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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2013-02-28 19:09:33 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2013-02-28 19:09:33 +0000 |
| commit | 8611d4449a77ca05e808823bc966573a85da00cb (patch) | |
| tree | 948b8110ba823e8880a6445c17aaae4dd370d151 /test/Analysis | |
| parent | 279706e90e12e9418d4e8f9415d5f3ed33a99bdb (diff) | |
| download | llvm-8611d4449a77ca05e808823bc966573a85da00cb.tar.gz llvm-8611d4449a77ca05e808823bc966573a85da00cb.tar.bz2 llvm-8611d4449a77ca05e808823bc966573a85da00cb.tar.xz | |
Cost model support for lowered math builtins.
We make the cost for calling libm functions extremely high as emitting the
calls is expensive and causes spills (on x86) so performance suffers. We still
vectorize important calls like ceilf and friends on SSE4.1. and fabs.
Differential Revision: http://llvm-reviews.chandlerc.com/D466
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176287 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Analysis')
| -rw-r--r-- | test/Analysis/CostModel/X86/intrinsic-cost.ll | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/test/Analysis/CostModel/X86/intrinsic-cost.ll b/test/Analysis/CostModel/X86/intrinsic-cost.ll new file mode 100644 index 0000000000..e235a36222 --- /dev/null +++ b/test/Analysis/CostModel/X86/intrinsic-cost.ll @@ -0,0 +1,32 @@ +; RUN: opt -S -mtriple=x86_64-apple-darwin -mcpu=core2 -cost-model -analyze < %s | FileCheck %s -check-prefix=CORE2 +; RUN: opt -S -mtriple=x86_64-apple-darwin -mcpu=corei7 -cost-model -analyze < %s | FileCheck %s -check-prefix=COREI7 + +; If SSE4.1 roundps instruction is available it is cheap to lower, otherwise +; it'll be scalarized into calls which are expensive. +define void @test1(float* nocapture %f) nounwind { +vector.ph: + br label %vector.body + +vector.body: ; preds = %vector.body, %vector.ph + %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ] + %0 = getelementptr inbounds float* %f, i64 %index + %1 = bitcast float* %0 to <4 x float>* + %wide.load = load <4 x float>* %1, align 4 + %2 = call <4 x float> @llvm.ceil.v4f32(<4 x float> %wide.load) + store <4 x float> %2, <4 x float>* %1, align 4 + %index.next = add i64 %index, 4 + %3 = icmp eq i64 %index.next, 1024 + br i1 %3, label %for.end, label %vector.body + +for.end: ; preds = %vector.body + ret void + +; CORE2: Printing analysis 'Cost Model Analysis' for function 'test1': +; CORE2: Cost Model: Found an estimated cost of 400 for instruction: %2 = call <4 x float> @llvm.ceil.v4f32(<4 x float> %wide.load) + +; COREI7: Printing analysis 'Cost Model Analysis' for function 'test1': +; COREI7: Cost Model: Found an estimated cost of 1 for instruction: %2 = call <4 x float> @llvm.ceil.v4f32(<4 x float> %wide.load) + +} + +declare <4 x float> @llvm.ceil.v4f32(<4 x float>) nounwind readnone |