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https://github.com/c64scene-ar/llvm-6502.git
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7ac40c3ffa
(indirectbr (select cond, blockaddress(@fn, BlockA),
blockaddress(@fn, BlockB)))
into
(br cond, BlockA, BlockB).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120943 91177308-0d34-0410-b5e6-96231b3b80d8
183 lines
5.0 KiB
LLVM
183 lines
5.0 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: @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: @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: @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: @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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