diff options
Diffstat (limited to 'gcc/regmove.c')
| -rw-r--r-- | gcc/regmove.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/regmove.c b/gcc/regmove.c index c39e5cce7b7..cb5e547cecd 100644 --- a/gcc/regmove.c +++ b/gcc/regmove.c @@ -431,6 +431,16 @@ optimize_reg_copy_1 (insn, dest, src) continue; if (reg_set_p (src, p) || reg_set_p (dest, p) + /* If SRC is an asm-declared register, it must not be replaced + in any asm. Unfortunately, the REG_EXPR tree for the asm + variable may be absent in the SRC rtx, so we can't check the + actual register declaration easily (the asm operand will have + it, though). To avoid complicating the test for a rare case, + we just don't perform register replacement for a hard reg + mentioned in an asm. */ + || (sregno < FIRST_PSEUDO_REGISTER + && asm_noperands (PATTERN (p)) >= 0 + && reg_overlap_mentioned_p (src, PATTERN (p))) /* Don't change a USE of a register. */ || (GET_CODE (PATTERN (p)) == USE && reg_overlap_mentioned_p (src, XEXP (PATTERN (p), 0)))) |