[Reassociate] add testcases for more than 1 pairs - NFC

Author: Chen Zheng

llvm/test/Transforms/Reassociate/cse-pairs.ll

@@ -0,0 +1,83 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -reassociate -early-cse -S < %s | FileCheck %s
+
+@num1 = local_unnamed_addr global i32 0, align 4
+@num2 = local_unnamed_addr global i32 0, align 4
+@num3 = local_unnamed_addr global i32 0, align 4
+@num4 = local_unnamed_addr global i32 0, align 4
+
+define signext i32 @twoPairs(i32 signext %0, i32 signext %1, i32 signext %2, i32 signext %3, i32 signext %4) {
+; CHECK-LABEL: @twoPairs(
+; CHECK-NEXT:    [[TMP6:%.*]] = add i32 [[TMP2:%.*]], [[TMP0:%.*]]
+; CHECK-NEXT:    [[TMP7:%.*]] = add i32 [[TMP6]], [[TMP1:%.*]]
+; CHECK-NEXT:    [[TMP8:%.*]] = add i32 [[TMP7]], [[TMP3:%.*]]
+; CHECK-NEXT:    [[TMP9:%.*]] = add i32 [[TMP8]], [[TMP4:%.*]]
+; CHECK-NEXT:    store i32 [[TMP9]], i32* @num1, align 4
+; CHECK-NEXT:    store i32 [[TMP6]], i32* @num2, align 4
+; CHECK-NEXT:    [[TMP10:%.*]] = add nsw i32 [[TMP3]], [[TMP1]]
+; CHECK-NEXT:    store i32 [[TMP10]], i32* @num3, align 4
+; CHECK-NEXT:    ret i32 undef
+;
+  %6 = add i32 %2, %0
+  %7 = add i32 %6, %1
+  %8 = add i32 %7, %3
+  %9 = add i32 %8, %4
+  store i32 %9, i32* @num1, align 4
+  %10 = add nsw i32 %2, %0
+  store i32 %10, i32* @num2, align 4
+  %11 = add nsw i32 %3, %1
+  store i32 %11, i32* @num3, align 4
+  ret i32 undef
+}
+
+define signext i32 @twoPairsAllOpInPairs(i32 signext %0, i32 signext %1, i32 signext %2, i32 signext %3) {
+; CHECK-LABEL: @twoPairsAllOpInPairs(
+; CHECK-NEXT:    [[TMP5:%.*]] = add i32 [[TMP2:%.*]], [[TMP1:%.*]]
+; CHECK-NEXT:    [[TMP6:%.*]] = add i32 [[TMP5]], [[TMP0:%.*]]
+; CHECK-NEXT:    [[TMP7:%.*]] = add i32 [[TMP6]], [[TMP3:%.*]]
+; CHECK-NEXT:    store i32 [[TMP7]], i32* @num1, align 4
+; CHECK-NEXT:    store i32 [[TMP5]], i32* @num2, align 4
+; CHECK-NEXT:    [[TMP8:%.*]] = add nsw i32 [[TMP3]], [[TMP0]]
+; CHECK-NEXT:    store i32 [[TMP8]], i32* @num3, align 4
+; CHECK-NEXT:    ret i32 undef
+;
+  %5 = add nsw i32 %0, %1
+  %6 = add nsw i32 %5, %2
+  %7 = add nsw i32 %6, %3
+  store i32 %7, i32* @num1, align 4
+  %8 = add nsw i32 %1, %2
+  store i32 %8, i32* @num2, align 4
+  %9 = add nsw i32 %0, %3
+  store i32 %9, i32* @num3, align 4
+  ret i32 undef
+}
+
+define signext i32 @threePairsAllOpInPairs(i32 signext %0, i32 signext %1, i32 signext %2, i32 signext %3, i32 signext %4, i32 signext %5) {
+; CHECK-LABEL: @threePairsAllOpInPairs(
+; CHECK-NEXT:    [[TMP7:%.*]] = add i32 [[TMP3:%.*]], [[TMP2:%.*]]
+; CHECK-NEXT:    [[TMP8:%.*]] = add i32 [[TMP7]], [[TMP0:%.*]]
+; CHECK-NEXT:    [[TMP9:%.*]] = add i32 [[TMP8]], [[TMP1:%.*]]
+; CHECK-NEXT:    [[TMP10:%.*]] = add i32 [[TMP9]], [[TMP4:%.*]]
+; CHECK-NEXT:    [[TMP11:%.*]] = add i32 [[TMP10]], [[TMP5:%.*]]
+; CHECK-NEXT:    store i32 [[TMP11]], i32* @num1, align 4
+; CHECK-NEXT:    [[TMP12:%.*]] = add nsw i32 [[TMP5]], [[TMP0]]
+; CHECK-NEXT:    store i32 [[TMP12]], i32* @num2, align 4
+; CHECK-NEXT:    [[TMP13:%.*]] = add nsw i32 [[TMP4]], [[TMP1]]
+; CHECK-NEXT:    store i32 [[TMP13]], i32* @num3, align 4
+; CHECK-NEXT:    store i32 [[TMP7]], i32* @num4, align 4
+; CHECK-NEXT:    ret i32 undef
+;
+  %7 = add nsw i32 %0, %1
+  %8 = add nsw i32 %7, %2
+  %9 = add nsw i32 %8, %3
+  %10 = add nsw i32 %9, %4
+  %11 = add nsw i32 %10, %5
+  store i32 %11, i32* @num1, align 4
+  %12 = add nsw i32 %0, %5
+  store i32 %12, i32* @num2, align 4
+  %13 = add nsw i32 %1, %4
+  store i32 %13, i32* @num3, align 4
+  %14 = add nsw i32 %2, %3
+  store i32 %14, i32* @num4, align 4
+  ret i32 undef
+}