forked from OSchip/llvm-project
252 lines
7.1 KiB
LLVM
252 lines
7.1 KiB
LLVM
; RUN: opt -S -simplifycfg < %s | FileCheck %s
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; SimplifyCFG should eliminate redundant indirectbr edges.
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; CHECK: indbrtest0
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; CHECK: indirectbr i8* %t, [label %BB0, label %BB1, label %BB2]
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; CHECK: %x = phi i32 [ 0, %BB0 ], [ 1, %entry ]
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declare void @foo()
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declare void @A()
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declare void @B(i32)
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declare void @C()
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define void @indbrtest0(i8** %P, i8** %Q) {
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entry:
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store i8* blockaddress(@indbrtest0, %BB0), i8** %P
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store i8* blockaddress(@indbrtest0, %BB1), i8** %P
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store i8* blockaddress(@indbrtest0, %BB2), i8** %P
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call void @foo()
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%t = load i8** %Q
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indirectbr i8* %t, [label %BB0, label %BB1, label %BB2, label %BB0, label %BB1, label %BB2]
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BB0:
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call void @A()
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br label %BB1
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BB1:
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%x = phi i32 [ 0, %BB0 ], [ 1, %entry ], [ 1, %entry ]
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call void @B(i32 %x)
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ret void
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BB2:
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call void @C()
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ret void
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}
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; SimplifyCFG should convert the indirectbr into a directbr. It would be even
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; better if it removed the branch altogether, but simplifycfdg currently misses
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; that because the predecessor is the entry block.
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; CHECK: indbrtest1
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; CHECK: br label %BB0
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define void @indbrtest1(i8** %P, i8** %Q) {
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entry:
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store i8* blockaddress(@indbrtest1, %BB0), i8** %P
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call void @foo()
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%t = load i8** %Q
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indirectbr i8* %t, [label %BB0, label %BB0]
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BB0:
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call void @A()
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ret void
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}
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; SimplifyCFG should notice that BB0 does not have its address taken and
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; remove it from entry's successor list.
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; CHECK: indbrtest2
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; CHECK: entry:
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; CHECK-NEXT: unreachable
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define void @indbrtest2(i8* %t) {
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entry:
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indirectbr i8* %t, [label %BB0, label %BB0]
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BB0:
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ret void
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}
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; Make sure the blocks in the next few tests aren't trivially removable as
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; successors by taking their addresses.
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@anchor = constant [13 x i8*] [
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i8* blockaddress(@indbrtest3, %L1), i8* blockaddress(@indbrtest3, %L2), i8* blockaddress(@indbrtest3, %L3),
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i8* blockaddress(@indbrtest4, %L1), i8* blockaddress(@indbrtest4, %L2), i8* blockaddress(@indbrtest4, %L3),
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i8* blockaddress(@indbrtest5, %L1), i8* blockaddress(@indbrtest5, %L2), i8* blockaddress(@indbrtest5, %L3), i8* blockaddress(@indbrtest5, %L4),
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i8* blockaddress(@indbrtest6, %L1), i8* blockaddress(@indbrtest6, %L2), i8* blockaddress(@indbrtest6, %L3)
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]
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; SimplifyCFG should turn the indirectbr into a conditional branch on the
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; condition of the select.
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; CHECK-LABEL: @indbrtest3(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 %cond, label %L1, label %L2
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; CHECK-NOT: indirectbr
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; CHECK-NOT: br
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; CHECK-NOT: L3:
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define void @indbrtest3(i1 %cond, i8* %address) nounwind {
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entry:
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%indirect.goto.dest = select i1 %cond, i8* blockaddress(@indbrtest3, %L1), i8* blockaddress(@indbrtest3, %L2)
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indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]
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L1:
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call void @A()
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ret void
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L2:
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call void @C()
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ret void
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L3:
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call void @foo()
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ret void
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}
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; SimplifyCFG should turn the indirectbr into an unconditional branch to the
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; only possible destination.
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; As in @indbrtest1, it should really remove the branch entirely, but it doesn't
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; because it's in the entry block.
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; CHECK-LABEL: @indbrtest4(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label %L1
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define void @indbrtest4(i1 %cond) nounwind {
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entry:
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%indirect.goto.dest = select i1 %cond, i8* blockaddress(@indbrtest4, %L1), i8* blockaddress(@indbrtest4, %L1)
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indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]
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L1:
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call void @A()
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ret void
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L2:
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call void @C()
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ret void
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L3:
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call void @foo()
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ret void
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}
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; SimplifyCFG should turn the indirectbr into an unreachable because neither
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; destination is listed as a successor.
