f7685af4a5
This makes sure that an early return during this fold doesn't end up skipping later gep folds.
58 lines
2.6 KiB
LLVM
58 lines
2.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
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;; Check that -enable-loop-header-duplication at Oz enables certain types of
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;; optimizations, for example replacing the loop body w/ a call to memset. If
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;; loop idiom recognition begins to recognize unrotated loops, this test will
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;; need to be updated.
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; RUN: opt -passes='default<Oz>' -S < %s | FileCheck %s --check-prefix=NOROTATION
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; RUN: opt -passes='default<Oz>' -S -enable-loop-header-duplication < %s | FileCheck %s --check-prefix=ROTATION
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; RUN: opt -passes='default<O2>' -S < %s | FileCheck %s --check-prefix=ROTATION
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define void @test(i8* noalias nonnull align 1 %start, i8* %end) unnamed_addr {
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; NOROTATION-LABEL: define void @test(
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; NOROTATION-SAME: ptr noalias nonnull writeonly align 1 [[START:%.*]], ptr readnone [[END:%.*]]) unnamed_addr #[[ATTR0:[0-9]+]] {
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; NOROTATION-NEXT: entry:
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; NOROTATION-NEXT: br label [[LOOP_HEADER:%.*]]
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; NOROTATION: loop.header:
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; NOROTATION-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[START]], [[ENTRY:%.*]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
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; NOROTATION-NEXT: [[_12_I:%.*]] = icmp eq ptr [[PTR_IV]], [[END]]
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; NOROTATION-NEXT: br i1 [[_12_I]], label [[EXIT:%.*]], label [[LOOP_LATCH]]
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; NOROTATION: loop.latch:
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; NOROTATION-NEXT: [[PTR_IV_NEXT]] = getelementptr inbounds nuw i8, ptr [[PTR_IV]], i64 1
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; NOROTATION-NEXT: store i8 1, ptr [[PTR_IV]], align 1
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; NOROTATION-NEXT: br label [[LOOP_HEADER]]
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; NOROTATION: exit:
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; NOROTATION-NEXT: ret void
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;
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; ROTATION-LABEL: define void @test(
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; ROTATION-SAME: ptr noalias nonnull writeonly align 1 [[START:%.*]], ptr readnone [[END:%.*]]) unnamed_addr #[[ATTR0:[0-9]+]] {
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; ROTATION-NEXT: entry:
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; ROTATION-NEXT: [[_12_I1:%.*]] = icmp eq ptr [[START]], [[END]]
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; ROTATION-NEXT: br i1 [[_12_I1]], label [[EXIT:%.*]], label [[LOOP_LATCH_PREHEADER:%.*]]
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; ROTATION: loop.latch.preheader:
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; ROTATION-NEXT: [[END3:%.*]] = ptrtoint ptr [[END]] to i64
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; ROTATION-NEXT: [[START4:%.*]] = ptrtoint ptr [[START]] to i64
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; ROTATION-NEXT: [[TMP0:%.*]] = sub i64 [[END3]], [[START4]]
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; ROTATION-NEXT: tail call void @llvm.memset.p0.i64(ptr nonnull align 1 [[START]], i8 1, i64 [[TMP0]], i1 false)
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; ROTATION-NEXT: br label [[EXIT]]
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; ROTATION: exit:
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; ROTATION-NEXT: ret void
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;
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entry:
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br label %loop.header
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loop.header:
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%ptr.iv = phi i8* [ %start, %entry ], [ %ptr.iv.next, %loop.latch ]
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%_12.i = icmp eq i8* %ptr.iv, %end
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br i1 %_12.i, label %exit, label %loop.latch
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loop.latch:
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%ptr.iv.next = getelementptr inbounds i8, i8* %ptr.iv, i64 1
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store i8 1, i8* %ptr.iv, align 1
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br label %loop.header
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exit:
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ret void
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}
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