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https://github.com/RPCS3/llvm-mirror.git
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a08d5101e6
This patch introduces a codegen-only instruction currently named br_unless, which makes it convenient to implement ReverseBranchCondition and re-enable the MachineBlockPlacement pass. Then in a late pass, it lowers br_unless back into br_if. Differential Revision: http://reviews.llvm.org/D14995 llvm-svn: 254826
446 lines
9.4 KiB
LLVM
446 lines
9.4 KiB
LLVM
; RUN: llc < %s -asm-verbose=false -disable-block-placement | FileCheck %s
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; RUN: llc < %s -asm-verbose=false | FileCheck -check-prefix=OPT %s
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; Test the CFG stackifier pass.
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target datalayout = "e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-unknown"
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declare void @something()
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; Test that loops are made contiguous, even in the presence of split backedges.
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; CHECK-LABEL: test0:
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; CHECK: loop
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; CHECK: i32.add
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; CHECK-NOT: br
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; CHECK: br_if
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; CHECK-NOT: br
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; CHECK: call
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; CHECK: br BB0_1{{$}}
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; CHECK: return{{$}}
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; OPT-LABEL: test0:
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; OPT: loop
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; OPT: i32.add
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; OPT-NOT: br
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; OPT: br_if
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; OPT-NOT: br
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; OPT: call
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; OPT: br BB0_1{{$}}
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; OPT: return{{$}}
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define void @test0(i32 %n) {
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entry:
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br label %header
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header:
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%i = phi i32 [ 0, %entry ], [ %i.next, %back ]
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%i.next = add i32 %i, 1
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%c = icmp slt i32 %i.next, %n
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br i1 %c, label %back, label %exit
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exit:
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ret void
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back:
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call void @something()
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br label %header
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}
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; Same as test0, but the branch condition is reversed.
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; CHECK-LABEL: test1:
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; CHECK: loop
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; CHECK: i32.add
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; CHECK-NOT: br
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; CHECK: br_if
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; CHECK-NOT: br
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; CHECK: call
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; CHECK: br BB1_1{{$}}
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; CHECK: return{{$}}
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; OPT-LABEL: test1:
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; OPT: loop
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; OPT: i32.add
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; OPT-NOT: br
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; OPT: br_if
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; OPT-NOT: br
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; OPT: call
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; OPT: br BB1_1{{$}}
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; OPT: return{{$}}
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define void @test1(i32 %n) {
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entry:
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br label %header
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header:
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%i = phi i32 [ 0, %entry ], [ %i.next, %back ]
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%i.next = add i32 %i, 1
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%c = icmp sge i32 %i.next, %n
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br i1 %c, label %exit, label %back
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exit:
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ret void
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back:
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call void @something()
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br label %header
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}
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; Test that a simple loop is handled as expected.
