1 ; RUN: opt -globalopt -S < %s | FileCheck %s 2 3 @G1 = internal global i32 5 4 @G2 = internal global i32 5 5 @G3 = internal global i32 5 6 @G4 = internal global i32 5 7 @G5 = internal global i32 5 8 9 ; CHECK-LABEL: @test1 10 define internal i32 @test1() norecurse { 11 ; CHECK-NOT: @G1 12 store i32 4, i32* @G1 13 %a = load i32, i32* @G1 14 ; CHECK: ret 15 ret i32 %a 16 } 17 18 ; The load comes before the store which makes @G2 live before the call. 19 ; CHECK-LABEL: @test2 20 define internal i32 @test2() norecurse { 21 ; CHECK-NOT: %G2 22 %a = load i32, i32* @G2 23 store i32 4, i32* @G2 24 ; CHECK: ret 25 ret i32 %a 26 } 27 28 ; This global is indexed by a GEP - this makes it partial alias and we bail out. 29 ; FIXME: We don't actually have to bail out in this case. 30 31 ; CHECK-LABEL: @test3 32 define internal i32 @test3() norecurse { 33 ; CHECK-NOT: %G3 34 %x = getelementptr i32,i32* @G3, i32 0 35 %a = load i32, i32* %x 36 store i32 4, i32* @G3 37 ; CHECK: ret 38 ret i32 %a 39 } 40 41 ; The global is casted away to a larger type then loaded. The store only partially 42 ; covers the load, so we must not demote. 43 44 ; CHECK-LABEL: @test4 45 define internal i32 @test4() norecurse { 46 ; CHECK-NOT: %G4 47 store i32 4, i32* @G4 48 %x = bitcast i32* @G4 to i64* 49 %a = load i64, i64* %x 50 %b = trunc i64 %a to i32 51 ; CHECK: ret 52 ret i32 %b 53 } 54 55 ; The global is casted away to a smaller type then loaded. This one is fine. 56 57 ; CHECK-LABEL: @test5 58 define internal i32 @test5() norecurse { 59 ; CHECK-NOT: @G5 60 store i32 4, i32* @G5 61 %x = bitcast i32* @G5 to i16* 62 %a = load i16, i16* %x 63 %b = zext i16 %a to i32 64 ; CHECK: ret 65 ret i32 %b 66 } 67 68 define i32 @main() norecurse { 69 %a = call i32 @test1() 70 %b = call i32 @test2() 71 %c = call i32 @test3() 72 %d = call i32 @test4() 73 %e = call i32 @test5() 74 75 %x = or i32 %a, %b 76 %y = or i32 %x, %c 77 %z = or i32 %y, %d 78 %w = or i32 %z, %e 79 ret i32 %w 80 } 81
