diff options
| author | bonzini <bonzini@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-12-20 17:06:14 +0000 |
|---|---|---|
| committer | bonzini <bonzini@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-12-20 17:06:14 +0000 |
| commit | 00ce82e32acdca19491df20f37a3f424a92ca3ee (patch) | |
| tree | 82d3d092201bbbb1c8e056d0e465dbc2ca06c1a6 /gcc/gcse.c | |
| parent | 85c1f5872eb89ba116deaf5858be761bf34ddc8d (diff) | |
| download | gcc-00ce82e32acdca19491df20f37a3f424a92ca3ee.tar.gz | |
2005-12-20 Roger Sayle <roger@eyesopen.com>
Paolo Bonzini <bonzini@gnu.org>
PR rtl-optimization/25115
* gcse.c (pre_insert_copy_insn): Fall back to the sole
SET in the insn if there is no SET for an
expression that is equivalent to EXPR.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@108855 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/gcse.c')
| -rw-r--r-- | gcc/gcse.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/gcc/gcse.c b/gcc/gcse.c index df6e48436a1..8e4dbecb672 100644 --- a/gcc/gcse.c +++ b/gcc/gcse.c @@ -4219,7 +4219,7 @@ pre_insert_copy_insn (struct expr *expr, rtx insn) int regno = REGNO (reg); int indx = expr->bitmap_index; rtx pat = PATTERN (insn); - rtx set, new_insn; + rtx set, first_set, new_insn; rtx old_reg; int i; @@ -4233,17 +4233,29 @@ pre_insert_copy_insn (struct expr *expr, rtx insn) case PARALLEL: /* Search through the parallel looking for the set whose source was the expression that we're interested in. */ + first_set = NULL_RTX; set = NULL_RTX; for (i = 0; i < XVECLEN (pat, 0); i++) { rtx x = XVECEXP (pat, 0, i); - if (GET_CODE (x) == SET - && expr_equiv_p (SET_SRC (x), expr->expr)) + if (GET_CODE (x) == SET) { - set = x; - break; + /* If the source was a REG_EQUAL or REG_EQUIV note, we + may not find an equivalent expression, but in this + case the PARALLEL will have a single set. */ + if (first_set == NULL_RTX) + first_set = x; + if (expr_equiv_p (SET_SRC (x), expr->expr)) + { + set = x; + break; + } } } + + gcc_assert (first_set); + if (set == NULL_RTX) + set = first_set; break; default: |