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; CHECK-LABEL: test2:
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; CHECK: block BB2_2{{$}}
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; CHECK: br_if {{.*}}, BB2_2{{$}}
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; CHECK: BB2_1:
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; CHECK: br_if ${{[0-9]+}}, BB2_1{{$}}
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; CHECK: BB2_2:
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; CHECK: return{{$}}
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; OPT-LABEL: test2:
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; OPT: block BB2_2{{$}}
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; OPT: br_if {{.*}}, BB2_2{{$}}
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; OPT: BB2_1:
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; OPT: br_if ${{[0-9]+}}, BB2_1{{$}}
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; OPT: BB2_2:
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; OPT: return{{$}}
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define void @test2(double* nocapture %p, i32 %n) {
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entry:
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%cmp.4 = icmp sgt i32 %n, 0
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br i1 %cmp.4, label %for.body.preheader, label %for.end
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for.body.preheader:
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br label %for.body
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for.body:
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%i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
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%arrayidx = getelementptr inbounds double, double* %p, i32 %i.05
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%0 = load double, double* %arrayidx, align 8
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%mul = fmul double %0, 3.200000e+00
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store double %mul, double* %arrayidx, align 8
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%inc = add nuw nsw i32 %i.05, 1
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%exitcond = icmp eq i32 %inc, %n
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br i1 %exitcond, label %for.end.loopexit, label %for.body
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for.end.loopexit:
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br label %for.end
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for.end:
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ret void
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}
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; CHECK-LABEL: doublediamond:
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; CHECK: block BB3_5{{$}}
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; CHECK: block BB3_2{{$}}
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; CHECK: br_if $0, BB3_2{{$}}
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; CHECK: block BB3_4{{$}}
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; CHECK: br_if $1, BB3_4{{$}}
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; CHECK: br BB3_5{{$}}
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; CHECK: BB3_4:
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; CHECK: BB3_5:
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; CHECK: return ${{[0-9]+}}{{$}}
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; OPT-LABEL: doublediamond:
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; OPT: block BB3_5{{$}}
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; OPT: block BB3_4{{$}}
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; OPT: br_if {{.*}}, BB3_4{{$}}
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; OPT: block BB3_3{{$}}
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; OPT: br_if {{.*}}, BB3_3{{$}}
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; OPT: br BB3_5{{$}}
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; OPT: BB3_4:
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; OPT: BB3_5:
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; OPT: return ${{[0-9]+}}{{$}}
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define i32 @doublediamond(i32 %a, i32 %b, i32* %p) {
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entry:
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%c = icmp eq i32 %a, 0
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%d = icmp eq i32 %b, 0
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store volatile i32 0, i32* %p
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br i1 %c, label %true, label %false
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true:
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store volatile i32 1, i32* %p
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br label %exit
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false:
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store volatile i32 2, i32* %p
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br i1 %d, label %ft, label %ff
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ft:
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store volatile i32 3, i32* %p
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br label %exit
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ff:
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store volatile i32 4, i32* %p
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br label %exit
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exit:
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store volatile i32 5, i32* %p
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ret i32 0
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}
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; CHECK-LABEL: triangle:
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; CHECK: block BB4_2{{$}}
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; CHECK: br_if $1, BB4_2{{$}}
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; CHECK: BB4_2:
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; CHECK: return ${{[0-9]+}}{{$}}
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; OPT-LABEL: triangle:
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; OPT: block BB4_2{{$}}
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; OPT: br_if $1, BB4_2{{$}}
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; OPT: BB4_2:
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; OPT: return ${{[0-9]+}}{{$}}
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define i32 @triangle(i32* %p, i32 %a) {
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entry:
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%c = icmp eq i32 %a, 0
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store volatile i32 0, i32* %p
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br i1 %c, label %true, label %exit
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true:
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store volatile i32 1, i32* %p
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br label %exit
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exit:
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store volatile i32 2, i32* %p
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ret i32 0
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}
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; CHECK-LABEL: diamond:
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; CHECK: block BB5_3{{$}}
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; CHECK: block BB5_2{{$}}
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; CHECK: br_if $1, BB5_2{{$}}
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; CHECK: br BB5_3{{$}}
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; CHECK: BB5_2:
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; CHECK: BB5_3:
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; CHECK: return ${{[0-9]+}}{{$}}
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; OPT-LABEL: diamond:
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; OPT: block BB5_3{{$}}
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; OPT: block BB5_2{{$}}
