diff options
Diffstat (limited to 'contrib/gcc/postreload.c')
| -rw-r--r-- | contrib/gcc/postreload.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/contrib/gcc/postreload.c b/contrib/gcc/postreload.c index 6f567f0..8d7461e 100644 --- a/contrib/gcc/postreload.c +++ b/contrib/gcc/postreload.c @@ -118,6 +118,19 @@ reload_cse_simplify (rtx insn, rtx testreg) int count = 0; rtx value = NULL_RTX; + /* Registers mentioned in the clobber list for an asm cannot be reused + within the body of the asm. Invalidate those registers now so that + we don't try to substitute values for them. */ + if (asm_noperands (body) >= 0) + { + for (i = XVECLEN (body, 0) - 1; i >= 0; --i) + { + rtx part = XVECEXP (body, 0, i); + if (GET_CODE (part) == CLOBBER && REG_P (XEXP (part, 0))) + cselib_invalidate_rtx (XEXP (part, 0)); + } + } + /* If every action in a PARALLEL is a noop, we can delete the entire PARALLEL. */ for (i = XVECLEN (body, 0) - 1; i >= 0; --i) |
