diff options
| author | hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4> | 2008-09-13 15:47:41 +0000 |
|---|---|---|
| committer | hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4> | 2008-09-13 15:47:41 +0000 |
| commit | ecb6ee6d51d27e3bb64d3b951511b53a6bee37d8 (patch) | |
| tree | 3b638080cc63b5ea07d5ca5f583ecead6752090c /gcc/cse.c | |
| parent | 020396ef4720cfaa236cb238cdb5de233ce22fc7 (diff) | |
| download | gcc-ecb6ee6d51d27e3bb64d3b951511b53a6bee37d8.tar.gz | |
gcc/
2008-09-13 H.J. Lu <hongjiu.lu@intel.com>
PR rtl-optimization/37489
* cse.c (fold_rtx): Don't return const_true_rtx for float
compare if FLOAT_STORE_FLAG_VALUE is undefined.
gcc/testsuite/
2008-09-13 Raksit Ashok <raksit@google.com>
PR rtl-optimization/37489
* g++.dg/opt/cse3.C: New.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@140344 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/cse.c')
| -rw-r--r-- | gcc/cse.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/gcc/cse.c b/gcc/cse.c index c1effee8f03..b911879bf79 100644 --- a/gcc/cse.c +++ b/gcc/cse.c @@ -3214,17 +3214,24 @@ fold_rtx (rtx x, rtx insn) if (const_arg0 == 0 || const_arg1 == 0) { struct table_elt *p0, *p1; - rtx true_rtx = const_true_rtx, false_rtx = const0_rtx; + rtx true_rtx, false_rtx; enum machine_mode mode_arg1; -#ifdef FLOAT_STORE_FLAG_VALUE if (SCALAR_FLOAT_MODE_P (mode)) { +#ifdef FLOAT_STORE_FLAG_VALUE true_rtx = (CONST_DOUBLE_FROM_REAL_VALUE (FLOAT_STORE_FLAG_VALUE (mode), mode)); +#else + true_rtx = NULL_RTX; +#endif false_rtx = CONST0_RTX (mode); } -#endif + else + { + true_rtx = const_true_rtx; + false_rtx = const0_rtx; + } code = find_comparison_args (code, &folded_arg0, &folded_arg1, &mode_arg0, &mode_arg1); @@ -3332,8 +3339,17 @@ fold_rtx (rtx x, rtx insn) const_arg1)) || (REG_P (folded_arg1) && (REG_QTY (REGNO (folded_arg1)) == ent->comparison_qty)))) - return (comparison_dominates_p (ent->comparison_code, code) - ? true_rtx : false_rtx); + { + if (comparison_dominates_p (ent->comparison_code, code)) + { + if (true_rtx) + return true_rtx; + else + break; + } + else + return false_rtx; + } } } } |