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| author | Doug Kwan <dougkwan@google.com> | 2009-10-05 09:08:46 +0000 |
|---|---|---|
| committer | Doug Kwan <dougkwan@gcc.gnu.org> | 2009-10-05 09:08:46 +0000 |
| commit | 56fe3eff33f4376fb5104d8eaf109618cb07fc9e (patch) | |
| tree | 4c9459bd6788b618c7453a190aaeecfcf02a4bf2 /gcc | |
| parent | 9cb26fc5c3ed73a784f5030e30ba13f0ad641d8f (diff) | |
| download | gcc-56fe3eff33f4376fb5104d8eaf109618cb07fc9e.zip gcc-56fe3eff33f4376fb5104d8eaf109618cb07fc9e.tar.gz gcc-56fe3eff33f4376fb5104d8eaf109618cb07fc9e.tar.bz2 | |
re PR rtl-optimization/41574 (Distribute floating point expressions causes bad code [4.4 only])
2009-10-05 Doug Kwan <dougkwan@google.com>
PR rtl-optimization/41574
Index: combine.c (distribute_and_simplify_rtx): Quit if RTX mode is
floating point and we are not doing unsafe math optimizations.
From-SVN: r152443
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/combine.c | 6 |
2 files changed, 12 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 62d725c..c9e635d 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2009-10-05 Doug Kwan <dougkwan@google.com> + + PR rtl-optimization/41574 + Index: combine.c (distribute_and_simplify_rtx): Quit if RTX mode is + floating point and we are not doing unsafe math optimizations. + 2009-10-03 Simon Baldwin <simonb@google.com> Cary Coutant <ccoutant@google.com> Rafael Espindola <espindola@google.com> diff --git a/gcc/combine.c b/gcc/combine.c index 35ab576..64cf992 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -8811,6 +8811,12 @@ distribute_and_simplify_rtx (rtx x, int n) enum rtx_code outer_code, inner_code; rtx decomposed, distributed, inner_op0, inner_op1, new_op0, new_op1, tmp; + /* Distributivity is not true for floating point as it can change the + value. So we don't do it unless -funsafe-math-optimizations. */ + if (FLOAT_MODE_P (GET_MODE (x)) + && ! flag_unsafe_math_optimizations) + return NULL_RTX; + decomposed = XEXP (x, n); if (!ARITHMETIC_P (decomposed)) return NULL_RTX; |