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tcg: Canonicalize subi to addi during opcode generation

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Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20231026013945.1152174-2-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-10-25 18:39:42 -07:00
parent 26aac97c84
commit 1551004eeb
1 changed files with 2 additions and 16 deletions
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18
tcg/tcg-op.c
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@ -372,12 +372,7 @@ void tcg_gen_subfi_i32(TCGv_i32 ret, int32_t arg1, TCGv_i32 arg2)
void tcg_gen_subi_i32(TCGv_i32 ret, TCGv_i32 arg1, int32_t arg2) void tcg_gen_subi_i32(TCGv_i32 ret, TCGv_i32 arg1, int32_t arg2)
{ {
/* some cases can be optimized here */ tcg_gen_addi_i32(ret, arg1, -arg2);
if (arg2 == 0) {
tcg_gen_mov_i32(ret, arg1);
} else {
tcg_gen_sub_i32(ret, arg1, tcg_constant_i32(arg2));
}
} }
void tcg_gen_neg_i32(TCGv_i32 ret, TCGv_i32 arg) void tcg_gen_neg_i32(TCGv_i32 ret, TCGv_i32 arg)
@ -1752,16 +1747,7 @@ void tcg_gen_subfi_i64(TCGv_i64 ret, int64_t arg1, TCGv_i64 arg2)
void tcg_gen_subi_i64(TCGv_i64 ret, TCGv_i64 arg1, int64_t arg2) void tcg_gen_subi_i64(TCGv_i64 ret, TCGv_i64 arg1, int64_t arg2)
{ {
/* some cases can be optimized here */ tcg_gen_addi_i64(ret, arg1, -arg2);
if (arg2 == 0) {
tcg_gen_mov_i64(ret, arg1);
} else if (TCG_TARGET_REG_BITS == 64) {
tcg_gen_sub_i64(ret, arg1, tcg_constant_i64(arg2));
} else {
tcg_gen_sub2_i32(TCGV_LOW(ret), TCGV_HIGH(ret),
TCGV_LOW(arg1), TCGV_HIGH(arg1),
tcg_constant_i32(arg2), tcg_constant_i32(arg2 >> 32));
}
} }
void tcg_gen_neg_i64(TCGv_i64 ret, TCGv_i64 arg) void tcg_gen_neg_i64(TCGv_i64 ret, TCGv_i64 arg)