[llvm-bugs] [Bug 27291] New: [X86] Failure to fold v2i32 load into CVTDQ2PD

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Apr 8 09:24:22 PDT 2016


            Bug ID: 27291
           Summary: [X86] Failure to fold v2i32 load into CVTDQ2PD
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: llvm-bugs at lists.llvm.org, spatel+llvm at rotateright.com
    Classification: Unclassified

define <2 x double> @cvt_2i32_2f64(<2 x i32>* %p, <2 x double>* %q) {
  %n = load <2 x i32>, <2 x i32>* %p
  %z = sitofp <2 x i32> %n to <2 x double>
  ret <2 x double> %z

llc -mtriple=x86_64-unknown -mcpu=btver2:

        vmovq   (%rdi), %xmm0           # xmm0 = mem[0],zero
        vcvtdq2pd       %xmm0, %xmm0

(v)cvtdq2pd supports either an XMM register or a 64-bit memory location as the
source parameter but it appears the patterns are missing to fold the 64-bit

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