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| author | Uros Bizjak <uros@gcc.gnu.org> | 2008-09-18 12:17:42 +0200 |
|---|---|---|
| committer | Uros Bizjak <uros@gcc.gnu.org> | 2008-09-18 12:17:42 +0200 |
| commit | 02bb8bce3b2320851f33ea3ab5fae6f575878670 (patch) | |
| tree | d51fb55aa9413a7aeb275dc45346fdedf41db963 /gcc/regrename.c | |
| parent | d9e74dfcc1f54a2b34fa12468cc3ca884058a6f1 (diff) | |
| download | gcc-02bb8bce3b2320851f33ea3ab5fae6f575878670.tar.gz | |
re PR rtl-optimization/37544 (Conversion double -> unsigned long long -> unsigned -> double gives wrong results)
PR rtl-optimization/37544
* regrename.c (maybe_mode_change): Exit early when copy_mode
is narrower than orig_mode and narrower than new_mode.
testsuite/ChangeLog:
PR rtl-optimization/37544
* gcc.dg/pr37544.c: New test.
From-SVN: r140446
Diffstat (limited to 'gcc/regrename.c')
| -rw-r--r-- | gcc/regrename.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/regrename.c b/gcc/regrename.c index bd2373cbb5a..e70dae8d139 100644 --- a/gcc/regrename.c +++ b/gcc/regrename.c @@ -1314,6 +1314,10 @@ maybe_mode_change (enum machine_mode orig_mode, enum machine_mode copy_mode, enum machine_mode new_mode, unsigned int regno, unsigned int copy_regno ATTRIBUTE_UNUSED) { + if (GET_MODE_SIZE (copy_mode) < GET_MODE_SIZE (orig_mode) + && GET_MODE_SIZE (copy_mode) < GET_MODE_SIZE (new_mode)) + return NULL_RTX; + if (orig_mode == new_mode) return gen_rtx_raw_REG (new_mode, regno); else if (mode_change_ok (orig_mode, new_mode, regno)) |