| ; RUN: opt < %s -simplifycfg -S | FileCheck %s |
| ; |
| ; rdar:13349374 |
| ; |
| ; SimplifyCFG should not eliminate blocks with volatile stores. |
| ; Essentially, volatile needs to be backdoor that tells the optimizer |
| ; it can no longer use language standard as an excuse. The compiler |
| ; needs to expose the volatile access to the platform. |
| ; |
| ; CHECK-LABEL: @test( |
| ; CHECK: entry: |
| ; CHECK: @Trace |
| ; CHECK: while.body: |
| ; CHECK: store volatile |
| ; CHECK: end: |
| 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" |
| |
| define void @test(i8** nocapture %PeiServices) #0 { |
| entry: |
| %call = tail call i32 (...) @Trace() #2 |
| %tobool = icmp eq i32 %call, 0 |
| br i1 %tobool, label %while.body, label %if.then |
| |
| if.then: ; preds = %entry |
| %call1 = tail call i32 (...) @Trace() #2 |
| br label %while.body |
| |
| while.body: ; preds = %entry, %if.then, %while.body |
| %Addr.017 = phi i8* [ %incdec.ptr, %while.body ], [ null, %if.then ], [ null, %entry ] |
| %x.016 = phi i8 [ %inc, %while.body ], [ 0, %if.then ], [ 0, %entry ] |
| %inc = add i8 %x.016, 1 |
| %incdec.ptr = getelementptr inbounds i8, i8* %Addr.017, i64 1 |
| store volatile i8 %x.016, i8* %Addr.017, align 1 |
| %0 = ptrtoint i8* %incdec.ptr to i64 |
| %1 = trunc i64 %0 to i32 |
| %cmp = icmp ult i32 %1, 4096 |
| br i1 %cmp, label %while.body, label %end |
| |
| end: |
| ret void |
| } |
| declare i32 @Trace(...) #1 |
| |
| attributes #0 = { nounwind ssp uwtable "fp-contract-model"="standard" "no-frame-pointer-elim" "no-frame-pointer-elim-non-leaf" "relocation-model"="pic" "ssp-buffers-size"="8" } |
| attributes #1 = { "fp-contract-model"="standard" "no-frame-pointer-elim" "no-frame-pointer-elim-non-leaf" "relocation-model"="pic" "ssp-buffers-size"="8" } |
| attributes #2 = { nounwind } |
| |
| !0 = !{i32 1039} |