[PATCH] target/mips: Remove unused register from MSA 2R/2RF instruction format

[PATCH] target/mips: Remove unused register from MSA 2R/2RF instruction format

[Philippe Mathieu-Daudé]

MSA 2R/2RF instructions don't use any target vector register.
Remove the unused TCG temporaries.

Fixes: cbe50b9a8e7 ("target-mips: add MSA VEC/2R format instructions")
Fixes: 3bdeb68866e ("target-mips: add MSA 2RF format instructions")
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 target/mips/tcg/msa_translate.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/target/mips/tcg/msa_translate.c b/target/mips/tcg/msa_translate.c
index 8170a8df26b..ee6424126f7 100644
--- a/target/mips/tcg/msa_translate.c
+++ b/target/mips/tcg/msa_translate.c
@@ -1942,13 +1942,11 @@ static void gen_msa_2r(DisasContext *ctx)
 {
 #define MASK_MSA_2R(op)     (MASK_MSA_MINOR(op) | (op & (0x1f << 21)) | \
                             (op & (0x7 << 18)))
-    uint8_t wt = (ctx->opcode >> 16) & 0x1f;
     uint8_t ws = (ctx->opcode >> 11) & 0x1f;
     uint8_t wd = (ctx->opcode >> 6) & 0x1f;
     uint8_t df = (ctx->opcode >> 16) & 0x3;
     TCGv_i32 twd = tcg_const_i32(wd);
     TCGv_i32 tws = tcg_const_i32(ws);
-    TCGv_i32 twt = tcg_const_i32(wt);
     TCGv_i32 tdf = tcg_const_i32(df);
 
     switch (MASK_MSA_2R(ctx->opcode)) {
@@ -2018,7 +2016,6 @@ static void gen_msa_2r(DisasContext *ctx)
 
     tcg_temp_free_i32(twd);
     tcg_temp_free_i32(tws);
-    tcg_temp_free_i32(twt);
     tcg_temp_free_i32(tdf);
 }
 
@@ -2026,13 +2023,11 @@ static void gen_msa_2rf(DisasContext *ctx)
 {
 #define MASK_MSA_2RF(op)    (MASK_MSA_MINOR(op) | (op & (0x1f << 21)) | \
                             (op & (0xf << 17)))
-    uint8_t wt = (ctx->opcode >> 16) & 0x1f;
     uint8_t ws = (ctx->opcode >> 11) & 0x1f;
     uint8_t wd = (ctx->opcode >> 6) & 0x1f;
     uint8_t df = (ctx->opcode >> 16) & 0x1;
     TCGv_i32 twd = tcg_const_i32(wd);
     TCGv_i32 tws = tcg_const_i32(ws);
-    TCGv_i32 twt = tcg_const_i32(wt);
     /* adjust df value for floating-point instruction */
     TCGv_i32 tdf = tcg_const_i32(df + 2);
 
@@ -2089,7 +2084,6 @@ static void gen_msa_2rf(DisasContext *ctx)
 
     tcg_temp_free_i32(twd);
     tcg_temp_free_i32(tws);
-    tcg_temp_free_i32(twt);
     tcg_temp_free_i32(tdf);
 }
 
-- 
2.31.1

Re: [PATCH] target/mips: Remove unused register from MSA 2R/2RF instruction format

[Richard Henderson]

On 10/2/21 8:25 PM, Philippe Mathieu-Daudé wrote:
> MSA 2R/2RF instructions don't use any target vector register.
> Remove the unused TCG temporaries.
> 
> Fixes: cbe50b9a8e7 ("target-mips: add MSA VEC/2R format instructions")
> Fixes: 3bdeb68866e ("target-mips: add MSA 2RF format instructions")
> Signed-off-by: Philippe Mathieu-Daudé<f4bug@amsat.org>
> ---
>   target/mips/tcg/msa_translate.c | 6 ------
>   1 file changed, 6 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~