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| author | Jakub Jelinek <jakub@redhat.com> | 2013-05-14 10:55:34 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2013-05-14 10:55:34 +0200 |
| commit | 75776c6d256cf2db9cd470484445bff01c7e30fa (patch) | |
| tree | cf62bd2045ab3fa40d75cb48379cb1295898c3a7 /gcc/simplify-rtx.c | |
| parent | df35498ae56e297e0de7279127cab265e71fc2d2 (diff) | |
| download | gcc-75776c6d256cf2db9cd470484445bff01c7e30fa.zip gcc-75776c6d256cf2db9cd470484445bff01c7e30fa.tar.gz gcc-75776c6d256cf2db9cd470484445bff01c7e30fa.tar.bz2 | |
expmed.c (expand_shift_1): Canonicalize rotates by constant bitsize / 2 to bitsize - 1.
* expmed.c (expand_shift_1): Canonicalize rotates by
constant bitsize / 2 to bitsize - 1.
* simplify-rt.x (simplify_binary_operation_1) <case ROTATE,
case ROTATERT>: Likewise.
Revert:
2013-05-10 Jakub Jelinek <jakub@redhat.com>
* config/i386/i386.md (rotateinv): New code attr.
(*<rotate_insn><mode>3_1, *<rotate_insn>si3_1_zext,
*<rotate_insn>qi3_1_slp): Emit rorl %eax instead of
roll $31, %eax, etc.
From-SVN: r198864
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index 791f91a..865d37d 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -3250,6 +3250,18 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode, case ROTATERT: case ROTATE: + /* Canonicalize rotates by constant amount. If op1 is bitsize / 2, + prefer left rotation, if op1 is from bitsize / 2 + 1 to + bitsize - 1, use other direction of rotate with 1 .. bitsize / 2 - 1 + amount instead. */ + if (CONST_INT_P (trueop1) + && IN_RANGE (INTVAL (trueop1), + GET_MODE_BITSIZE (mode) / 2 + (code == ROTATE), + GET_MODE_BITSIZE (mode) - 1)) + return simplify_gen_binary (code == ROTATE ? ROTATERT : ROTATE, + mode, op0, GEN_INT (GET_MODE_BITSIZE (mode) + - INTVAL (trueop1))); + /* FALLTHRU */ case ASHIFTRT: if (trueop1 == CONST0_RTX (mode)) return op0; |