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tcg/i386: Always use %ebp for TCG_AREG0

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For x86_64, this can remove a REX prefix resulting in smaller code
when manipulating globals of type i32, as we move them between backing
store via cpu_env, aka TCG_AREG0.

Backports commit 5740d9f714835964873325d1210b26811252843f from qemu
This commit is contained in:
Richard Henderson 2018-12-18 05:13:04 -05:00 committed by Lioncash
parent 7ab51fc012
commit f3a8a4a306
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 6 deletions
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8
qemu/tcg/i386/tcg-target.h
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@ -84,6 +84,8 @@ typedef enum {
TCG_REG_RBP = TCG_REG_EBP,
TCG_REG_RSI = TCG_REG_ESI,
TCG_REG_RDI = TCG_REG_EDI,
TCG_AREG0 = TCG_REG_EBP,
} TCGReg;
/* used for function call generation */
@ -227,12 +229,6 @@ extern bool have_avx2;
#define TCG_TARGET_extract_i64_valid(ofs, len) \
(((ofs) == 8 && (len) == 8) || ((ofs) + (len)) == 32)
#if TCG_TARGET_REG_BITS == 64
# define TCG_AREG0 TCG_REG_R14
#else
# define TCG_AREG0 TCG_REG_EBP
#endif
static inline void flush_icache_range(uintptr_t start, uintptr_t stop)
{
}