1; RUN: opt -scoped-noalias -basicaa -gvn -S < %s | FileCheck %s 2 3define i32 @test1(i32* %p, i32* %q) { 4; CHECK-LABEL: @test1(i32* %p, i32* %q) 5; CHECK: load i32, i32* %p 6; CHECK-NOT: noalias 7; CHECK: %c = add i32 %a, %a 8 %a = load i32, i32* %p, !noalias !0 9 %b = load i32, i32* %p 10 %c = add i32 %a, %b 11 ret i32 %c 12} 13 14define i32 @test2(i32* %p, i32* %q) { 15; CHECK-LABEL: @test2(i32* %p, i32* %q) 16; CHECK: load i32, i32* %p, !alias.scope !0 17; CHECK: %c = add i32 %a, %a 18 %a = load i32, i32* %p, !alias.scope !0 19 %b = load i32, i32* %p, !alias.scope !0 20 %c = add i32 %a, %b 21 ret i32 %c 22} 23 24; FIXME: In this case we can do better than intersecting the scopes, and can 25; concatenate them instead. Both loads are in the same basic block, the first 26; makes the second safe to speculatively execute, and there are no calls that may 27; throw in between. 28define i32 @test3(i32* %p, i32* %q) { 29; CHECK-LABEL: @test3(i32* %p, i32* %q) 30; CHECK: load i32, i32* %p, !alias.scope !1 31; CHECK: %c = add i32 %a, %a 32 %a = load i32, i32* %p, !alias.scope !1 33 %b = load i32, i32* %p, !alias.scope !2 34 %c = add i32 %a, %b 35 ret i32 %c 36} 37 38declare i32 @foo(i32*) readonly 39 40!0 = !{!0} 41!1 = !{!1} 42!2 = !{!0, !1} 43 44