| ; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s |
| ; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s |
| ; |
| ; This test ensures we don't end up with multiple reaching defs for a single |
| ; use/phi edge If we were to optimize defs, we would end up with 2= |
| ; MemoryDef(liveOnEntry) and 4 = MemoryDef(liveOnEntry) Both would mean both |
| ; 1,2, and 3,4 would reach the phi node. Because the phi node can only have one |
| ; entry on each edge, it would choose 2, 4 and disconnect 1 and 3 completely |
| ; from the SSA graph, even though they are not dead |
| |
| define void @sink_store(i32 %index, i32* %foo, i32* %bar) { |
| entry: |
| %cmp = trunc i32 %index to i1 |
| br i1 %cmp, label %if.then, label %if.else |
| |
| if.then: ; preds = %entry |
| ; CHECK: 1 = MemoryDef(liveOnEntry) |
| ; CHECK-NEXT: store i32 %index, i32* %foo, align 4 |
| store i32 %index, i32* %foo, align 4 |
| ; CHECK: 2 = MemoryDef(1) |
| ; CHECK-NEXT: store i32 %index, i32* %bar, align 4 |
| store i32 %index, i32* %bar, align 4 |
| br label %if.end |
| |
| if.else: ; preds = %entry |
| ; CHECK: 3 = MemoryDef(liveOnEntry) |
| ; CHECK-NEXT: store i32 %index, i32* %foo, align 4 |
| store i32 %index, i32* %foo, align 4 |
| ; CHECK: 4 = MemoryDef(3) |
| ; CHECK-NEXT: store i32 %index, i32* %bar, align 4 |
| store i32 %index, i32* %bar, align 4 |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| ; CHECK: 5 = MemoryPhi({if.then,2},{if.else,4}) |
| ; CHECK: MemoryUse(5) |
| ; CHECK-NEXT: %c = load i32, i32* %foo |
| %c = load i32, i32* %foo |
| ; CHECK: MemoryUse(5) |
| ; CHECK-NEXT: %d = load i32, i32* %bar |
| %d = load i32, i32* %bar |
| ret void |
| } |