[InstComb] Pre-commit ashr-xor test

Author: artagnon

llvm/test/Transforms/InstCombine/shift-logic.ll

@@ -186,6 +186,7 @@ define i32 @ashr_xor(i32 %x, i32 %py) {
   ret i32 %sh1
 }
 
+
 define i32 @shr_mismatch_xor(i32 %x, i32 %y) {
 ; CHECK-LABEL: @shr_mismatch_xor(
 ; CHECK-NEXT:    [[SH0:%.*]] = ashr i32 [[X:%.*]], 5
@@ -225,6 +226,41 @@ define <2 x i32> @ashr_poison_poison_xor(<2 x i32> %x, <2 x i32> %y) {
   ret <2 x i32> %sh1
 }
 
+define i32 @ashr_xor_operand_match(i32 %x, i32 %y) {
+; CHECK-LABEL: @ashr_xor_operand_match(
+; CHECK-NEXT:    [[SH1:%.*]] = xor i32 [[TMP1:%.*]], [[TMP2:%.*]]
+; CHECK-NEXT:    [[RET:%.*]] = ashr i32 [[SH1]], [[TMP1]]
+; CHECK-NEXT:    ret i32 [[RET]]
+;
+  %r = xor i32 %x, %y
+  %ret = ashr i32 %r, %x
+  ret i32 %ret
+}
+
+define i32 @ashr_xor_operand_match_multiuse(i32 %x, i32 %y) {
+; CHECK-LABEL: @ashr_xor_operand_match_multiuse(
+; CHECK-NEXT:    [[R:%.*]] = xor i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[Q:%.*]] = ashr i32 [[R]], [[X]]
+; CHECK-NEXT:    [[RET:%.*]] = xor i32 [[R]], [[Q]]
+; CHECK-NEXT:    ret i32 [[RET]]
+;
+  %r = xor i32 %x, %y
+  %q = ashr i32 %r, %x
+  %ret = xor i32 %r, %q
+  ret i32 %ret
+}
+
+define i32 @ashr_xor_operand_mismtach(i32 %x, i32 %y) {
+; CHECK-LABEL: @ashr_xor_operand_mismtach(
+; CHECK-NEXT:    [[R:%.*]] = xor i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT:    [[RET:%.*]] = ashr i32 [[R]], [[Y]]
+; CHECK-NEXT:    ret i32 [[RET]]
+;
+  %r = xor i32 %x, %y
+  %ret = ashr i32 %r, %y
+  ret i32 %ret
+}
+
 define i32 @lshr_or_extra_use(i32 %x, i32 %y, ptr %p) {
 ; CHECK-LABEL: @lshr_or_extra_use(
 ; CHECK-NEXT:    [[SH0:%.*]] = lshr i32 [[X:%.*]], 5