aa2009fe78
First step after e113317958,
in these tests, DomTree is valid afterwards, so mark them as such,
so that they don't regress.
In further steps, SimplifyCFG transforms shall taught to preserve DomTree,
in as small steps as possible.
49 lines
1.8 KiB
LLVM
49 lines
1.8 KiB
LLVM
; RUN: opt < %s -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
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;
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; rdar:13349374
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;
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; SimplifyCFG should not eliminate blocks with volatile stores.
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; Essentially, volatile needs to be backdoor that tells the optimizer
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; it can no longer use language standard as an excuse. The compiler
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; needs to expose the volatile access to the platform.
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;
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; CHECK-LABEL: @test(
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; CHECK: entry:
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; CHECK: @Trace
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; CHECK: while.body:
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; CHECK: store volatile
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; CHECK: end:
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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define void @test(i8** nocapture %PeiServices) #0 {
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entry:
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%call = tail call i32 (...) @Trace() #2
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%tobool = icmp eq i32 %call, 0
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br i1 %tobool, label %while.body, label %if.then
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if.then: ; preds = %entry
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%call1 = tail call i32 (...) @Trace() #2
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br label %while.body
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while.body: ; preds = %entry, %if.then, %while.body
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%Addr.017 = phi i8* [ %incdec.ptr, %while.body ], [ null, %if.then ], [ null, %entry ]
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%x.016 = phi i8 [ %inc, %while.body ], [ 0, %if.then ], [ 0, %entry ]
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%inc = add i8 %x.016, 1
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%incdec.ptr = getelementptr inbounds i8, i8* %Addr.017, i64 1
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store volatile i8 %x.016, i8* %Addr.017, align 1
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%0 = ptrtoint i8* %incdec.ptr to i64
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%1 = trunc i64 %0 to i32
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%cmp = icmp ult i32 %1, 4096
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br i1 %cmp, label %while.body, label %end
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end:
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ret void
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}
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declare i32 @Trace(...) #1
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attributes #0 = { nounwind ssp uwtable "fp-contract-model"="standard" "frame-pointer"="non-leaf" "relocation-model"="pic" "ssp-buffers-size"="8" }
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attributes #1 = { "fp-contract-model"="standard" "frame-pointer"="non-leaf" "relocation-model"="pic" "ssp-buffers-size"="8" }
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attributes #2 = { nounwind }
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!0 = !{i32 1039}
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