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9135c0f7b3
When allowed, we can hoist a division out of a loop in favor of a multiplication by the reciprocal. Fixes PR32157. Patch by vit9696! Differential Revision: https://reviews.llvm.org/D30819 llvm-svn: 299911
35 lines
922 B
LLVM
35 lines
922 B
LLVM
; RUN: opt -licm -S < %s | FileCheck %s
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; Function Attrs: noinline norecurse nounwind readnone ssp uwtable
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define zeroext i1 @f(double %v) #0 {
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entry:
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; CHECK-LABEL: @f(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: fdiv fast double 1.000000e+00, %v
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br label %loop
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loop: ; preds = %entry, %loop
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%v3 = phi i32 [ 0, %entry ], [ %v11, %loop ]
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%v4 = phi i32 [ 0, %entry ], [ %v12, %loop ]
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%v5 = uitofp i32 %v4 to double
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; CHECK-LABEL: loop:
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; CHECK: fmul fast double
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; CHECK-NOT: fdiv
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%v6 = fdiv fast double %v5, %v
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%v7 = fptoui double %v6 to i64
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%v8 = and i64 %v7, 1
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%v9 = xor i64 %v8, 1
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%v10 = trunc i64 %v9 to i32
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%v11 = add i32 %v10, %v3
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%v12 = add nuw i32 %v4, 1
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%v13 = icmp eq i32 %v12, -1
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br i1 %v13, label %end, label %loop
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end: ; preds = %loop
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%v15 = phi i32 [ %v11, %loop ]
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%v16 = icmp ne i32 %v15, 0
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ret i1 %v16
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}
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