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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/46012] New: 256bit vectorizer failed on int->double Date: Thu, 14 Oct 2010 08:54:00 -0000 [thread overview] Message-ID: <bug-46012-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46012 Summary: 256bit vectorizer failed on int->double Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: enhancement Priority: P3 Component: tree-optimization AssignedTo: unassigned@gcc.gnu.org ReportedBy: hjl.tools@gmail.com CC: rguenth@gcc.gnu.org For --- double a[1024]; float b[1024]; int c[1024]; void dependence_distance_4_mixed_0 (void) { int i; for (i = 0; i < 1020; ++i) a[i + 4] = a[i] + a[i + 4] + c[i]; } --- with -O3 -ffast-math -mavx, vect256 branch generates: .L2: vmovapd a(%rax,%rax), %ymm0 vcvtdq2pd c(%rax), %ymm1 vaddpd a+32(%rax,%rax), %ymm0, %ymm0 vaddpd %ymm1, %ymm0, %ymm0 vmovapd %ymm0, a+32(%rax,%rax) addq $16, %rax cmpq $4080, %rax jne .L2 Trunk at revision 165455 generates .L2: vmovapd 16(%rax), %xmm2 vaddpd -16(%rax), %xmm2, %xmm2 vmovdqa (%rdx), %xmm0 addq $16, %rdx vpshufd $238, %xmm0, %xmm1 vcvtdq2pd %xmm0, %xmm0 vcvtdq2pd %xmm1, %xmm1 vaddpd %xmm1, %xmm2, %xmm1 vmovapd (%rax), %xmm2 vaddpd -32(%rax), %xmm2, %xmm2 vmovapd %xmm1, 16(%rax) vaddpd %xmm0, %xmm2, %xmm0 vmovapd %xmm0, (%rax) addq $32, %rax cmpq %rax, %rcx jne .L2
next reply other threads:[~2010-10-14 8:54 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-10-14 8:54 hjl.tools at gmail dot com [this message] 2010-10-14 9:02 ` [Bug tree-optimization/46012] " rguenth at gcc dot gnu.org 2012-07-13 8:47 ` rguenth at gcc dot gnu.org
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