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

and v4i64->v4f64.

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

<rdar://problem/16381225>

llvm-svn: 204884

1 files changed, 26 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LoopVectorize/X86/uint64_to_fp64-cost-model.ll b/llvm/test/Transforms/LoopVectorize/X86/uint64_to_fp64-cost-model.ll
new file mode 100644
index 00000000000..86c32b2d2ee
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/X86/uint64_to_fp64-cost-model.ll
@@ -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
+}