; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
; RUN: opt -mtriple=amdgcn-- -passes='default<O3>' -S %s | FileCheck %s
; Check that loop unswitch happened and condition hoisted out of the loop.
; Condition is uniform so even targets with divergence should perform unswitching.
; This fails with the new pass manager:
; https://bugs.llvm.org/show_bug.cgi?id=48819
; The correct behaviour (allow uniform non-trivial branches to be
; unswitched on all targets) requires access to the function-level
; divergence analysis from a loop transform, which is currently not
; supported in the new pass manager.
; SHOULDBE-LABEL: {{^}}define amdgpu_kernel void @uniform_unswitch
; SHOULDBE: entry:
; SHOULDBE-NEXT: [[LOOP_COND:%[a-z0-9]+]] = icmp
; SHOULDBE-NEXT: [[IF_COND:%[a-z0-9]+]] = icmp eq i32 %x, 123456
; SHOULDBE-NEXT: and i1 [[LOOP_COND]], [[IF_COND]]
; SHOULDBE-NEXT: br i1
define amdgpu_kernel void @uniform_unswitch(ptr nocapture %out, i32 %n, i32 %x) {
; CHECK-LABEL: define amdgpu_kernel void @uniform_unswitch(
; CHECK-SAME: ptr nocapture writeonly [[OUT:%.*]], i32 [[N:%.*]], i32 [[X:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[OUT_GLOBAL:%.*]] = addrspacecast ptr [[OUT]] to ptr addrspace(1)
; CHECK-NEXT: [[CMP6:%.*]] = icmp sgt i32 [[N]], 0
; CHECK-NEXT: br i1 [[CMP6]], label [[FOR_BODY_LR_PH:%.*]], label [[FOR_COND_CLEANUP:%.*]]
; CHECK: for.body.lr.ph:
; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i32 [[X]], 123456
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.cond.cleanup:
; CHECK-NEXT: ret void
; CHECK: for.body:
; CHECK-NEXT: [[I_07:%.*]] = phi i32 [ 0, [[FOR_BODY_LR_PH]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ]
; CHECK-NEXT: br i1 [[CMP1]], label [[IF_THEN:%.*]], label [[FOR_INC]]
; CHECK: if.then:
; CHECK-NEXT: [[TMP0:%.*]] = zext nneg i32 [[I_07]] to i64
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr addrspace(1) [[OUT_GLOBAL]], i64 [[TMP0]]
; CHECK-NEXT: store i32 [[I_07]], ptr addrspace(1) [[ARRAYIDX]], align 4
; CHECK-NEXT: br label [[FOR_INC]]
; CHECK: for.inc:
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I_07]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i32 [[INC]], [[N]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]]
;
entry:
%cmp6 = icmp sgt i32 %n, 0
br i1 %cmp6, label %for.body.lr.ph, label %for.cond.cleanup
for.body.lr.ph: ; preds = %entry
%cmp1 = icmp eq i32 %x, 123456
br label %for.body
for.cond.cleanup.loopexit: ; preds = %for.inc
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
ret void
for.body: ; preds = %for.inc, %for.body.lr.ph
%i.07 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.inc ]
br i1 %cmp1, label %if.then, label %for.inc
if.then: ; preds = %for.body
%arrayidx = getelementptr inbounds i32, ptr %out, i32 %i.07
store i32 %i.07, ptr %arrayidx, align 4
br label %for.inc
for.inc: ; preds = %for.body, %if.then
%inc = add nuw nsw i32 %i.07, 1
%exitcond = icmp eq i32 %inc, %n
br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body
}
declare i32 @llvm.amdgcn.workitem.id.x() #0
attributes #0 = { nounwind readnone }
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