[ConstraintElim] Add pre-commit tests. NFC.

Author: dtcxzyw

llvm/test/Transforms/ConstraintElimination/sub-nsw.ll

@@ -0,0 +1,132 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
+
+define i1 @test_decompose_sub_nsw_sgt_nonneg(i32 %x, i32 %y) {
+; CHECK-LABEL: define i1 @test_decompose_sub_nsw_sgt_nonneg(
+; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[SUB:%.*]] = sub nsw i32 [[Y]], [[X]]
+; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SUB]], 10
+; CHECK-NEXT:    br i1 [[COND]], label %[[IF_THEN:.*]], label %[[IF_ELSE:.*]]
+; CHECK:       [[IF_THEN]]:
+; CHECK-NEXT:    [[RET:%.*]] = icmp slt i32 [[X]], [[Y]]
+; CHECK-NEXT:    ret i1 [[RET]]
+; CHECK:       [[IF_ELSE]]:
+; CHECK-NEXT:    ret i1 true
+;
+entry:
+  %sub = sub nsw i32 %y, %x
+  %cond = icmp sgt i32 %sub, 10
+  br i1 %cond, label %if.then, label %if.else
+
+if.then:
+  %ret = icmp slt i32 %x, %y
+  ret i1 %ret
+
+if.else:
+  ret i1 true
+}
+
+define i1 @test_decompose_sub_nsw_sgt_zero(i32 %x, i32 %y) {
+; CHECK-LABEL: define i1 @test_decompose_sub_nsw_sgt_zero(
+; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[SUB:%.*]] = sub nsw i32 [[Y]], [[X]]
+; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SUB]], 0
+; CHECK-NEXT:    br i1 [[COND]], label %[[IF_THEN:.*]], label %[[IF_ELSE:.*]]
+; CHECK:       [[IF_THEN]]:
+; CHECK-NEXT:    [[RET:%.*]] = icmp slt i32 [[X]], [[Y]]
+; CHECK-NEXT:    ret i1 [[RET]]
+; CHECK:       [[IF_ELSE]]:
+; CHECK-NEXT:    ret i1 true
+;
+entry:
+  %sub = sub nsw i32 %y, %x
+  %cond = icmp sgt i32 %sub, 0
+  br i1 %cond, label %if.then, label %if.else
+
+if.then:
+  %ret = icmp slt i32 %x, %y
+  ret i1 %ret
+
+if.else:
+  ret i1 true
+}
+
+define i1 @test_decompose_sub_nsw_sgt_zero_inv(i32 %x, i32 %y) {
+; CHECK-LABEL: define i1 @test_decompose_sub_nsw_sgt_zero_inv(
+; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[SUB:%.*]] = sub nsw i32 [[Y]], [[X]]
+; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SUB]], 10
+; CHECK-NEXT:    br i1 [[COND]], label %[[IF_THEN:.*]], label %[[IF_ELSE:.*]]
+; CHECK:       [[IF_THEN]]:
+; CHECK-NEXT:    [[RET:%.*]] = icmp sge i32 [[X]], [[Y]]
+; CHECK-NEXT:    ret i1 [[RET]]
+; CHECK:       [[IF_ELSE]]:
+; CHECK-NEXT:    ret i1 true
+;
+entry:
+  %sub = sub nsw i32 %y, %x
+  %cond = icmp sgt i32 %sub, 10
+  br i1 %cond, label %if.then, label %if.else
+
+if.then:
+  %ret = icmp sge i32 %x, %y
+  ret i1 %ret
+
+if.else:
+  ret i1 true
+}
+
+define i1 @test_decompose_sub_nonsw_sgt_zero(i32 %x, i32 %y) {
+; CHECK-LABEL: define i1 @test_decompose_sub_nonsw_sgt_zero(
+; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[Y]], [[X]]
+; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SUB]], 10
+; CHECK-NEXT:    br i1 [[COND]], label %[[IF_THEN:.*]], label %[[IF_ELSE:.*]]
+; CHECK:       [[IF_THEN]]:
+; CHECK-NEXT:    [[RET:%.*]] = icmp slt i32 [[X]], [[Y]]
+; CHECK-NEXT:    ret i1 [[RET]]
+; CHECK:       [[IF_ELSE]]:
+; CHECK-NEXT:    ret i1 true
+;
+entry:
+  %sub = sub i32 %y, %x
+  %cond = icmp sgt i32 %sub, 10
+  br i1 %cond, label %if.then, label %if.else
+
+if.then:
+  %ret = icmp slt i32 %x, %y
+  ret i1 %ret
+
+if.else:
+  ret i1 true
+}
+
+define i1 @test_decompose_sub_nsw_sgt_neg(i32 %x, i32 %y) {
+; CHECK-LABEL: define i1 @test_decompose_sub_nsw_sgt_neg(
+; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[SUB:%.*]] = sub nsw i32 [[Y]], [[X]]
+; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i32 [[SUB]], -10
+; CHECK-NEXT:    br i1 [[COND]], label %[[IF_THEN:.*]], label %[[IF_ELSE:.*]]
+; CHECK:       [[IF_THEN]]:
+; CHECK-NEXT:    [[RET:%.*]] = icmp slt i32 [[X]], [[Y]]
+; CHECK-NEXT:    ret i1 [[RET]]
+; CHECK:       [[IF_ELSE]]:
+; CHECK-NEXT:    ret i1 true
+;
+entry:
+  %sub = sub nsw i32 %y, %x
+  %cond = icmp sgt i32 %sub, -10
+  br i1 %cond, label %if.then, label %if.else
+
+if.then:
+  %ret = icmp slt i32 %x, %y
+  ret i1 %ret
+
+if.else:
+  ret i1 true
+}