[AggressiveInstCombine] add test for rotate insertion point; NFC
As noted in D55604 - we need a test to make sure that the new intrinsic
is inserted into a valid position.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349347 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Transforms/AggressiveInstCombine/rotate.ll b/test/Transforms/AggressiveInstCombine/rotate.ll
index 84a7d4a..8ed3825 100644
--- a/test/Transforms/AggressiveInstCombine/rotate.ll
+++ b/test/Transforms/AggressiveInstCombine/rotate.ll
@@ -96,6 +96,43 @@
ret i32 %cond
}
+; Verify that the intrinsic is inserted into a valid position.
+
+define i32 @rotl_insert_valid_location(i32 %a, i32 %b) {
+; CHECK-LABEL: @rotl_insert_valid_location(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[B:%.*]], 0
+; CHECK-NEXT: br i1 [[CMP]], label [[END:%.*]], label [[ROTBB:%.*]]
+; CHECK: rotbb:
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 32, [[B]]
+; CHECK-NEXT: [[SHR:%.*]] = lshr i32 [[A:%.*]], [[SUB]]
+; CHECK-NEXT: [[SHL:%.*]] = shl i32 [[A]], [[B]]
+; CHECK-NEXT: [[OR:%.*]] = or i32 [[SHR]], [[SHL]]
+; CHECK-NEXT: br label [[END]]
+; CHECK: end:
+; CHECK-NEXT: [[COND:%.*]] = phi i32 [ [[OR]], [[ROTBB]] ], [ [[A]], [[ENTRY:%.*]] ]
+; CHECK-NEXT: [[OTHER:%.*]] = phi i32 [ 1, [[ROTBB]] ], [ 2, [[ENTRY]] ]
+; CHECK-NEXT: [[RES:%.*]] = or i32 [[COND]], [[OTHER]]
+; CHECK-NEXT: ret i32 [[RES]]
+;
+entry:
+ %cmp = icmp eq i32 %b, 0
+ br i1 %cmp, label %end, label %rotbb
+
+rotbb:
+ %sub = sub i32 32, %b
+ %shr = lshr i32 %a, %sub
+ %shl = shl i32 %a, %b
+ %or = or i32 %shr, %shl
+ br label %end
+
+end:
+ %cond = phi i32 [ %or, %rotbb ], [ %a, %entry ]
+ %other = phi i32 [ 1, %rotbb ], [ 2, %entry ]
+ %res = or i32 %cond, %other
+ ret i32 %res
+}
+
define i32 @rotr(i32 %a, i32 %b) {
; CHECK-LABEL: @rotr(
; CHECK-NEXT: entry:
