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tcg: Expand fallback sub2 with 32-bit operations

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No need to expand to i64 to perform the subtract.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson
2025-04-28 13:40:17 -07:00
parent 3ff7e44ef3
commit 3db22914ce
1 changed files with 9 additions and 8 deletions
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tcg/tcg-op.c
+9 -8
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@@ -1123,14 +1123,15 @@ void tcg_gen_sub2_i32(TCGv_i32 rl, TCGv_i32 rh, TCGv_i32 al,
if (TCG_TARGET_HAS_sub2_i32) {
tcg_gen_op6_i32(INDEX_op_sub2_i32, rl, rh, al, ah, bl, bh);
} else {
TCGv_i64 t0 = tcg_temp_ebb_new_i64();
TCGv_i64 t1 = tcg_temp_ebb_new_i64();
tcg_gen_concat_i32_i64(t0, al, ah);
tcg_gen_concat_i32_i64(t1, bl, bh);
tcg_gen_sub_i64(t0, t0, t1);
tcg_gen_extr_i64_i32(rl, rh, t0);
tcg_temp_free_i64(t0);
tcg_temp_free_i64(t1);
TCGv_i32 t0 = tcg_temp_ebb_new_i32();
TCGv_i32 t1 = tcg_temp_ebb_new_i32();
tcg_gen_sub_i32(t0, al, bl);
tcg_gen_setcond_i32(TCG_COND_LTU, t1, al, bl);
tcg_gen_sub_i32(rh, ah, bh);
tcg_gen_sub_i32(rh, rh, t1);
tcg_gen_mov_i32(rl, t0);
tcg_temp_free_i32(t0);
tcg_temp_free_i32(t1);
}
}