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| author | Richard Henderson <rth@cygnus.com> | 2000-04-14 10:45:17 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2000-04-14 10:45:17 -0700 |
| commit | 23cdce68cfdbf75b2a7fc60ccf17477260db9f68 (patch) | |
| tree | 8cc9866caf0c8fef6ebbca671309cc014b1a0e80 | |
| parent | 6e628096889effd0046ea70a7c6910e181af7510 (diff) | |
| download | gcc-23cdce68cfdbf75b2a7fc60ccf17477260db9f68.zip gcc-23cdce68cfdbf75b2a7fc60ccf17477260db9f68.tar.gz gcc-23cdce68cfdbf75b2a7fc60ccf17477260db9f68.tar.bz2 | |
fold-const.c (extract_muldiv): Don't distribute and widen multiply across plus for non-sizetype unsigned types.
* fold-const.c (extract_muldiv): Don't distribute and widen
multiply across plus for non-sizetype unsigned types.
From-SVN: r33151
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/fold-const.c | 8 |
2 files changed, 13 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4465c29..29c1d1f 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 2000-04-14 Richard Henderson <rth@cygnus.com> + * fold-const.c (extract_muldiv): Don't distribute and widen + multiply across plus for non-sizetype unsigned types. + +2000-04-14 Richard Henderson <rth@cygnus.com> + * flow.c (find_auto_inc): Don't autoinc eliminable registers. If the original source is dead in the incr insn, it's dead now. diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 19b2f70..991dddd 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -4480,6 +4480,14 @@ extract_muldiv (t, c, code, wide_type) if (op1 == 0 || TREE_OVERFLOW (op1)) break; + /* If we have an unsigned type is not a sizetype, we cannot widen + the operation since it will change the result if the original + computation overflowed. */ + if (TREE_UNSIGNED (ctype) + && ! TYPE_IS_SIZETYPE (ctype) + && ctype != type) + break; + /* If we were able to eliminate our operation from the first side, apply our operation to the second side and reform the PLUS. */ if (t1 != 0 && (TREE_CODE (t1) != code || code == MULT_EXPR)) |