From: Richard Henderson <richard.henderson@linaro.org>
Date: Tue, 30 Oct 2018 21:52:44 +0000 (+0000)
Subject: tcg/i386: Always use %ebp for TCG_AREG0
X-Git-Tag: v4.0.0-rc0~205^2~31
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5740d9f714835964873325d1210b26811252843f;p=thirdparty%2Fqemu.git

tcg/i386: Always use %ebp for TCG_AREG0

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.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---

diff --git a/tcg/i386/tcg-target.h b/tcg/i386/tcg-target.h
index 9fdf37f23c2..7488c3d8696 100644
--- a/tcg/i386/tcg-target.h
+++ b/tcg/i386/tcg-target.h
@@ -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 */
@@ -194,12 +196,6 @@ 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)
 {
 }