derek.holloway
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73 lines
3.2 KiB
LLVM
73 lines
3.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=loop-rotate -S | FileCheck %s
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; LoopRotate restructures a loop so the exit test appears at the end of the
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; loop body rather than the beginning. This test ensures the pass does not
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; rotate a loop whose header contains a convergence.loop token that guards a
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; convergent operation. Rotating the header would place the exit test before
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; the convergence token, which breaks the convergence contract and enables
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; later passes to collapse the loop into straight-line code.
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;
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; This is one of three sibling tests (LoopRotate, IndVarSimplify,
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; SimpleLoopUnswitch) that each guard against a pass moving or removing the
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; exit condition of a loop with a convergent operation, which can change the
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; set of active threads inside the loop. See https://godbolt.org/z/K1a8xW1TE
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; for the problematic pass pipeline and
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; https://github.com/llvm/llvm-project/issues/180621 for full context.
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define void @convergent_loop(i32 %tid, ptr %array) #0 {
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; CHECK-LABEL: @convergent_loop(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TOK_ENTRY:%.*]] = call token @llvm.experimental.convergence.entry()
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; CHECK-NEXT: br label [[FOR_COND:%.*]]
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; CHECK: for.cond:
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; CHECK-NEXT: [[I:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_BODY:%.*]] ]
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; CHECK-NEXT: [[TOK_LOOP:%.*]] = call token @llvm.experimental.convergence.loop() [ "convergencectrl"(token [[TOK_ENTRY]]) ]
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; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[I]], 8
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; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_END_LOOPEXIT:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i32 [[I]], [[TID:%.*]]
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; CHECK-NEXT: [[INC]] = add nuw i32 [[I]], 1
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; CHECK-NEXT: br i1 [[CMP1]], label [[IF_THEN:%.*]], label [[FOR_COND]]
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; CHECK: if.then:
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; CHECK-NEXT: [[WAVE:%.*]] = call i32 @llvm.dx.wave.reduce.umax.i32(i32 [[TID]]) [ "convergencectrl"(token [[TOK_LOOP]]) ]
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; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, ptr [[ARRAY:%.*]], i32 [[TID]]
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; CHECK-NEXT: store i32 [[WAVE]], ptr [[GEP]], align 4
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; CHECK-NEXT: br label [[FOR_END:%.*]]
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; CHECK: for.end.loopexit:
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; CHECK-NEXT: br label [[FOR_END]]
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; CHECK: for.end:
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; CHECK-NEXT: ret void
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;
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entry:
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%tok.entry = call token @llvm.experimental.convergence.entry()
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br label %for.cond
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for.cond:
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%i = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%tok.loop = call token @llvm.experimental.convergence.loop() [ "convergencectrl"(token %tok.entry) ]
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%cmp = icmp ult i32 %i, 8
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br i1 %cmp, label %for.body, label %for.end
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for.body:
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%cmp1 = icmp eq i32 %i, %tid
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%inc = add nuw i32 %i, 1
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br i1 %cmp1, label %if.then, label %for.cond
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if.then:
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%wave = call i32 @llvm.dx.wave.reduce.umax.i32(i32 %tid) [ "convergencectrl"(token %tok.loop) ]
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%gep = getelementptr inbounds i32, ptr %array, i32 %tid
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store i32 %wave, ptr %gep, align 4
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br label %for.end
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for.end:
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ret void
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}
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declare token @llvm.experimental.convergence.entry() #1
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declare token @llvm.experimental.convergence.loop() #1
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declare i32 @llvm.dx.wave.reduce.umax.i32(i32) #1
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attributes #0 = { convergent mustprogress nounwind "no-trapping-math"="true" }
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attributes #1 = { convergent }
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