derek.holloway
7502bf64a4
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102 lines
2.2 KiB
LLVM
102 lines
2.2 KiB
LLVM
; RUN: opt < %s -passes='simple-loop-unswitch<nontrivial>' -S 2>&1 | FileCheck %s
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; RUN: opt < %s -passes='loop-mssa(simple-loop-unswitch<nontrivial>)' -S 2>&1 | FileCheck %s
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;
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; Checking that (dead) blocks from inner loop are deleted after unswitch.
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;
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declare void @foo()
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; CHECK-LABEL: @Test
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define void @Test(i32) {
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entry:
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br label %outer
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outer:
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%oi = phi i32 [ 0, %entry ], [ %oinc, %outer_continue]
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br label %inner
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inner:
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%ii = phi i32 [ 0, %outer ], [ %iinc, %continue]
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call void @foo()
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switch i32 %0, label %get_out2 [
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i32 0, label %continue
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i32 1, label %case1
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i32 2, label %get_out
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]
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;
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; since we unswitch on the above switch, %case1 and %continue blocks
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; become dead in the original loop
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;
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; CHECK-NOT: case1:
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case1:
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br label %continue
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; CHECK-NOT: {{^}}continue:
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continue:
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%iinc = add i32 %ii, 1
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%icmp = icmp eq i32 %ii, 100
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br i1 %icmp, label %inner, label %outer_continue
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outer_continue:
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%oinc = add i32 %oi, 1
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%ocmp = icmp eq i32 %oi, 100
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br i1 %ocmp, label %outer, label %get_out
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get_out:
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ret void
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get_out2:
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unreachable
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}
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;
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; This comes from PR38778
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; CHECK-LABEL: @Test2
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define void @Test2(i32, i1 %arg) {
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header:
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br label %loop
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loop:
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switch i32 %0, label %continue [
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i32 -2147483648, label %check
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i32 98, label %guarded1
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i32 99, label %guarded2
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]
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; CHECK-NOT: {{^}}guarded1:
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guarded1:
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br i1 %arg, label %continue, label %leave
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guarded2:
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br label %continue
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check:
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%val = add i32 0, 1
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br i1 %arg, label %continue, label %leave
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continue:
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br label %loop
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leave:
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%local = phi i32 [ 0, %guarded1 ], [ %val, %check ]
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ret void
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}
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;
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; Yet another test from PR38778
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;
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; CHECK-LABEL: @Test3
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define void @Test3(i32, i1 %arg) {
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header:
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br label %outer
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outer:
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%bad_input.i = icmp eq i32 %0, -2147483648
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br label %inner
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inner:
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br i1 %bad_input.i, label %overflow, label %switchme
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overflow:
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br label %continue
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switchme:
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switch i32 %0, label %continue [
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i32 88, label %go_out
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i32 99, label %case2
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]
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; CHECK-NOT: {{^}}case2:
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case2:
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br label %continue
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continue:
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%local_11_92 = phi i32 [ 0, %switchme ], [ 18, %case2 ], [ 0, %overflow ]
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br i1 %arg, label %outer, label %inner
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go_out:
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unreachable
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}
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