1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s 3; 4; rdar:13349374 5; 6; SimplifyCFG should not eliminate blocks with volatile stores. 7; Essentially, volatile needs to be backdoor that tells the optimizer 8; it can no longer use language standard as an excuse. The compiler 9; needs to expose the volatile access to the platform. 10 11target 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" 12 13define void @test(ptr nocapture %PeiServices) #0 { 14; CHECK-LABEL: @test( 15; CHECK-NEXT: entry: 16; CHECK-NEXT: [[CALL:%.*]] = tail call i32 (...) @Trace() #[[ATTR2:[0-9]+]] 17; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[CALL]], 0 18; CHECK-NEXT: br i1 [[TOBOOL]], label [[WHILE_BODY:%.*]], label [[IF_THEN:%.*]] 19; CHECK: if.then: 20; CHECK-NEXT: [[CALL1:%.*]] = tail call i32 (...) @Trace() #[[ATTR2]] 21; CHECK-NEXT: br label [[WHILE_BODY]] 22; CHECK: while.body: 23; CHECK-NEXT: [[ADDR_017:%.*]] = phi ptr [ [[INCDEC_PTR:%.*]], [[WHILE_BODY]] ], [ null, [[IF_THEN]] ], [ null, [[ENTRY:%.*]] ] 24; CHECK-NEXT: [[X_016:%.*]] = phi i8 [ [[INC:%.*]], [[WHILE_BODY]] ], [ 0, [[IF_THEN]] ], [ 0, [[ENTRY]] ] 25; CHECK-NEXT: [[INC]] = add i8 [[X_016]], 1 26; CHECK-NEXT: [[INCDEC_PTR]] = getelementptr inbounds i8, ptr [[ADDR_017]], i64 1 27; CHECK-NEXT: store volatile i8 [[X_016]], ptr [[ADDR_017]], align 1 28; CHECK-NEXT: [[TMP0:%.*]] = ptrtoint ptr [[INCDEC_PTR]] to i64 29; CHECK-NEXT: [[TMP1:%.*]] = trunc i64 [[TMP0]] to i32 30; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[TMP1]], 4096 31; CHECK-NEXT: br i1 [[CMP]], label [[WHILE_BODY]], label [[END:%.*]] 32; CHECK: end: 33; CHECK-NEXT: ret void 34; 35entry: 36 %call = tail call i32 (...) @Trace() #2 37 %tobool = icmp eq i32 %call, 0 38 br i1 %tobool, label %while.body, label %if.then 39 40if.then: ; preds = %entry 41 %call1 = tail call i32 (...) @Trace() #2 42 br label %while.body 43 44while.body: ; preds = %entry, %if.then, %while.body 45 %Addr.017 = phi ptr [ %incdec.ptr, %while.body ], [ null, %if.then ], [ null, %entry ] 46 %x.016 = phi i8 [ %inc, %while.body ], [ 0, %if.then ], [ 0, %entry ] 47 %inc = add i8 %x.016, 1 48 %incdec.ptr = getelementptr inbounds i8, ptr %Addr.017, i64 1 49 store volatile i8 %x.016, ptr %Addr.017, align 1 50 %0 = ptrtoint ptr %incdec.ptr to i64 51 %1 = trunc i64 %0 to i32 52 %cmp = icmp ult i32 %1, 4096 53 br i1 %cmp, label %while.body, label %end 54 55end: 56 ret void 57} 58declare i32 @Trace(...) #1 59 60attributes #0 = { nounwind ssp uwtable "fp-contract-model"="standard" "frame-pointer"="non-leaf" "relocation-model"="pic" "ssp-buffers-size"="8" } 61attributes #1 = { "fp-contract-model"="standard" "frame-pointer"="non-leaf" "relocation-model"="pic" "ssp-buffers-size"="8" } 62attributes #2 = { nounwind } 63 64!0 = !{i32 1039} 65