOV is available. */
#if TCG_TARGET_REG_BITS == 64
# define have_cmov true
#else
# define have_cmov (cpuinfo & CPUINFO_CMOV)
#endif
#define have_bmi2 (cpuinfo & CPUINFO_BMI2)
#define have_lzcnt (cpuinfo & CPUINFO_LZCNT)
@ -1815,14 +1809,7 @@ static void tcg_out_setcond2(TCGContext *s, const TCGArg *args,
static void tcg_out_cmov(TCGContext *s, int jcc, int rexw,
TCGReg dest, TCGReg v1)
{
if (have_cmov) {
tcg_out_modrm(s, OPC_CMOVCC | jcc | rexw, dest, v1);
} else {
TCGLabel *over = gen_new_label();
tcg_out_jxx(s, jcc ^ 1, over, 1);
tcg_out_mov(s, TCG_TYPE_I32, dest, v1);
tcg_out_label(s, over);
}
tcg_out_modrm(s, OPC_CMOVCC | jcc | rexw, dest, v1);
}
static void tcg_out_movcond(TCGContext *s, int rexw, TCGCond cond,

1
util/cpuinfo-i386.c
View File

@ -34,7 +34,6 @@ unsigned __attribute__((constructor)) cpuinfo_init(void)
if (max >= 1) {
__cpuid(1, a, b, c, d);
info |= (d & bit_CMOV ? CPUINFO_CMOV : 0);
info |= (d & bit_SSE2 ? CPUINFO_SSE2 : 0);
info |= (c & bit_MOVBE ? CPUINFO_MOVBE : 0);
info |= (c & bit_POPCNT ? CPUINFO_POPCNT : 0);