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tcg: Use extract2 for cross-word 64-bit extract on 32-bit host

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Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2025-02-22 09:36:21 -08:00
parent 5500bd9e2e
commit 2225fa242c
1 changed files with 12 additions and 4 deletions
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16
tcg/tcg-op.c
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@ -2804,9 +2804,18 @@ void tcg_gen_extract_i64(TCGv_i64 ret, TCGv_i64 arg,
tcg_gen_movi_i32(TCGV_HIGH(ret), 0);
return;
}
/* The field is split across two words. One double-word
shift is better than two double-word shifts. */
goto do_shift_and;
/* The field is split across two words. */
tcg_gen_extract2_i32(TCGV_LOW(ret), TCGV_LOW(arg),
TCGV_HIGH(arg), ofs);
if (len <= 32) {
tcg_gen_extract_i32(TCGV_LOW(ret), TCGV_LOW(ret), 0, len);
tcg_gen_movi_i32(TCGV_HIGH(ret), 0);
} else {
tcg_gen_extract_i32(TCGV_HIGH(ret), TCGV_HIGH(arg),
ofs, len - 32);
}
return;
}
if (TCG_TARGET_extract_valid(TCG_TYPE_I64, ofs, len)) {
@ -2844,7 +2853,6 @@ void tcg_gen_extract_i64(TCGv_i64 ret, TCGv_i64 arg,
so that we get ext8u, ext16u, and ext32u. */
switch (len) {
case 1 ... 8: case 16: case 32:
do_shift_and:
tcg_gen_shri_i64(ret, arg, ofs);
tcg_gen_andi_i64(ret, ret, (1ull << len) - 1);
break;