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| author | Bill Schmidt <wschmidt@linux.vnet.ibm.com> | 2013-03-20 13:24:12 +0000 |
|---|---|---|
| committer | William Schmidt <wschmidt@gcc.gnu.org> | 2013-03-20 13:24:12 +0000 |
| commit | cca1130d11997d40bd37603fab5953ccf8061331 (patch) | |
| tree | 8d09c10eb8fe0b0c3a6649a5f43982ffed087631 /gcc/loop-iv.c | |
| parent | 818d4efaa751bfe0f2a69edfb3eeb5a3a0877b63 (diff) | |
| download | gcc-cca1130d11997d40bd37603fab5953ccf8061331.zip gcc-cca1130d11997d40bd37603fab5953ccf8061331.tar.gz gcc-cca1130d11997d40bd37603fab5953ccf8061331.tar.bz2 | |
re PR rtl-optimization/56605 (Redundant branch introduced during loop2 phases)
gcc:
2013-03-13 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
Steven Bosscher <steven@gcc.gnu.org>
PR rtl-optimization/56605
* loop-iv.c (implies_p): Handle equal RTXs and subregs.
gcc/testsuite:
2013-03-13 Bill Schmidt wschmidt@linux.vnet.ibm.com>
PR rtl-optimization/56605
* gcc.target/powerpc/pr56605.c: New.
Co-Authored-By: Steven Bosscher <steven@gcc.gnu.org>
From-SVN: r196823
Diffstat (limited to 'gcc/loop-iv.c')
| -rw-r--r-- | gcc/loop-iv.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/gcc/loop-iv.c b/gcc/loop-iv.c index 15f1661..0847307 100644 --- a/gcc/loop-iv.c +++ b/gcc/loop-iv.c @@ -1496,19 +1496,26 @@ implies_p (rtx a, rtx b) rtx op0, op1, opb0, opb1, r; enum machine_mode mode; + if (rtx_equal_p (a, b)) + return true; + if (GET_CODE (a) == EQ) { op0 = XEXP (a, 0); op1 = XEXP (a, 1); - if (REG_P (op0)) + if (REG_P (op0) + || (GET_CODE (op0) == SUBREG + && REG_P (SUBREG_REG (op0)))) { r = simplify_replace_rtx (b, op0, op1); if (r == const_true_rtx) return true; } - if (REG_P (op1)) + if (REG_P (op1) + || (GET_CODE (op1) == SUBREG + && REG_P (SUBREG_REG (op1)))) { r = simplify_replace_rtx (b, op1, op0); if (r == const_true_rtx) |