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[X86][Vectorizer Cost Model] Correct vectorization cost model for v2i64->v2f64

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and v4i64->v4f64.

The new costs match what we did for SSE2 and reflect the reality of our codegen.

<rdar://problem/16381225>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204884 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Quentin Colombet 2014-03-27 00:52:16 +00:00
parent e459f72ee0
commit 566abecc9f
2 changed files with 28 additions and 0 deletions
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2
lib/Target/X86/X86TargetTransformInfo.cpp
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@ -512,6 +512,8 @@ unsigned X86TTI::getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src) const {
{ ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i8, 2 },
{ ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i16, 2 },
{ ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i32, 6 },
{ ISD::UINT_TO_FP, MVT::v2f64, MVT::v2i64, 2*10 },
{ ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i64, 4*10 },
{ ISD::FP_TO_SINT, MVT::v8i8, MVT::v8f32, 7 },
{ ISD::FP_TO_SINT, MVT::v4i8, MVT::v4f32, 1 },

26
test/Transforms/LoopVectorize/X86/uint64_to_fp64-cost-model.ll Normal file
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@ -0,0 +1,26 @@
; RUN: opt < %s -loop-vectorize -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7-avx -S -debug-only=loop-vectorize 2>&1 | FileCheck %s
; REQUIRES: asserts
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"
; CHECK: cost of 20 for VF 2 For instruction: %conv = uitofp i64 %tmp to double
; CHECK: cost of 40 for VF 4 For instruction: %conv = uitofp i64 %tmp to double
define void @uint64_to_double_cost(i64* noalias nocapture %a, double* noalias nocapture readonly %b) nounwind {
entry:
br label %for.body
for.body:
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i64* %a, i64 %indvars.iv
%tmp = load i64* %arrayidx, align 4
%conv = uitofp i64 %tmp to double
%arrayidx2 = getelementptr inbounds double* %b, i64 %indvars.iv
store double %conv, double* %arrayidx2, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, 256
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}