summaryrefslogtreecommitdiffstats
path: root/llvm/test/Transforms/LICM/2003-05-02-LoadHoist.ll
diff options
context:
space:
mode:
Diffstat (limited to 'llvm/test/Transforms/LICM/2003-05-02-LoadHoist.ll')
-rw-r--r--llvm/test/Transforms/LICM/2003-05-02-LoadHoist.ll21
1 files changed, 21 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LICM/2003-05-02-LoadHoist.ll b/llvm/test/Transforms/LICM/2003-05-02-LoadHoist.ll
new file mode 100644
index 00000000000..ce13e6d57e4
--- /dev/null
+++ b/llvm/test/Transforms/LICM/2003-05-02-LoadHoist.ll
@@ -0,0 +1,21 @@
+; 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-upgrade < %s | llvm-as | 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
+}
OpenPOWER on IntegriCloud