[llvm] r204880 - X86: Correct vectorization cost model for v8f32->v8i8.

[Jim Grosbach]

Author: grosbach
Date: Wed Mar 26 19:04:11 2014
New Revision: 204880

URL: http://llvm.org/viewvc/llvm-project?rev=204880&view=rev
Log:
X86: Correct vectorization cost model for v8f32->v8i8.

Fix the cost model to reflect the reality of our codegen.

rdar://16370633

Added:
    llvm/trunk/test/Transforms/LoopVectorize/X86/fp_to_sint8-cost-model.ll
Modified:
    llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp

Modified: llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp?rev=204880&r1=204879&r2=204880&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86TargetTransformInfo.cpp Wed Mar 26 19:04:11 2014
@@ -513,7 +513,7 @@ unsigned X86TTI::getCastInstrCost(unsign
     { ISD::UINT_TO_FP,  MVT::v4f64, MVT::v4i16, 2 },
     { ISD::UINT_TO_FP,  MVT::v4f64, MVT::v4i32, 6 },
 
-    { ISD::FP_TO_SINT,  MVT::v8i8,  MVT::v8f32, 1 },
+    { ISD::FP_TO_SINT,  MVT::v8i8,  MVT::v8f32, 7 },
     { ISD::FP_TO_SINT,  MVT::v4i8,  MVT::v4f32, 1 },
   };
 

Added: llvm/trunk/test/Transforms/LoopVectorize/X86/fp_to_sint8-cost-model.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopVectorize/X86/fp_to_sint8-cost-model.ll?rev=204880&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/LoopVectorize/X86/fp_to_sint8-cost-model.ll (added)
+++ llvm/trunk/test/Transforms/LoopVectorize/X86/fp_to_sint8-cost-model.ll Wed Mar 26 19:04:11 2014
@@ -0,0 +1,24 @@
+; RUN: opt < %s  -loop-vectorize -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7-avx -S -debug-only=loop-vectorize 2>&1 | FileCheck %s
+
+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 7 for VF 8 For instruction:   %conv = fptosi float %tmp to i8
+define void @float_to_sint8_cost(i8* noalias nocapture %a, float* 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 float* %b, i64 %indvars.iv
+  %tmp = load float* %arrayidx, align 4
+  %conv = fptosi float %tmp to i8
+  %arrayidx2 = getelementptr inbounds i8* %a, i64 %indvars.iv
+  store i8 %conv, i8* %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
+}