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| author | brendan <brendan@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-10-13 17:28:29 +0000 |
|---|---|---|
| committer | brendan <brendan@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-10-13 17:28:29 +0000 |
| commit | 422c88923ada00584c7cb8f9bceb160fdee489b4 (patch) | |
| tree | b559d43a043dfcd6958e9e6b61b288a3f37ea958 /gcc/regmove.c | |
| parent | a5deb6f6f673dbab2380742300fd418e57741303 (diff) | |
| download | gcc-422c88923ada00584c7cb8f9bceb160fdee489b4.tar.gz | |
* regmove.c (optimize_reg_copy_3): Make sure P is non-nil as we
climb up the chain of insns.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@29949 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/regmove.c')
| -rw-r--r-- | gcc/regmove.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/gcc/regmove.c b/gcc/regmove.c index 98061afa482..c637743e595 100644 --- a/gcc/regmove.c +++ b/gcc/regmove.c @@ -679,7 +679,7 @@ optimize_reg_copy_3 (insn, dest, src) || ! find_reg_note (insn, REG_DEAD, src_reg) || REG_N_SETS (src_no) != 1) return; - for (p = PREV_INSN (insn); ! reg_set_p (src_reg, p); p = PREV_INSN (p)) + for (p = PREV_INSN (insn); p && ! reg_set_p (src_reg, p); p = PREV_INSN (p)) { if (GET_CODE (p) == CODE_LABEL || GET_CODE (p) == JUMP_INSN || (GET_CODE (p) == NOTE @@ -698,6 +698,9 @@ optimize_reg_copy_3 (insn, dest, src) if (GET_RTX_CLASS (GET_CODE (p)) != 'i') continue; } + if (! p) + return; + if (! (set = single_set (p)) || GET_CODE (SET_SRC (set)) != MEM || SET_DEST (set) != src_reg) |