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73f8eff19e
The loop vectorizer preserves wrapping, exact, and fast-math properties of scalar instructions. This patch adds a convenience method to make that operation easier because we need to do this in the loop vectorizer, SLP vectorizer, and possibly other places. Although this is a 'no functional change' patch, I've added a testcase to verify that the exact flag is preserved by the loop vectorizer. The wrapping and fast-math flags are already checked in existing testcases. Differential Revision: http://reviews.llvm.org/D5138 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216886 91177308-0d34-0410-b5e6-96231b3b80d8
25 lines
682 B
LLVM
25 lines
682 B
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -S | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.9.0"
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; CHECK-LABEL: @lshr_exact(
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; CHECK: lshr exact <4 x i32>
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define void @lshr_exact(i32* %x) {
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entry:
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br label %for.body
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for.body:
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%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i32* %x, i64 %iv
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%0 = load i32* %arrayidx, align 4
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%conv1 = lshr exact i32 %0, 1
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store i32 %conv1, i32* %arrayidx, align 4
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%iv.next = add nuw nsw i64 %iv, 1
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%exitcond = icmp eq i64 %iv.next, 256
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret void
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}
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