[PULL,27/29] target/arm: Use tcg_gen_rotri_i32 for gen_swap_half
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Message ID 20190816131719.28244-28-peter.maydell@linaro.org
State New
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Series
  • Untitled series #125590
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Commit Message

Peter Maydell Aug. 16, 2019, 1:17 p.m. UTC
From: Richard Henderson <richard.henderson@linaro.org>

Rotate is the more compact and obvious way to swap 16-bit
elements of a 32-bit word.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20190808202616.13782-6-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/translate.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

Patch
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diff --git a/target/arm/translate.c b/target/arm/translate.c
index 02ce8d44fa1..2e160646206 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -444,11 +444,7 @@  static TCGv_i64 gen_muls_i64_i32(TCGv_i32 a, TCGv_i32 b)
 /* Swap low and high halfwords.  */
 static void gen_swap_half(TCGv_i32 var)
 {
-    TCGv_i32 tmp = tcg_temp_new_i32();
-    tcg_gen_shri_i32(tmp, var, 16);
-    tcg_gen_shli_i32(var, var, 16);
-    tcg_gen_or_i32(var, var, tmp);
-    tcg_temp_free_i32(tmp);
+    tcg_gen_rotri_i32(var, var, 16);
 }
 
 /* Dual 16-bit add.  Result placed in t0 and t1 is marked as dead.