| ; This testcase tests for a problem where LICM hoists loads out of a loop |
| ; despite the fact that calls to unknown functions may modify what is being |
| ; loaded from. Basically if the load gets hoisted, the subtract gets turned |
| ; into a constant zero. |
| ; |
| ; RUN: llvm-as < %s | opt -licm -load-vn -gcse -instcombine | llvm-dis | grep load |
| |
| %X = global int 7 |
| declare void %foo() |
| |
| int %test(bool %c) { |
| %A = load int *%X |
| br label %Loop |
| Loop: |
| call void %foo() |
| %B = load int *%X ;; Should not hoist this load! |
| br bool %c, label %Loop, label %Out |
| Out: |
| %C = sub int %A, %B |
| ret int %C |
| } |
