diff options
Diffstat (limited to 'gcc/regmove.c')
| -rw-r--r-- | gcc/regmove.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/regmove.c b/gcc/regmove.c index 587acea..ac1675e 100644 --- a/gcc/regmove.c +++ b/gcc/regmove.c @@ -1319,6 +1319,14 @@ regmove_optimize (f, nregs, regmove_dump_file) if (! set) continue; + /* Note that single_set ignores parts of a parallel set for + which one of the destinations is REG_UNUSED. We can't + handle that here, since we can wind up rewriting things + such that a single register is set twice within a single + parallel. */ + if (reg_set_p (src, insn)) + continue; + /* match_no/dst must be a write-only operand, and operand_operand/src must be a read-only operand. */ if (match.use[op_no] != READ |