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; RUN: opt -S -rewrite-statepoints-for-gc %s | FileCheck %s
declare void @foo()
declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)
; constants don't get relocated.
define i8 @test() gc "statepoint-example" {
; CHECK-LABEL: @test
; CHECK: gc.statepoint
; CHECK-NEXT: load i8, i8 addrspace(1)* inttoptr (i64 15 to i8 addrspace(1)*)
entry:
call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0)
%res = load i8, i8 addrspace(1)* inttoptr (i64 15 to i8 addrspace(1)*)
ret i8 %res
}
; Mostly just here to show reasonable code test can come from.
define i8 @test2(i8 addrspace(1)* %p) gc "statepoint-example" {
; CHECK-LABEL: @test2
; CHECK: gc.statepoint
; CHECK-NEXT: gc.relocate
; CHECK-NEXT: icmp
entry:
call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0)
%cmp = icmp eq i8 addrspace(1)* %p, null
br i1 %cmp, label %taken, label %not_taken
taken:
ret i8 0
not_taken:
%cmp2 = icmp ne i8 addrspace(1)* %p, null
br i1 %cmp2, label %taken, label %dead
dead:
; We see that dead can't be reached, but the optimizer might not. It's
; completely legal for it to exploit the fact that if dead executed, %p
; would have to equal null. This can produce intermediate states which
; look like that of test above, even if arbitrary constant addresses aren't
; legal in the source language
%addr = getelementptr i8, i8 addrspace(1)* %p, i32 15
%res = load i8, i8addrspace(1)* %addr
ret i8 %res
}
@G = addrspace(1) global i8 5
; Globals don't move and thus don't get relocated
define i8 @test3(i1 %always_true) gc "statepoint-example" {
; CHECK-LABEL: @test3
; CHECK: gc.statepoint
; CHECK-NEXT: load i8, i8 addrspace(1)* @G
entry:
call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @foo, i32 0, i32 0, i32 0, i32 0)
%res = load i8, i8 addrspace(1)* @G, align 1
ret i8 %res
}
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