derek.holloway
7502bf64a4
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120 lines
2.5 KiB
LLVM
120 lines
2.5 KiB
LLVM
; RUN: llc < %s -mtriple=arm-apple-darwin -relocation-model=dynamic-no-pic -mcpu=cortex-a8 -asm-verbose=false | FileCheck %s
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declare void @bar(i32)
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declare void @car(i32)
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declare void @dar(i32)
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declare void @ear(i32)
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declare void @far(i32)
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declare i1 @qux()
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@GHJK = global i32 0
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declare ptr @choose(ptr, ptr)
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; BranchFolding should tail-duplicate the indirect jump to avoid
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; redundant branching.
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; CHECK-LABEL: tail_duplicate_me:
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; CHECK: qux
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; CHECK: movw r{{[0-9]+}}, :lower16:_GHJK
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; CHECK: movt r{{[0-9]+}}, :upper16:_GHJK
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; CHECK: str r
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; CHECK-NEXT: bx r
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; CHECK: qux
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; CHECK: movw r{{[0-9]+}}, :lower16:_GHJK
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; CHECK: movt r{{[0-9]+}}, :upper16:_GHJK
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; CHECK: str r
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; CHECK-NEXT: bx r
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; CHECK: movw r{{[0-9]+}}, :lower16:_GHJK
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; CHECK: movt r{{[0-9]+}}, :upper16:_GHJK
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; CHECK: str r
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; CHECK-NEXT: bx r
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define void @tail_duplicate_me() nounwind {
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entry:
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%a = call i1 @qux()
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%c = call ptr @choose(ptr blockaddress(@tail_duplicate_me, %return),
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ptr blockaddress(@tail_duplicate_me, %altret))
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br i1 %a, label %A, label %next
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next:
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%b = call i1 @qux()
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br i1 %b, label %B, label %C
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A:
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call void @bar(i32 0)
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store i32 0, ptr @GHJK
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br label %M
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B:
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call void @car(i32 1)
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store i32 0, ptr @GHJK
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br label %M
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C:
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call void @dar(i32 2)
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store i32 0, ptr @GHJK
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br label %M
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M:
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indirectbr ptr %c, [label %return, label %altret]
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return:
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call void @ear(i32 1000)
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ret void
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altret:
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call void @far(i32 1001)
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ret void
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}
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; Use alternating abort functions so that the blocks we wish to merge are not
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; layout successors during branch folding.
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; CHECK-LABEL: merge_alternating_aborts:
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; CHECK-NOT: _abort
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; CHECK-NOT: _alt_abort
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; CHECK: bxne lr
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; CHECK-NOT: _abort
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; CHECK-NOT: _alt_abort
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; CHECK: LBB{{.*}}:
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; CHECK: mov lr, pc
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; CHECK: b _alt_abort
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; CHECK-NOT: _abort
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; CHECK-NOT: _alt_abort
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; CHECK: LBB{{.*}}:
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; CHECK: mov lr, pc
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; CHECK: b _abort
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; CHECK-NOT: _abort
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; CHECK-NOT: _alt_abort
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declare void @abort()
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declare void @alt_abort()
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define void @merge_alternating_aborts() {
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entry:
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%c1 = call i1 @qux()
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br i1 %c1, label %cont1, label %abort1
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abort1:
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call void @abort()
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unreachable
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cont1:
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%c2 = call i1 @qux()
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br i1 %c2, label %cont2, label %abort2
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abort2:
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call void @alt_abort()
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unreachable
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cont2:
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%c3 = call i1 @qux()
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br i1 %c3, label %cont3, label %abort3
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abort3:
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call void @abort()
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unreachable
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cont3:
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%c4 = call i1 @qux()
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br i1 %c4, label %cont4, label %abort4
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abort4:
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call void @alt_abort()
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unreachable
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cont4:
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ret void
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}
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