37 lines
1.5 KiB
LLVM
37 lines
1.5 KiB
LLVM
; RUN: opt < %s -S -loop-unroll -unroll-threshold=150 | FileCheck %s
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;
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; Verify that trunc i64 to i32 is considered free by loop unrolling
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; heuristics when i32 is a native type.
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; This should result in full unrolling this loop with size=7, TC=19.
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; If the trunc were not free we would have 8*19=152 > 150.
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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"
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; Check that for.body was unrolled 19 times.
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; CHECK-LABEL: @test(
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; CHECK: %0 = load
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; CHECK: %conv = sext i8 %0 to i32
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; CHECK: %add.1 = add nsw i32 %conv.1, %conv
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; CHECK: %add.18 = add nsw i32 %conv.18, %add.17
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; CHECK: ret i32 %add.18
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define i32 @test(i8* %arr) nounwind uwtable readnone {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ]
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%arrayidx = getelementptr inbounds i8* %arr, i64 %indvars.iv
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%0 = load i8* %arrayidx, align 1
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%conv = sext i8 %0 to i32
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%add = add nsw i32 %conv, %sum.02
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv1 = trunc i64 %indvars.iv.next to i32
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%exitcond2 = icmp eq i32 %lftr.wideiv1, 19
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br i1 %exitcond2, label %for.end, label %for.body
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for.end: ; preds = %for.body
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%add.lcssa = phi i32 [ %add, %for.body ]
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ret i32 %add.lcssa
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}
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