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[PULL,15/15] tcg/riscv: Conditionalize tcg_out_exts_i32_i64

Message ID 20230423101950.817899-16-richard.henderson@linaro.org
State Accepted
Commit 3ea9be33400f14305565a9a094cb6031c07183d5
Headers show
Series [PULL,01/15] tcg: Replace if + tcg_abort with tcg_debug_assert | expand

Commit Message

Richard Henderson April 23, 2023, 10:19 a.m. UTC 
Since TCG_TYPE_I32 values are kept sign-extended in registers, via "w"
instructions, we don't need to extend if the register matches.
This is already relied upon by comparisons.

Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/riscv/tcg-target.c.inc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/tcg/riscv/tcg-target.c.inc b/tcg/riscv/tcg-target.c.inc
index 328cbc0ad6..266fe1433d 100644
--- a/tcg/riscv/tcg-target.c.inc
+++ b/tcg/riscv/tcg-target.c.inc
@@ -609,7 +609,9 @@  static void tcg_out_ext32s(TCGContext *s, TCGReg ret, TCGReg arg)
 
 static void tcg_out_exts_i32_i64(TCGContext *s, TCGReg ret, TCGReg arg)
 {
-    tcg_out_ext32s(s, ret, arg);
+    if (ret != arg) {
+        tcg_out_ext32s(s, ret, arg);
+    }
 }
 
 static void tcg_out_extu_i32_i64(TCGContext *s, TCGReg ret, TCGReg arg)