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...nt pool and not to broadcast it from a scalar. Would anyone be able to explain why it is better to load a vector from the constant pool rather than broadcast a scalar? I checked out Agner Fog's tables, but it wasn't so obvious to me... vmovaps y, m256: Uops: 1 Lat: 4 Throughput: 1 vbroadcastsd y, m64: Uops: 2 Lat: [Not or cannot be measured] Throughput: 1 Thanks in advance, Cameron -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20121106/cd47780e/attachment.html>

Hi again, Actually, I've just been looking at the existing code and the ARM solution may be over-complicated for this situation. You should be able to override EmitConstantPool directly, or possibly even just override getSectionForConstantKind in X86LinuxTargetObjectFile (and perhaps others) to return .text. Tim.

....9 .LCPI0_1: .quad 4631147119616759172 # double 42.2794408 .LCPI0_2: .long 1065353216 # float 1 .zero 4 ... movabsq $.LCPI0_1, %rax # encoding: [0x48,0xb8,A,A,A,A,A,A,A,A] # fixup A - offset: 2, value: .LCPI0_1, kind: FK_Data_8 vbroadcastsd (%rax), %ymm0 # encoding: [0xc4,0xe2,0x7d,0x19,0x00] Actually, I'm looking for a flag that can say that the whole constants pool is in code section. - Elena -----Original Message----- From: Tim Northover [mailto:t.p.northover at gmail.com] Sent: Tuesday, June 25, 2013 15:08 To: Demikh...

..."skipped\n"); + printf("%-40s", "Testing vmovsd %xmm5,(%ecx)..."); + memset(res, 0x88, 64); + memset(res + 10, 0x77, 8); + if ( stack_exec && cpu_has_avx ) + { + extern const unsigned char vmovsd_to_mem[]; + + asm volatile ( "vbroadcastsd %0, %%ymm5\n" + ".pushsection .test, \"a\", @progbits\n" + "vmovsd_to_mem: vmovsd %%xmm5, (%1)\n" + ".popsection" :: "m" (res[10]), "c" (NULL) ); + + memcpy(inst...

Hi Shahid, Thank you so much for your response. You suggested approach is what I am right now using. However, it seems that the overhead is a little bit high because we are introducing two more instructions. I was wondering if there was a cheaper way to do it. Best, Zhi On Mon, May 4, 2015 at 2:12 AM, Shahid, Asghar-ahmad < Asghar-ahmad.Shahid at amd.com> wrote: > Hi Zhi, > >