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llvm-project/llvm/test/Transforms/GlobalOpt/memset-null.ll

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Obey the isVolatile bit on memory intrinsics when analyzing uses of a global variable. Noticed by inspection. Simulate memset in EvaluateFunction where the target of the memset and the value we're setting are both the null value. Fixes PR10047! llvm-svn: 132288
2011-05-30 02:41:56 +08:00
; RUN: opt -globalopt %s -S -o - | FileCheck %s
; PR10047
%0 = type { i32, void ()* }
%struct.A = type { [100 x i32] }
; CHECK: @a
@a = global %struct.A zeroinitializer, align 4
Add testcase for r132290, to check for the crasher caught by the buildbots doing llvm-gcc selfhost (or cross). llvm-svn: 132292
2011-05-30 03:41:14 +08:00
@llvm.global_ctors = appending global [2 x %0] [%0 { i32 65535, void ()* @_GLOBAL__I_a }, %0 { i32 65535, void ()* @_GLOBAL__I_b }]
Obey the isVolatile bit on memory intrinsics when analyzing uses of a global variable. Noticed by inspection. Simulate memset in EvaluateFunction where the target of the memset and the value we're setting are both the null value. Fixes PR10047! llvm-svn: 132288
2011-05-30 02:41:56 +08:00
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
; CHECK-NOT: GLOBAL__I_a
define internal void @_GLOBAL__I_a() nounwind {
entry:
tail call void @llvm.memset.p0i8.i64(i8* bitcast (%struct.A* @a to i8*), i8 0, i64 400, i32 4, i1 false) nounwind
ret void
}
Add testcase for r132290, to check for the crasher caught by the buildbots doing llvm-gcc selfhost (or cross). llvm-svn: 132292
2011-05-30 03:41:14 +08:00
%struct.X = type { i8 }
@y = global i8* null, align 8
@x = global %struct.X zeroinitializer, align 1
define internal void @_GLOBAL__I_b() nounwind {
entry:
%tmp.i.i.i = load i8** @y, align 8
tail call void @llvm.memset.p0i8.i64(i8* %tmp.i.i.i, i8 0, i64 10, i32 1, i1 false) nounwind
ret void
}