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a980977c67
This state is no longer useful and not guaranteed to be valid in later codegen passes. For example, see the added test, which would print a savepoint of %bb.-1 without this change, and crashes with a use-after-free error under ASan if you apply the recycling allocator patch from llvm.org/PR26808. llvm-svn: 266150
28 lines
664 B
LLVM
28 lines
664 B
LLVM
; RUN: llc -mtriple thumbv7 -stop-after=if-converter < %s 2>&1 | FileCheck %s
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; Make sure the save point and restore point are dropped from MFI at
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; this point. Notably, if it isn't is will be invalid and reference a
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; deleted block (%bb.-1.if.end)
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; CHECK-NOT: savePoint:
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; CHECK-NOT: restorePoint:
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7"
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define i32 @f(i32 %n) {
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entry:
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%cmp = icmp ult i32 %n, 4
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br i1 %cmp, label %return, label %if.end
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if.end:
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tail call void @g(i32 %n)
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br label %return
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return:
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%retval.0 = phi i32 [ 0, %if.end ], [ -1, %entry ]
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ret i32 %retval.0
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}
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declare void @g(i32)
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