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target/arm: Improve REVSH

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The new bswap flags can implement the semantics exactly.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-06-13 16:21:01 -07:00
parent 50a7470e3e
commit ebdd503d45
1 changed files with 1 additions and 3 deletions
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4
target/arm/translate.c
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@ -354,9 +354,7 @@ void gen_rev16(TCGv_i32 dest, TCGv_i32 var)
/* Byteswap low halfword and sign extend. */
static void gen_revsh(TCGv_i32 dest, TCGv_i32 var)
{
tcg_gen_ext16u_i32(var, var);
tcg_gen_bswap16_i32(var, var, TCG_BSWAP_IZ | TCG_BSWAP_OZ);
tcg_gen_ext16s_i32(dest, var);
tcg_gen_bswap16_i32(var, var, TCG_BSWAP_OS);
}
/* Dual 16-bit add. Result placed in t0 and t1 is marked as dead.