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0428548839
Summary: When vectorizing fcmps we can trip on incorrect cast assertion when setting the FastMathFlags after generating the vectorized FCmp. This can happen if the FCmp can be folded to true or false directly. The fix here is to set the FastMathFlag using the FastMathFlagBuilder *before* creating the FCmp Instruction. This is what's done by other optimizations such as InstCombine. Added a test case which trips on cast assertion without this patch. Reviewers: Ayal, mssimpso, mkuper, gilr Reviewed by: Ayal, mssimpso Subscribers: llvm-commits, mzolotukhin Differential Revision: https://reviews.llvm.org/D36244 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310389 91177308-0d34-0410-b5e6-96231b3b80d8
26 lines
961 B
LLVM
26 lines
961 B
LLVM
; RUN: opt -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S %s | FileCheck %s
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; Avoid crashing while trying to vectorize fcmp that can be folded to vector of
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; i1 true.
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define void @test1() {
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; CHECK-LABEL: test1(
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; CHECK-LABEL: vector.body:
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; CHECK-NEXT: %index = phi i32 [ 0, %vector.ph ], [ %index.next, %vector.body ]
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; CHECK-NEXT: %broadcast.splatinsert = insertelement <4 x i32> undef, i32 %index, i32 0
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; CHECK: %induction = add <4 x i32> %broadcast.splat, <i32 0, i32 1, i32 2, i32 3>
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; CHECK: %index.next = add i32 %index, 4
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entry:
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br label %loop
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loop: ; preds = %loop, %entry
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%iv = phi i32 [ 0, %entry ], [ %ivnext, %loop ]
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%fcmp = fcmp uno float 0.000000e+00, 0.000000e+00
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%ivnext = add nsw i32 %iv, 1
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%cnd = icmp sgt i32 %iv, 142
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br i1 %cnd, label %exit, label %loop
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exit: ; preds = %loop
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ret void
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}
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