| ; RUN: opt -passes=gvn -S < %s | FileCheck %s |
| |
| target datalayout = "e-p:64:64:64" |
| |
| ; GVN should ignore the store to p[1] to see that the load from p[0] is |
| ; fully redundant. |
| |
| ; CHECK-LABEL: @yes( |
| ; CHECK: if.then: |
| ; CHECK-NEXT: store i32 0, ptr %q |
| ; CHECK-NEXT: ret void |
| |
| define void @yes(i1 %c, ptr %p, ptr %q) nounwind { |
| entry: |
| store i32 0, ptr %p |
| %p1 = getelementptr inbounds i32, ptr %p, i64 1 |
| store i32 1, ptr %p1 |
| br i1 %c, label %if.else, label %if.then |
| |
| if.then: |
| %t = load i32, ptr %p |
| store i32 %t, ptr %q |
| ret void |
| |
| if.else: |
| ret void |
| } |
| |
| ; GVN should ignore the store to p[1] to see that the first load from p[0] is |
| ; fully redundant. However, the second load is larger, so it's not a simple |
| ; redundancy. |
| |
| ; CHECK-LABEL: @watch_out_for_size_change( |
| ; CHECK: if.then: |
| ; CHECK-NEXT: store i32 0, ptr %q |
| ; CHECK-NEXT: ret void |
| ; CHECK: if.else: |
| ; CHECK: load i64, ptr %p |
| ; CHECK: store i64 |
| |
| define void @watch_out_for_size_change(i1 %c, ptr %p, ptr %q) nounwind { |
| entry: |
| store i32 0, ptr %p |
| %p1 = getelementptr inbounds i32, ptr %p, i64 1 |
| store i32 1, ptr %p1 |
| br i1 %c, label %if.else, label %if.then |
| |
| if.then: |
| %t = load i32, ptr %p |
| store i32 %t, ptr %q |
| ret void |
| |
| if.else: |
| %t64 = load i64, ptr %p |
| store i64 %t64, ptr %q |
| ret void |
| } |