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target/arm: Use tcg_gen_rotri_i32 for gen_swap_half

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

Backports commit adefba76e8bf10dfb342094d2f5debfeedb1a74d from qemu
This commit is contained in:
Richard Henderson 2019-11-18 20:27:09 -05:00 committed by Lioncash
parent 751ab7b24b
commit 4a1cc16eef
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 1 additions and 5 deletions
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6
qemu/target/arm/translate.c
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@ -457,11 +457,7 @@ static TCGv_i64 gen_muls_i64_i32(DisasContext *s, TCGv_i32 a, TCGv_i32 b)
static void gen_swap_half(DisasContext *s, TCGv_i32 var)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGv_i32 tmp = tcg_temp_new_i32(tcg_ctx);
tcg_gen_shri_i32(tcg_ctx, tmp, var, 16);
tcg_gen_shli_i32(tcg_ctx, var, var, 16);
tcg_gen_or_i32(tcg_ctx, var, var, tmp);
tcg_temp_free_i32(tcg_ctx, tmp);
tcg_gen_rotri_i32(tcg_ctx, var, var, 16);
}
/* Dual 16-bit add. Result placed in t0 and t1 is marked as dead.