1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -passes=globalopt -S < %s | FileCheck %s 3 4@G1 = internal global i32 5 5@G2 = internal global i32 5 6@G3 = internal global i32 5 7@G4 = internal global i32 5 8@G5 = internal global i32 5 9 10define i32 @test1() norecurse { 11; CHECK-LABEL: @test1( 12; CHECK-NEXT: [[G1:%.*]] = alloca i32, align 4 13; CHECK-NEXT: store i32 5, ptr [[G1]], align 4 14; CHECK-NEXT: store i32 4, ptr [[G1]], align 4 15; CHECK-NEXT: [[A:%.*]] = load i32, ptr [[G1]], align 4 16; CHECK-NEXT: ret i32 [[A]] 17; 18 store i32 4, ptr @G1 19 %a = load i32, ptr @G1 20 ret i32 %a 21} 22 23; The load comes before the store which makes @G2 live before the call. 24define i32 @test2() norecurse { 25; CHECK-LABEL: @test2( 26; CHECK-NEXT: [[A_B:%.*]] = load i1, ptr @G2, align 1 27; CHECK-NEXT: [[A:%.*]] = select i1 [[A_B]], i32 4, i32 5 28; CHECK-NEXT: store i1 true, ptr @G2, align 1 29; CHECK-NEXT: ret i32 [[A]] 30; 31 %a = load i32, ptr @G2 32 store i32 4, ptr @G2 33 ret i32 %a 34} 35 36; This global is indexed by a GEP - this makes it partial alias and we bail out. 37; FIXME: We don't actually have to bail out in this case. 38define i32 @test3() norecurse { 39; CHECK-LABEL: @test3( 40; CHECK-NEXT: [[A_B:%.*]] = load i1, ptr @G3, align 1 41; CHECK-NEXT: [[A:%.*]] = select i1 [[A_B]], i32 4, i32 5 42; CHECK-NEXT: store i1 true, ptr @G3, align 1 43; CHECK-NEXT: ret i32 [[A]] 44; 45 %a = load i32, ptr @G3 46 store i32 4, ptr @G3 47 ret i32 %a 48} 49 50; The global is casted away to a larger type then loaded. The store only partially 51; covers the load, so we must not demote. 52define i32 @test4() norecurse { 53; CHECK-LABEL: @test4( 54; CHECK-NEXT: store i32 4, ptr @G4, align 4 55; CHECK-NEXT: [[A:%.*]] = load i64, ptr @G4, align 4 56; CHECK-NEXT: [[B:%.*]] = trunc i64 [[A]] to i32 57; CHECK-NEXT: ret i32 [[B]] 58; 59 store i32 4, ptr @G4 60 %a = load i64, ptr @G4 61 %b = trunc i64 %a to i32 62 ret i32 %b 63} 64 65; The global is casted away to a smaller type then loaded. This one is fine. 66define i32 @test5() norecurse { 67; CHECK-LABEL: @test5( 68; CHECK-NEXT: [[G5:%.*]] = alloca i32, align 4 69; CHECK-NEXT: store i32 5, ptr [[G5]], align 4 70; CHECK-NEXT: store i32 4, ptr [[G5]], align 4 71; CHECK-NEXT: [[A:%.*]] = load i16, ptr [[G5]], align 2 72; CHECK-NEXT: [[B:%.*]] = zext i16 [[A]] to i32 73; CHECK-NEXT: ret i32 [[B]] 74; 75 store i32 4, ptr @G5 76 %a = load i16, ptr @G5 77 %b = zext i16 %a to i32 78 ret i32 %b 79} 80