81 lines
1.8 KiB
LLVM
81 lines
1.8 KiB
LLVM
|
; RUN: opt -globalopt -S < %s | FileCheck %s
|
||
|
|
|
||
|
|
@G1 = internal global i32 5
|
||
|
|
@G2 = internal global i32 5
|
||
|
|
@G3 = internal global i32 5
|
||
|
|
@G4 = internal global i32 5
|
||
|
|
@G5 = internal global i32 5
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test1
|
||
|
|
define internal i32 @test1() norecurse {
|
||
|
|
; CHECK-NOT: @G1
|
||
|
|
store i32 4, i32* @G1
|
||
|
|
%a = load i32, i32* @G1
|
||
|
|
; CHECK: ret
|
||
|
|
ret i32 %a
|
||
|
|
}
|
||
|
|
|
||
|
|
; The load comes before the store which makes @G2 live before the call.
|
||
|
|
; CHECK-LABEL: @test2
|
||
|
|
define internal i32 @test2() norecurse {
|
||
|
|
; CHECK-NOT: %G2
|
||
|
|
%a = load i32, i32* @G2
|
||
|
|
store i32 4, i32* @G2
|
||
|
|
; CHECK: ret
|
||
|
|
ret i32 %a
|
||
|
|
}
|
||
|
|
|
||
|
|
; This global is indexed by a GEP - this makes it partial alias and we bail out.
|
||
|
|
; FIXME: We don't actually have to bail out in this case.
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test3
|
||
|
|
define internal i32 @test3() norecurse {
|
||
|
|
; CHECK-NOT: %G3
|
||
|
|
%x = getelementptr i32,i32* @G3, i32 0
|
||
|
|
%a = load i32, i32* %x
|
||
|
|
store i32 4, i32* @G3
|
||
|
|
; CHECK: ret
|
||
|
|
ret i32 %a
|
||
|
|
}
|
||
|
|
|
||
|
|
; The global is casted away to a larger type then loaded. The store only partially
|
||
|
|
; covers the load, so we must not demote.
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test4
|
||
|
|
define internal i32 @test4() norecurse {
|
||
|
|
; CHECK-NOT: %G4
|
||
|
|
store i32 4, i32* @G4
|
||
|
|
%x = bitcast i32* @G4 to i64*
|
||
|
|
%a = load i64, i64* %x
|
||
|
|
%b = trunc i64 %a to i32
|
||
|
|
; CHECK: ret
|
||
|
|
ret i32 %b
|
||
|
|
}
|
||
|
|
|
||
|
|
; The global is casted away to a smaller type then loaded. This one is fine.
|
||
|
|
|
||
|
|
; CHECK-LABEL: @test5
|
||
|
|
define internal i32 @test5() norecurse {
|
||
|
|
; CHECK-NOT: @G5
|
||
|
|
store i32 4, i32* @G5
|
||
|
|
%x = bitcast i32* @G5 to i16*
|
||
|
|
%a = load i16, i16* %x
|
||
|
|
%b = zext i16 %a to i32
|
||
|
|
; CHECK: ret
|
||
|
|
ret i32 %b
|
||
|
|
}
|
||
|
|
|
||
|
|
define i32 @main() norecurse {
|
||
|
|
%a = call i32 @test1()
|
||
|
|
%b = call i32 @test2()
|
||
|
|
%c = call i32 @test3()
|
||
|
|
%d = call i32 @test4()
|
||
|
|
%e = call i32 @test5()
|
||
|
|
|
||
|
|
%x = or i32 %a, %b
|
||
|
|
%y = or i32 %x, %c
|
||
|
|
%z = or i32 %y, %d
|
||
|
|
%w = or i32 %z, %e
|
||
|
|
ret i32 %w
|
||
|
|
}
|