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target/m68k: Optimize rotate_x() using extract_i32() 

Optimize rotate_x() using tcg_gen_extract_i32(). We can now free the
'sz' tcg_temp earlier. Since it is allocated with tcg_const_i32(),
free it with tcg_temp_free_i32().

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20190310003428.11723-6-f4bug@amsat.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Philippe Mathieu-Daudé 2019-03-10 01:34:27 +01:00 committed by Laurent Vivier
parent 44c64e9095
commit 60d3d0cfeb
1 changed files with 2 additions and 3 deletions
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5
target/m68k/translate.c
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@ -3693,6 +3693,7 @@ static TCGv rotate_x(TCGv reg, TCGv shift, int left, int size)
tcg_gen_sub_i32(shl, shl, shift); /* shl = size + 1 - shift */
tcg_gen_sub_i32(shx, sz, shift); /* shx = size - shift */
}
tcg_temp_free_i32(sz);
/* reg = (reg << shl) | (reg >> shr) | (x << shx); */
@ -3708,9 +3709,7 @@ static TCGv rotate_x(TCGv reg, TCGv shift, int left, int size)
/* X = (reg >> size) & 1 */
X = tcg_temp_new();
tcg_gen_shr_i32(X, reg, sz);
tcg_gen_andi_i32(X, X, 1);
tcg_temp_free(sz);
tcg_gen_extract_i32(X, reg, size, 1);
return X;
}