[InstSimplify] add tests for ctlz-of-shift-constant; NFC

diff --git a/llvm/test/Transforms/InstSimplify/call.ll b/llvm/test/Transforms/InstSimplify/call.ll
index 77cd0bc..6245a9b 100644 (file)
--- a/llvm/test/Transforms/InstSimplify/call.ll
+++ b/llvm/test/Transforms/InstSimplify/call.ll
@@ -1406,6 +1406,17 @@ define i32 @ctlz_lshr_sign_bit(i32 %x) {
   ret i32 %r
 }
 
+define i32 @ctlz_lshr_negative(i32 %x) {
+; CHECK-LABEL: @ctlz_lshr_negative(
+; CHECK-NEXT:    [[S:%.*]] = lshr i32 -42, [[X:%.*]]
+; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.ctlz.i32(i32 [[S]], i1 true)
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %s = lshr i32 -42, %x
+  %r = call i32 @llvm.ctlz.i32(i32 %s, i1 true)
+  ret i32 %r
+}
+
 define <3 x i33> @ctlz_lshr_sign_bit_vec(<3 x i33> %x) {
 ; CHECK-LABEL: @ctlz_lshr_sign_bit_vec(
 ; CHECK-NEXT:    ret <3 x i33> [[X:%.*]]
@@ -1441,6 +1452,17 @@ define i32 @ctlz_ashr_sign_bit(i32 %x) {
   ret i32 %r
 }
 
+define i32 @ctlz_ashr_negative(i32 %x) {
+; CHECK-LABEL: @ctlz_ashr_negative(
+; CHECK-NEXT:    [[S:%.*]] = ashr i32 -42, [[X:%.*]]
+; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.ctlz.i32(i32 [[S]], i1 false)
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %s = ashr i32 -42, %x
+  %r = call i32 @llvm.ctlz.i32(i32 %s, i1 false)
+  ret i32 %r
+}
+
 define <3 x i33> @ctlz_ashr_sign_bit_vec(<3 x i33> %x) {
 ; CHECK-LABEL: @ctlz_ashr_sign_bit_vec(
 ; CHECK-NEXT:    [[S:%.*]] = ashr <3 x i33> <i33 -4294967296, i33 undef, i33 -4294967296>, [[X:%.*]]