From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 28684 invoked by alias); 17 Jun 2009 20:34:54 -0000 Received: (qmail 28534 invoked by uid 48); 17 Jun 2009 20:34:30 -0000 Date: Wed, 17 Jun 2009 20:34:00 -0000 Message-ID: <20090617203430.28533.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug target/40470] unable to find a register to spill in class ‘SSE_FIRST_REG’ In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "hjl dot tools at gmail dot com" Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2009-06/txt/msg01241.txt.bz2 ------- Comment #6 from hjl dot tools at gmail dot com 2009-06-17 20:34 ------- (In reply to comment #4) > Another testcase: > > [hjl@gnu-6 gcc]$ cat /tmp/pr40470-3.c > #include > __m128i load (char *); > char * > foo (char *p1, char *p2, > int bmsk, __m128i mask1, __m128i mask2) > { > int len = 0; > __m128i frag1, frag2; > int cmp_s; > if( !p2[0]) return p1; > if( !p1[0] ) return NULL; > frag2 = load (p2); > frag1 = load (p1); > frag2 = _mm_blendv_epi8(frag2, mask2, mask1); > frag1 = _mm_blendv_epi8(frag1, mask1, mask2); > cmp_s = _mm_cmpistrs(frag2, frag1, 0x0c); > if( cmp_s ) > __asm("bsfl %[bmsk], %[len]" : [len] "=r" (len) : [bmsk] "r" (bmsk) ); > return p1 + len; > } > [hjl@gnu-6 gcc]$ ./xgcc -B./ -O2 -msse4 /tmp/pr40470-3.c -S > -fno-asynchronous-unwind-tables > /tmp/pr40470-3.c: In function ‘foo’: > /tmp/pr40470-3.c:20:1: error: unable to find a register to spill in class > ‘SSE_FIRST_REG’ > /tmp/pr40470-3.c:20:1: error: this is the insn: > (insn 30 87 32 4 ./include/smmintrin.h:62 (set (reg:V16QI 25 xmm4 [82]) > (unspec:V16QI [ > (subreg:V16QI (reg/v:V2DI 25 xmm4 [orig:60 frag2 ] [60]) 0) > (reg:V16QI 22 xmm1 [orig:64 D.8164 ] [64]) > (reg:V16QI 23 xmm2 [orig:63 D.8165 ] [63]) > ] 134)) 1791 {*sse4_1_pblendvb} (expr_list:REG_DEAD (reg/v:V2DI 25 > xmm4 [orig:60 frag2 ] [60]) > (nil))) > /tmp/pr40470-3.c:20:1: internal compiler error: in spill_failure, at > reload1.c:2094 > Please submit a full bug report, > with preprocessed source if appropriate. > See for instructions. > [hjl@gnu-6 gcc]$ Even with my patch, GCSE removes xmm0 in those patterns and makes it harder for IRA/reload to handle. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40470