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; OPT: br_if {{.*}}, BB5_2{{$}}
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; OPT: br BB5_3{{$}}
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; OPT: BB5_2:
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; OPT: BB5_3:
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; OPT: return ${{[0-9]+}}{{$}}
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define i32 @diamond(i32* %p, i32 %a) {
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entry:
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%c = icmp eq i32 %a, 0
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store volatile i32 0, i32* %p
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br i1 %c, label %true, label %false
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true:
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store volatile i32 1, i32* %p
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br label %exit
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false:
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store volatile i32 2, i32* %p
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br label %exit
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exit:
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store volatile i32 3, i32* %p
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ret i32 0
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}
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; CHECK-LABEL: single_block:
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; CHECK-NOT: br
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; CHECK: return $pop{{[0-9]+}}{{$}}
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; OPT-LABEL: single_block:
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; OPT-NOT: br
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; OPT: return $pop{{[0-9]+}}{{$}}
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define i32 @single_block(i32* %p) {
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entry:
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store volatile i32 0, i32* %p
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ret i32 0
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}
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; CHECK-LABEL: minimal_loop:
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; CHECK-NOT: br
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; CHECK: BB7_1:
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; CHECK: i32.store $discard=, 0($0), $pop{{[0-9]+}}{{$}}
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; CHECK: br BB7_1{{$}}
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; CHECK: BB7_2:
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; OPT-LABEL: minimal_loop:
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; OPT-NOT: br
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; OPT: BB7_1:
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; OPT: i32.store $discard=, 0($0), $pop{{[0-9]+}}{{$}}
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; OPT: br BB7_1{{$}}
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; OPT: BB7_2:
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define i32 @minimal_loop(i32* %p) {
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entry:
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store volatile i32 0, i32* %p
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br label %loop
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loop:
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store volatile i32 1, i32* %p
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br label %loop
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}
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; CHECK-LABEL: simple_loop:
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; CHECK-NOT: br
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; CHECK: BB8_1:
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; CHECK: loop BB8_2{{$}}
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; CHECK: br_if $pop{{[0-9]+}}, BB8_1{{$}}
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; CHECK: BB8_2:
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; CHECK: return ${{[0-9]+}}{{$}}
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; OPT-LABEL: simple_loop:
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; OPT-NOT: br
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; OPT: BB8_1:
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; OPT: loop BB8_2{{$}}
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; OPT: br_if {{.*}}, BB8_1{{$}}
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; OPT: BB8_2:
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; OPT: return ${{[0-9]+}}{{$}}
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define i32 @simple_loop(i32* %p, i32 %a) {
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entry:
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%c = icmp eq i32 %a, 0
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store volatile i32 0, i32* %p
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br label %loop
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loop:
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store volatile i32 1, i32* %p
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br i1 %c, label %loop, label %exit
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exit:
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store volatile i32 2, i32* %p
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ret i32 0
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}
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; CHECK-LABEL: doubletriangle:
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; CHECK: block BB9_4{{$}}
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; CHECK: br_if $0, BB9_4{{$}}
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; CHECK: block BB9_3{{$}}
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; CHECK: br_if $1, BB9_3{{$}}
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; CHECK: BB9_3:
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; CHECK: BB9_4:
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; CHECK: return ${{[0-9]+}}{{$}}
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; OPT-LABEL: doubletriangle:
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; OPT: block BB9_4{{$}}
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; OPT: br_if $0, BB9_4{{$}}
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; OPT: block BB9_3{{$}}
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; OPT: br_if $1, BB9_3{{$}}
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; OPT: BB9_3:
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; OPT: BB9_4:
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; OPT: return ${{[0-9]+}}{{$}}
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define i32 @doubletriangle(i32 %a, i32 %b, i32* %p) {
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entry:
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%c = icmp eq i32 %a, 0
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%d = icmp eq i32 %b, 0
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store volatile i32 0, i32* %p
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br i1 %c, label %true, label %exit
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true:
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store volatile i32 2, i32* %p
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br i1 %d, label %tt, label %tf
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tt:
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store volatile i32 3, i32* %p
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br label %tf
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tf:
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store volatile i32 4, i32* %p
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br label %exit
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exit:
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store volatile i32 5, i32* %p
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ret i32 0
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}
