derek.holloway
7502bf64a4
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105 lines
3.3 KiB
LLVM
105 lines
3.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=simplifycfg -S | FileCheck %s
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declare void @bar()
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declare i1 @uniform_result(i1 %c)
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define void @dont_merge_cbranches1(i32 %V) {
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; CHECK-LABEL: @dont_merge_cbranches1(
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; CHECK-NEXT: [[DIVERGENT_COND:%.*]] = icmp ne i32 [[V:%.*]], 0
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; CHECK-NEXT: [[UNIFORM_COND:%.*]] = call i1 @uniform_result(i1 [[DIVERGENT_COND]])
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; CHECK-NEXT: br i1 [[UNIFORM_COND]], label [[BB2:%.*]], label [[EXIT:%.*]], !prof [[PROF0:![0-9]+]]
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; CHECK: bb2:
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; CHECK-NEXT: br i1 [[DIVERGENT_COND]], label [[BB3:%.*]], label [[EXIT]]
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; CHECK: bb3:
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; CHECK-NEXT: call void @bar()
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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%divergent_cond = icmp ne i32 %V, 0
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%uniform_cond = call i1 @uniform_result(i1 %divergent_cond)
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br i1 %uniform_cond, label %bb2, label %exit, !prof !0
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bb2:
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br i1 %divergent_cond, label %bb3, label %exit
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bb3:
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call void @bar( )
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br label %exit
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exit:
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ret void
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}
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define void @dont_merge_cbranches2(i32 %V) {
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; CHECK-LABEL: @dont_merge_cbranches2(
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; CHECK-NEXT: [[DIVERGENT_COND:%.*]] = icmp ne i32 [[V:%.*]], 0
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; CHECK-NEXT: [[UNIFORM_COND:%.*]] = call i1 @uniform_result(i1 [[DIVERGENT_COND]])
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; CHECK-NEXT: br i1 [[UNIFORM_COND]], label [[EXIT:%.*]], label [[BB2:%.*]], !prof [[PROF1:![0-9]+]]
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; CHECK: bb2:
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; CHECK-NEXT: br i1 [[DIVERGENT_COND]], label [[BB3:%.*]], label [[EXIT]]
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; CHECK: bb3:
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; CHECK-NEXT: call void @bar()
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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%divergent_cond = icmp ne i32 %V, 0
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%uniform_cond = call i1 @uniform_result(i1 %divergent_cond)
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br i1 %uniform_cond, label %exit, label %bb2, !prof !1
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bb2:
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br i1 %divergent_cond, label %bb3, label %exit
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bb3:
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call void @bar( )
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br label %exit
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exit:
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ret void
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}
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define void @merge_cbranches(i32 %V) {
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; CHECK-LABEL: @merge_cbranches(
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; CHECK-NEXT: [[DIVERGENT_COND:%.*]] = icmp ne i32 [[V:%.*]], 0
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; CHECK-NEXT: [[UNIFORM_COND:%.*]] = call i1 @uniform_result(i1 [[DIVERGENT_COND]])
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; CHECK-NEXT: [[DIVERGENT_COND_NOT:%.*]] = xor i1 [[DIVERGENT_COND]], true
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; CHECK-NEXT: [[BRMERGE:%.*]] = select i1 [[UNIFORM_COND]], i1 true, i1 [[DIVERGENT_COND_NOT]]
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; CHECK-NEXT: br i1 [[BRMERGE]], label [[EXIT:%.*]], label [[BB3:%.*]], !prof [[PROF2:![0-9]+]]
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; CHECK: bb3:
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; CHECK-NEXT: call void @bar()
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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%divergent_cond = icmp ne i32 %V, 0
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%uniform_cond = call i1 @uniform_result(i1 %divergent_cond)
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br i1 %uniform_cond, label %exit, label %bb2, !prof !2
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bb2:
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br i1 %divergent_cond, label %bb3, label %exit
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bb3:
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call void @bar( )
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br label %exit
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exit:
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ret void
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}
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define void @uint32_overflow_test(i1 %arg, i1 %arg1) {
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; CHECK-LABEL: @uint32_overflow_test(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: [[BRMERGE:%.*]] = select i1 [[ARG:%.*]], i1 true, i1 [[ARG1:%.*]]
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; CHECK-NEXT: ret void
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;
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bb:
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br i1 %arg, label %bb4, label %bb2, !prof !3
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bb2:
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br i1 %arg1, label %bb4, label %bb3
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bb3:
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br label %bb4
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bb4:
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ret void
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}
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!0 = !{!"branch_weights", i32 1, i32 1000}
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!1 = !{!"branch_weights", i32 1000, i32 1}
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!2 = !{!"branch_weights", i32 3, i32 2}
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!3 = !{!"branch_weights", i32 -258677585, i32 -1212131848}
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