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[PATCH] gcc/config/c6x/c6x.md: Remove "clobber (match_scratch ...)" in "movmisalign<mode>_store".
- From: Chen Gang <xili_gchen_5257 at hotmail dot com>
- To: Jeff Law <law at redhat dot com>, bernds at codesourcery dot com
- Cc: gcc-patches List <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 27 Mar 2015 08:05:46 +0800
- Subject: [PATCH] gcc/config/c6x/c6x.md: Remove "clobber (match_scratch ...)" in "movmisalign<mode>_store".
- Authentication-results: sourceware.org; auth=none
For misalignment memory access, c6x gcc will cause issue, so need remove
"clobber (match_scratch ...)" which will be symmetric with "movmisalign
<mode>_load", then pass compiling and generate correct assembly code.
The related issue:
[root@localhost c6x]# cat test.i
int oxu_driver_init(void)
{
*(volatile unsigned int *)(-1) = *(unsigned int *)(-1);
}
[root@localhost c6x]# /upstream/release-c6x/libexec/gcc/tic6x-gchen-elf/5.0.0/cc1 -Os test.i
oxu_driver_init
test.i: In function 'oxu_driver_init':
test.i:4:1: error: unrecognizable insn:
}
^
(insn 9 8 12 2 (set (mem/v:SI (reg/f:SI 77) [1 MEM[(volatile unsigned int *)4294967295B]+0 S4 A8])
(unspec:SI [
(reg:SI 73 [ D.1542 ])
] UNSPEC_MISALIGNED_ACCESS)) test.i:3 -1
(nil))
test.i:4:1: internal compiler error: in extract_insn, at recog.c:2343
0x9f8645 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*)
../../gcc-c6x/gcc/rtl-error.c:110
0x9f8679 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
../../gcc-c6x/gcc/rtl-error.c:118
0x9ce127 extract_insn(rtx_insn*)
../../gcc-c6x/gcc/recog.c:2343
0x7c759b instantiate_virtual_regs_in_insn
../../gcc-c6x/gcc/function.c:1598
0x7c759b instantiate_virtual_regs
../../gcc-c6x/gcc/function.c:1966
0x7c759b execute
../../gcc-c6x/gcc/function.c:2015
Please submit a full bug report,
Related output after fix (I guess it is OK, please check):
.file "test.i"
.c6xabi_attribute Tag_ABI_array_object_alignment, 0
.c6xabi_attribute Tag_ABI_array_object_align_expected, 0
.c6xabi_attribute Tag_ABI_stack_align_needed, 0
.c6xabi_attribute Tag_ABI_stack_align_preserved, 0
.c6xabi_attribute Tag_ABI_conformance, "1.0"
.text;
.align 2
.global oxu_driver_init
.type oxu_driver_init, @function
oxu_driver_init:
mvk .d1 11, A4
ldnw .d1t1 *A4, A3
nop 4
stnw .d1t1 A3, *A4
ret .s2 B3
nop 5
.size oxu_driver_init, .-oxu_driver_init
.ident "GCC: (GNU) 5.0.0 20150321 (experimental)"
2015-03-27 Chen Gang <gang.chen.5i5j@gmail.com>
* config/c6x/c6x.md (movmisalign<mode>_store): Remove "clobber
(match_scratch ...)".
---
gcc/config/c6x/c6x.md | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/gcc/config/c6x/c6x.md b/gcc/config/c6x/c6x.md
index 892aac4..6a3157f 100644
--- a/gcc/config/c6x/c6x.md
+++ b/gcc/config/c6x/c6x.md
@@ -785,8 +785,7 @@
(define_insn_and_split "movmisalign<mode>_store"
[(set (match_operand:SIDIVM 0 "memory_operand" "=W,Q,T,Q,T")
(unspec:SIDIVM [(match_operand:SIDIVM 1 "register_operand" "r,a,b,b,a")]
- UNSPEC_MISALIGNED_ACCESS))
- (clobber (match_scratch:SI 2 "=r,X,X,X,X"))]
+ UNSPEC_MISALIGNED_ACCESS))]
"TARGET_INSNS_64"
"@
#
--
1.9.3