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| author | Vladimir N. Makarov <vmakarov@cygnus.com> | 1998-07-28 12:54:04 +0000 |
|---|---|---|
| committer | Vladimir Makarov <vmakarov@gcc.gnu.org> | 1998-07-28 12:54:04 +0000 |
| commit | 1ed0205e3520f6f2b1d68ab3266e8afbc61695e6 (patch) | |
| tree | 397ded5aa1d2ca77c11ef93e982306030a77bfa7 /gcc/rtlanal.c | |
| parent | 4d17a06f32ff0fad8f8783e39ef34083174ba3e6 (diff) | |
| download | gcc-1ed0205e3520f6f2b1d68ab3266e8afbc61695e6.zip gcc-1ed0205e3520f6f2b1d68ab3266e8afbc61695e6.tar.gz gcc-1ed0205e3520f6f2b1d68ab3266e8afbc61695e6.tar.bz2 | |
cse.c (cse_insn): Enable subsitution inside libcall only for REG, SUBREG, MEM.
�
* cse.c (cse_insn): Enable subsitution inside libcall only for REG,
SUBREG, MEM.
* rtlanal.c (replace_rtx): Prohibit replaces in CONST_DOUBLE.
From-SVN: r21435
Diffstat (limited to 'gcc/rtlanal.c')
| -rw-r--r-- | gcc/rtlanal.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c index 8f42391..221b3fa 100644 --- a/gcc/rtlanal.c +++ b/gcc/rtlanal.c @@ -1765,7 +1765,8 @@ inequality_comparisons_p (x) return 0; } -/* Replace any occurrence of FROM in X with TO. +/* Replace any occurrence of FROM in X with TO. The function does + not enter into CONST_DOUBLE for the replace. Note that copying is not done so X must not be shared unless all copies are to be modified. */ @@ -1777,6 +1778,11 @@ replace_rtx (x, from, to) register int i, j; register char *fmt; + /* The following prevents loops occurrence when we change MEM in + CONST_DOUBLE onto the same CONST_DOUBLE. */ + if (x != 0 && GET_CODE (x) == CONST_DOUBLE) + return x; + if (x == from) return to; |