diff options
Diffstat (limited to 'gcc/gcse.c')
| -rw-r--r-- | gcc/gcse.c | 22 |
1 files changed, 17 insertions, 5 deletions
@@ -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: |