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; CHECK-LABEL: @indbrtest5(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: unreachable
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; CHECK-NEXT: }
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define void @indbrtest5(i1 %cond, i8* %anchor) nounwind {
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entry:
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%indirect.goto.dest = select i1 %cond, i8* blockaddress(@indbrtest5, %L1), i8* blockaddress(@indbrtest5, %L2)
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; This needs to have more than one successor for this test, otherwise it gets
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; replaced with an unconditional branch to the single successor.
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indirectbr i8* %indirect.goto.dest, [label %L3, label %L4]
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L1:
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call void @A()
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ret void
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L2:
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call void @C()
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ret void
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L3:
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call void @foo()
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ret void
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L4:
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call void @foo()
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; This keeps blockaddresses not otherwise listed as successors from being zapped
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; before SimplifyCFG even looks at the indirectbr.
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indirectbr i8* %anchor, [label %L1, label %L2]
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}
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; The same as above, except the selected addresses are equal.
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; CHECK-LABEL: @indbrtest6(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: unreachable
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; CHECK-NEXT: }
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define void @indbrtest6(i1 %cond, i8* %anchor) nounwind {
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entry:
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%indirect.goto.dest = select i1 %cond, i8* blockaddress(@indbrtest6, %L1), i8* blockaddress(@indbrtest6, %L1)
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; This needs to have more than one successor for this test, otherwise it gets
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; replaced with an unconditional branch to the single successor.
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indirectbr i8* %indirect.goto.dest, [label %L2, label %L3]
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L1:
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call void @A()
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ret void
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L2:
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call void @C()
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ret void
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L3:
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call void @foo()
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; This keeps blockaddresses not otherwise listed as successors from being zapped
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; before SimplifyCFG even looks at the indirectbr.
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indirectbr i8* %anchor, [label %L1, label %L2]
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}
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; PR10072
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@xblkx.bbs = internal unnamed_addr constant [9 x i8*] [i8* blockaddress(@indbrtest7, %xblkx.begin), i8* blockaddress(@indbrtest7, %xblkx.begin3), i8* blockaddress(@indbrtest7, %xblkx.begin4), i8* blockaddress(@indbrtest7, %xblkx.begin5), i8* blockaddress(@indbrtest7, %xblkx.begin6), i8* blockaddress(@indbrtest7, %xblkx.begin7), i8* blockaddress(@indbrtest7, %xblkx.begin8), i8* blockaddress(@indbrtest7, %xblkx.begin9), i8* blockaddress(@indbrtest7, %xblkx.end)]
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define void @indbrtest7() {
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escape-string.top:
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%xval202x = call i32 @xfunc5x()
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br label %xlab5x
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xlab8x: ; preds = %xlab5x
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%xvaluex = call i32 @xselectorx()
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%xblkx.x = getelementptr [9 x i8*]* @xblkx.bbs, i32 0, i32 %xvaluex
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%xblkx.load = load i8** %xblkx.x
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indirectbr i8* %xblkx.load, [label %xblkx.begin, label %xblkx.begin3, label %xblkx.begin4, label %xblkx.begin5, label %xblkx.begin6, label %xblkx.begin7, label %xblkx.begin8, label %xblkx.begin9, label %xblkx.end]
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xblkx.begin:
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br label %xblkx.end
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xblkx.begin3:
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br label %xblkx.end
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xblkx.begin4:
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br label %xblkx.end
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xblkx.begin5:
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br label %xblkx.end
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xblkx.begin6:
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br label %xblkx.end
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xblkx.begin7:
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br label %xblkx.end
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xblkx.begin8:
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br label %xblkx.end
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xblkx.begin9:
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br label %xblkx.end
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xblkx.end:
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%yes.0 = phi i1 [ false, %xblkx.begin ], [ true, %xlab8x ], [ false, %xblkx.begin9 ], [ false, %xblkx.begin8 ], [ false, %xblkx.begin7 ], [ false, %xblkx.begin6 ], [ false, %xblkx.begin5 ], [ true, %xblkx.begin4 ], [ false, %xblkx.begin3 ]
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br i1 %yes.0, label %v2j, label %xlab17x
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v2j:
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; CHECK: %xunusedx = call i32 @xactionx()
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%xunusedx = call i32 @xactionx()
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br label %xlab4x
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xlab17x:
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br label %xlab4x
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xlab4x:
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%incr19 = add i32 %xval704x.0, 1
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br label %xlab5x
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xlab5x:
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%xval704x.0 = phi i32 [ 0, %escape-string.top ], [ %incr19, %xlab4x ]
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%xval10x = icmp ult i32 %xval704x.0, %xval202x
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br i1 %xval10x, label %xlab8x, label %xlab9x
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xlab9x:
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ret void
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}
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declare i32 @xfunc5x()
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declare i8 @xfunc7x()
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declare i32 @xselectorx()
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declare i32 @xactionx()
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