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PR11705, part 2: globalopt shouldn't put inttoptr/ptrtoint operations into global initializers if there's an implied extension or truncation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147625 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2012-01-05 23:03:32 +00:00
parent 3ed8815541
commit fb54ad19e7
2 changed files with 35 additions and 14 deletions
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19
test/Transforms/GlobalOpt/ctor-list-opt-constexpr.ll
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@@ -4,20 +4,31 @@ target triple = "x86_64-apple-darwin10.0.0"
%0 = type { i32, void ()* }
%struct.foo = type { i32* }
%struct.bar = type { i128 }
@G = global i32 0, align 4
@H = global i32 0, align 4
@X = global %struct.foo zeroinitializer, align 8
@llvm.global_ctors = appending global [1 x %0] [%0 { i32 65535, void ()* @init }]
@X2 = global %struct.bar zeroinitializer, align 8
@llvm.global_ctors = appending global [2 x %0] [%0 { i32 65535, void ()* @init1 }, %0 { i32 65535, void ()* @init2 }]
; PR8710 - GlobalOpt shouldn't change the global's initializer to have this
; arbitrary constant expression, the code generator can't handle it.
define internal void @init() {
define internal void @init1() {
entry:
%tmp = getelementptr inbounds %struct.foo* @X, i32 0, i32 0
store i32* inttoptr (i64 sdiv (i64 ptrtoint (i32* @G to i64), i64 ptrtoint (i32* @H to i64)) to i32*), i32** %tmp, align 8
ret void
}
; CHECK: @init
; CHECK: @init1
; CHECK: store i32*
; PR11705 - ptrtoint isn't safe in general in global initializers.
define internal void @init2() {
entry:
%tmp = getelementptr inbounds %struct.bar* @X2, i32 0, i32 0
store i128 ptrtoint (i32* @G to i128), i128* %tmp, align 16
ret void
}
; CHECK: @init2
; CHECK: store i128