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backport: re PR tree-optimization/39804 (internal compiler error: in propagate_necessity, at tree-ssa-dce.c:754) 

2009-04-18  H.J. Lu  <hongjiu.lu@intel.com>

	Backport from mainline:
	2009-04-18  Richard Guenther  <rguenther@suse.de>

	PR middle-end/39804
	* gcc.target/i386/pr39804.c: New testcase.

From-SVN: r146315
This commit is contained in:
H.J. Lu 2009-04-18 14:54:32 +00:00 committed by H.J. Lu
parent d5f610996b
commit 94144c5ae0
2 changed files with 39 additions and 0 deletions
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8
gcc/testsuite/ChangeLog
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@ -1,3 +1,11 @@
2009-04-18 H.J. Lu <hongjiu.lu@intel.com>
Backport from mainline:
2009-04-18 Richard Guenther <rguenther@suse.de>
PR middle-end/39804
* gcc.target/i386/pr39804.c: New testcase.
2009-04-18 Eric Botcazou <ebotcazou@adacore.com>
* gcc.target/i386/pr39496.c: Compile with -mtune=i686.

31
gcc/testsuite/gcc.target/i386/pr39804.c Normal file
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/* { dg-do compile } */
/* { dg-require-effective-target ilp32 } */
/* { dg-options "-O" } */
typedef unsigned char u8;
struct __large_struct { unsigned long buf[100]; };
static inline __attribute__((always_inline)) unsigned long
__copy_from_user_inatomic(void *to, const void *from, unsigned long n)
{
unsigned long ret = 0;
asm volatile("1: mov""b"" %2,%""b""1\n" "2:\n"
".section .fixup,\"ax\"\n"
"3: mov %3,%0\n"
" xor""b"" %""b""1,%""b""1\n"
" jmp 2b\n"
".previous\n"
" .section __ex_table,\"a\"\n"
" " ".balign 4" " " "\n"
" " ".long" " " "1b" "," "3b" "\n"
" .previous\n"
: "=r" (ret), "=q"(*(u8 *)to)
: "m" ((*(struct __large_struct *)(from))), "i" (1), "0" (ret));
return ret;
}
void romchecksum(const unsigned char *rom, unsigned char c)
{
unsigned char sum;
for (sum = 0;
!__copy_from_user_inatomic(&(c), ( typeof(c) *)(rom++), sizeof(c));)
sum += c;
}