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[v2,14/54] tcg/i386: Conditionalize tcg_out_extu_i32_i64

Message ID 20230411010512.5375-15-richard.henderson@linaro.org
State New
Headers show
Series tcg: Simplify calls to load/store helpers | expand

Commit Message

Richard Henderson April 11, 2023, 1:04 a.m. UTC 
Since TCG_TYPE_I32 values are kept zero-extended in registers, via
omission of the REXW bit, we need not extend if the register matches.
This is already relied upon by qemu_{ld,st}.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/i386/tcg-target.c.inc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc
index 40d661072b..a156929477 100644
--- a/tcg/i386/tcg-target.c.inc
+++ b/tcg/i386/tcg-target.c.inc
@@ -1306,7 +1306,9 @@  static void tcg_out_exts_i32_i64(TCGContext *s, TCGReg dest, TCGReg src)
 
 static void tcg_out_extu_i32_i64(TCGContext *s, TCGReg dest, TCGReg src)
 {
-    tcg_out_ext32u(s, dest, src);
+    if (dest != src) {
+        tcg_out_ext32u(s, dest, src);
+    }
 }
 
 static inline void tcg_out_bswap64(TCGContext *s, int reg)