aboutsummaryrefslogtreecommitdiffstats
path: root/test/CodeGen/X86/loop-strength-reduce.ll
diff options
context:
space:
mode:
Diffstat (limited to 'test/CodeGen/X86/loop-strength-reduce.ll')
-rw-r--r--test/CodeGen/X86/loop-strength-reduce.ll28
1 files changed, 28 insertions, 0 deletions
diff --git a/test/CodeGen/X86/loop-strength-reduce.ll b/test/CodeGen/X86/loop-strength-reduce.ll
new file mode 100644
index 0000000..5cf8d0a
--- /dev/null
+++ b/test/CodeGen/X86/loop-strength-reduce.ll
@@ -0,0 +1,28 @@
+; RUN: llvm-as < %s | llc -march=x86 -enable-x86-lsr | grep 'A(' | wc -l | grep 1
+;
+; Make sure the common loop invariant _A(reg) is hoisted up to preheader.
+
+%A = internal global [16 x [16 x int]] zeroinitializer, align 32
+
+void %test(int %row, int %N) {
+entry:
+ %N = cast int %N to uint
+ %tmp5 = setgt int %N, 0
+ br bool %tmp5, label %cond_true, label %return
+
+cond_true:
+ %indvar = phi uint [ 0, %entry ], [ %indvar.next, %cond_true ]
+ %i.0.0 = cast uint %indvar to int
+ %tmp2 = add int %i.0.0, 1
+ %tmp = getelementptr [16 x [16 x int]]* %A, int 0, int %row, int %tmp2
+ store int 4, int* %tmp
+ %tmp5 = add int %i.0.0, 2
+ %tmp7 = getelementptr [16 x [16 x int]]* %A, int 0, int %row, int %tmp5
+ store int 5, int* %tmp7
+ %indvar.next = add uint %indvar, 1
+ %exitcond = seteq uint %indvar.next, %N
+ br bool %exitcond, label %return, label %cond_true
+
+return:
+ ret void
+}