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| author | Jakub Jelinek <jakub@redhat.com> | 2001-05-11 22:08:04 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2001-05-11 22:08:04 +0200 |
| commit | 3721581af164ecdc50346c435a098d4ea806d66c (patch) | |
| tree | e3f47db684b16470dfb3de36d6dfa30d84afe0f6 /gcc/regmove.c | |
| parent | fecd6201e6051a32f6645dcb3138526a2e6b0100 (diff) | |
| download | gcc-3721581af164ecdc50346c435a098d4ea806d66c.zip gcc-3721581af164ecdc50346c435a098d4ea806d66c.tar.gz gcc-3721581af164ecdc50346c435a098d4ea806d66c.tar.bz2 | |
regmove.c (regmove_optimize): Suppress the optimization for unchanging destination register.
* regmove.c (regmove_optimize): Suppress the optimization for
unchanging destination register. Add comment above function.
From-SVN: r41974
Diffstat (limited to 'gcc/regmove.c')
| -rw-r--r-- | gcc/regmove.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gcc/regmove.c b/gcc/regmove.c index a151d6f..910c422 100644 --- a/gcc/regmove.c +++ b/gcc/regmove.c @@ -1060,6 +1060,12 @@ fixup_match_2 (insn, dst, src, offset, regmove_dump_file) return 0; } +/* Main entry for the register move optimization. + F is the first instruction. + NREGS is one plus the highest pseudo-reg number used in the instruction. + REGMOVE_DUMP_FILE is a stream for output of a trace of actions taken + (or 0 if none should be output). */ + void regmove_optimize (f, nregs, regmove_dump_file) rtx f; @@ -1282,7 +1288,8 @@ regmove_optimize (f, nregs, regmove_dump_file) if (GET_CODE (dst) != REG || REGNO (dst) < FIRST_PSEUDO_REGISTER - || REG_LIVE_LENGTH (REGNO (dst)) < 0) + || REG_LIVE_LENGTH (REGNO (dst)) < 0 + || RTX_UNCHANGING_P (dst)) continue; /* If the operands already match, then there is nothing to do. */ |