On x86, I got
[...@gnu-6 strcasestr]$ cat /tmp/foo.c
#include <nmmintrin.h>
__m128i load (char *);
char *
foo (const unsigned char *s1, const unsigned char *s2,
int bmsk, __m128i frag2)
{
int len = 0;
char *p1 = (char *) s1;
char *p2 = (char *) s2;
__m128i frag1, fruc, mask;
int cmp_c, cmp_s;
if( !p2[0]) return (char *) s1;
if( !p1[0] ) return NULL;
if( p2[1]) frag2 = load (p2);
frag1 = load (p1);
fruc = _mm_loadu_si128 ((__m128i *) s1);
mask = _mm_cmpistrm(fruc, frag2, 0x44);
frag2 = _mm_blendv_epi8(frag2, mask, mask);
frag1 = _mm_blendv_epi8(frag1, mask, mask);
cmp_c = _mm_cmpistrc(frag2, frag1, 0x0c);
cmp_s = _mm_cmpistrs(frag2, frag1, 0x0c);
if( cmp_s & cmp_c )
__asm("bsfl %[bmsk], %[len]" : [len] "=r" (len) : [bmsk] "r" (bmsk) );
return NULL;
}
[...@gnu-6 strcasestr]$ /usr/gcc-4.4-ix86/bin/gcc -msse4 -S /tmp/foo.c -O2
/tmp/foo.c: In function ‘foo’:
/tmp/foo.c:27: error: unable to find a register to spill in class
‘SSE_FIRST_REG’
/tmp/foo.c:27: error: this is the insn:
(insn 89 35 40 6
/usr/gcc-4.4-ix86/lib/gcc/x86_64-unknown-linux-gnu/4.4.1/include/smmintrin.h:62
(parallel [
(set (reg:V16QI 24 xmm3 [orig:61 D.6187 ] [61])
(unspec:V16QI [
(reg:V16QI 24 xmm3 [77])
(reg:V16QI 22 xmm1 [orig:63 D.6178 ] [63])
(const_int 68 [0x44])
] 145))
(set (reg:CC 17 flags)
(unspec:CC [
(reg:V16QI 24 xmm3 [77])
(reg:V16QI 22 xmm1 [orig:63 D.6178 ] [63])
(const_int 68 [0x44])
] 145))
]) 1840 {sse4_2_pcmpistrm} (expr_list:REG_DEAD (reg:V16QI 24 xmm3 [77])
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil))))
/tmp/foo.c:27: confused by earlier errors, bailing out
[...@gnu-6 strcasestr]$
--
Summary: unable to find a register to spill in class
‘SSE_FIRST_REG’
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: hjl dot tools at gmail dot com
GCC target triplet: x86
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40470
