1662c200a5
Make this dependent only on the minsize attribute and drop the pipeline handling. Rename the enable-loop-header-duplication option to enable-loop-header-duplication-at-minsize to clarify that it controls header duplication at minsize only (in other cases it is enabled by default, independently of this option).
57 lines
2.7 KiB
LLVM
57 lines
2.7 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-minsize at Oz enables certain
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;; types of optimizations, for example replacing the loop body w/ a call to
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;; memset. If loop idiom recognition begins to recognize unrotated loops, this
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;; test will 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-at-minsize < %s | FileCheck %s --check-prefix=ROTATION
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define void @test(i8* noalias nonnull align 1 %start, i8* %end) minsize {
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; NOROTATION-LABEL: define void @test(
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; NOROTATION-SAME: ptr noalias nonnull writeonly align 1 captures(address) [[START:%.*]], ptr readnone captures(address) [[END:%.*]]) local_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 captures(address) [[START:%.*]], ptr readnone captures(address) [[END:%.*]]) local_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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