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| author | Richard Henderson <rth@redhat.com> | 2004-09-13 02:05:31 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2004-09-13 02:05:31 -0700 |
| commit | 0d87c765251e8619f4eb86894bdcf109367d0274 (patch) | |
| tree | c07f98b7d57da963ba6c6d9edd7cb156910bc1e4 /gcc/postreload.c | |
| parent | ddef210a8919486d2d9f9b65c914435a39b21060 (diff) | |
| download | gcc-0d87c765251e8619f4eb86894bdcf109367d0274.zip gcc-0d87c765251e8619f4eb86894bdcf109367d0274.tar.gz gcc-0d87c765251e8619f4eb86894bdcf109367d0274.tar.bz2 | |
re PR inline-asm/6806 (gcc 3.0.4 ignoring clobbered registers in inline asm with -O1 or higher on i386)
PR inline-asm/6806
* cselib.c (cselib_invalidate_rtx): Export. Remove unused args.
(cselib_invalidate_rtx_note_stores): New.
(cselib_record_sets, cselib_process_insn): Update to match.
* cselib.h (cselib_invalidate_rtx): Declare.
* postreload.c (reload_cse_simplify): Invalidate asm clobbers.
From-SVN: r87432
Diffstat (limited to 'gcc/postreload.c')
| -rw-r--r-- | gcc/postreload.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/postreload.c b/gcc/postreload.c index 20d4a4f..2ff95b1 100644 --- a/gcc/postreload.c +++ b/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) |