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| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/regmove.c | 8 |
2 files changed, 14 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 9d9bbe1..29440f5 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2001-08-10 Roman Zippel <zippel@linux-m68k.org> + Richard Henderson <rth@redhat.com> + + * regmove.c (regmove_optimize): Avoid setting a register twice in + a parallel set. + 2001-08-10 Richard Henderson <rth@redhat.com> * doc/extend.texi (Arrays and pointers implementation): Document 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 |