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(-)
diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc
index 818e7cbc3d..71a2bff234 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)
--
2.34.1