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; CHECK-LABEL: ifelse_earlyexits:
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; CHECK: block BB10_4{{$}}
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; CHECK: block BB10_2{{$}}
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; CHECK: br_if $0, BB10_2{{$}}
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; CHECK: br BB10_4{{$}}
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; CHECK: BB10_2:
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; CHECK: br_if $1, BB10_4{{$}}
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; CHECK: BB10_4:
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; CHECK: return ${{[0-9]+}}{{$}}
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; OPT-LABEL: ifelse_earlyexits:
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; OPT: block BB10_4{{$}}
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; OPT: block BB10_3{{$}}
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; OPT: br_if {{.*}}, BB10_3{{$}}
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; OPT: br_if $1, BB10_4{{$}}
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; OPT: br BB10_4{{$}}
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; OPT: BB10_3:
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; OPT: BB10_4:
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; OPT: return ${{[0-9]+}}{{$}}
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define i32 @ifelse_earlyexits(i32 %a, i32 %b, i32* %p) {
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entry:
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%c = icmp eq i32 %a, 0
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%d = icmp eq i32 %b, 0
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store volatile i32 0, i32* %p
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br i1 %c, label %true, label %false
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true:
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store volatile i32 1, i32* %p
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br label %exit
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false:
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store volatile i32 2, i32* %p
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br i1 %d, label %ft, label %exit
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ft:
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store volatile i32 3, i32* %p
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br label %exit
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exit:
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store volatile i32 4, i32* %p
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ret i32 0
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}
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; CHECK-LABEL: doublediamond_in_a_loop:
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; CHECK: BB11_1:
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; CHECK: loop BB11_7{{$}}
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; CHECK: block BB11_6{{$}}
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; CHECK: block BB11_3{{$}}
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; CHECK: br_if $0, BB11_3{{$}}
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; CHECK: br BB11_6{{$}}
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; CHECK: BB11_3:
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; CHECK: block BB11_5{{$}}
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; CHECK: br_if $1, BB11_5{{$}}
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; CHECK: br BB11_6{{$}}
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; CHECK: BB11_5:
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; CHECK: BB11_6:
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; CHECK: br BB11_1{{$}}
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; CHECK: BB11_7:
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; OPT-LABEL: doublediamond_in_a_loop:
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; OPT: BB11_1:
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; OPT: loop BB11_7{{$}}
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; OPT: block BB11_6{{$}}
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; OPT: block BB11_5{{$}}
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; OPT: br_if {{.*}}, BB11_5{{$}}
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; OPT: block BB11_4{{$}}
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; OPT: br_if {{.*}}, BB11_4{{$}}
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; OPT: br BB11_6{{$}}
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; OPT: BB11_4:
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; OPT: br BB11_6{{$}}
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; OPT: BB11_5:
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; OPT: BB11_6:
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; OPT: br BB11_1{{$}}
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; OPT: BB11_7:
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define i32 @doublediamond_in_a_loop(i32 %a, i32 %b, i32* %p) {
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entry:
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br label %header
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header:
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%c = icmp eq i32 %a, 0
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%d = icmp eq i32 %b, 0
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store volatile i32 0, i32* %p
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br i1 %c, label %true, label %false
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true:
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store volatile i32 1, i32* %p
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br label %exit
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false:
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store volatile i32 2, i32* %p
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br i1 %d, label %ft, label %ff
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ft:
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store volatile i32 3, i32* %p
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br label %exit
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ff:
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store volatile i32 4, i32* %p
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br label %exit
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exit:
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store volatile i32 5, i32* %p
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br label %header
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}
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; Test that nested loops are handled.
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declare void @bar()
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define void @test3(i32 %w) {
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entry:
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br i1 undef, label %outer.ph, label %exit
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outer.ph:
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br label %outer
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outer:
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%tobool = icmp eq i32 undef, 0
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br i1 %tobool, label %inner, label %unreachable
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unreachable:
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unreachable
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inner:
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%c = icmp eq i32 undef, %w
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br i1 %c, label %if.end, label %inner
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exit:
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ret void
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if.end:
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call void @bar()
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br label %outer
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}
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