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1a2b069bb9
GlobalOpt runs early in the pipeline (before inlining) and complex class hierarchies often introduce bitcasts or GEPs which weren't optimized away. Teach it to ignore side-effect free instructions instead of depending on other passes to remove them. llvm-svn: 150174
34 lines
1.1 KiB
LLVM
34 lines
1.1 KiB
LLVM
; RUN: opt < %s -globalopt -S | FileCheck %s
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%0 = type { i32, void ()* }
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%struct.A = type { i8 }
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%struct.B = type { }
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@a = global %struct.A zeroinitializer, align 1
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@__dso_handle = external global i8*
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@llvm.global_ctors = appending global [1 x %0] [%0 { i32 65535, void ()* @_GLOBAL__I_a }]
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; CHECK-NOT: call i32 @__cxa_atexit
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define internal void @__cxx_global_var_init() nounwind section "__TEXT,__StaticInit,regular,pure_instructions" {
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%1 = call i32 @__cxa_atexit(void (i8*)* bitcast (void (%struct.A*)* @_ZN1AD1Ev to void (i8*)*), i8* getelementptr inbounds (%struct.A* @a, i32 0, i32 0), i8* bitcast (i8** @__dso_handle to i8*))
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ret void
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}
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define linkonce_odr void @_ZN1AD1Ev(%struct.A* %this) nounwind align 2 {
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%t = bitcast %struct.A* %this to %struct.B*
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call void @_ZN1BD1Ev(%struct.B* %t)
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ret void
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}
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declare i32 @__cxa_atexit(void (i8*)*, i8*, i8*)
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define linkonce_odr void @_ZN1BD1Ev(%struct.B* %this) nounwind align 2 {
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ret void
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}
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define internal void @_GLOBAL__I_a() nounwind section "__TEXT,__StaticInit,regular,pure_instructions" {
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call void @__cxx_global_var_init()
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ret void
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}
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