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9758242046
Just comparing constant trip counts causes LV to miss cases where the vector loop body only executes once. The motivation for this is to remove the need for unrolling to remove vector loop back-edges, if the body only executes once in more cases. Reviewed By: Ayal Differential Revision: https://reviews.llvm.org/D133017
36 lines
1.3 KiB
LLVM
36 lines
1.3 KiB
LLVM
; RUN: opt -passes=loop-vectorize -force-vector-width=8 -force-vector-interleave=1 -S %s | FileCheck --check-prefixes=CHECK,VF8UF1 %s
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; RUN: opt -passes=loop-vectorize -force-vector-width=8 -force-vector-interleave=2 -S %s | FileCheck --check-prefixes=CHECK,VF8UF2 %s
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; RUN: opt -passes=loop-vectorize -force-vector-width=16 -force-vector-interleave=1 -S %s | FileCheck --check-prefixes=CHECK,VF16UF1 %s
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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; Check if the vector loop condition can be simplified to true for a given
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; VF/IC combination.
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define void @test_tc_less_than_16(ptr %A, i64 %N) {
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; CHECK-LABEL: define void @test_tc_less_than_16(
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; VF8UF1: [[CMP:%.+]] = icmp eq i64 %index.next, %n.vec
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; VF8UF1-NEXT: br i1 [[CMP]], label %middle.block, label %vector.body
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;
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; VF8UF2: br i1 true, label %middle.block, label %vector.body
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;
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; VF16UF1: br i1 true, label %middle.block, label %vector.body
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;
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entry:
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%and = and i64 %N, 15
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br label %loop
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loop:
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%iv = phi i64 [ %and, %entry ], [ %iv.next, %loop ]
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%p.src = phi ptr [ %A, %entry ], [ %p.src.next, %loop ]
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%p.src.next = getelementptr inbounds i8, ptr %p.src, i64 1
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%l = load i8, ptr %p.src, align 1
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%add = add nsw i8 %l, 10
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store i8 %add, ptr %p.src
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%iv.next = add nsw i64 %iv, -1
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%cmp = icmp eq i64 %iv.next, 0
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br i1 %cmp, label %exit, label %loop
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exit:
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ret void
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}
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