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Dec 30, 2023
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[ConstraintElim] Add tests for llvm.abs #76374

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125 changes: 125 additions & 0 deletions llvm/test/Transforms/ConstraintElimination/abs.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s

define i1 @abs_int_min_is_not_poison(i32 %arg) {
; CHECK-LABEL: define i1 @abs_int_min_is_not_poison(
; CHECK-SAME: i32 [[ARG:%.*]]) {
; CHECK-NEXT: [[ABS:%.*]] = tail call i32 @llvm.abs.i32(i32 [[ARG]], i1 false)
; CHECK-NEXT: [[CMP:%.*]] = icmp sge i32 [[ABS]], [[ARG]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%abs = tail call i32 @llvm.abs.i32(i32 %arg, i1 false)
%cmp = icmp sge i32 %abs, %arg
ret i1 %cmp
}

define i1 @abs_int_min_is_poison(i32 %arg) {
; CHECK-LABEL: define i1 @abs_int_min_is_poison(
; CHECK-SAME: i32 [[ARG:%.*]]) {
; CHECK-NEXT: [[ABS:%.*]] = tail call i32 @llvm.abs.i32(i32 [[ARG]], i1 true)
; CHECK-NEXT: [[CMP:%.*]] = icmp sge i32 [[ABS]], [[ARG]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%abs = tail call i32 @llvm.abs.i32(i32 %arg, i1 true)
%cmp = icmp sge i32 %abs, %arg
ret i1 %cmp
}

define i1 @abs_plus_one(i32 %arg) {
; CHECK-LABEL: define i1 @abs_plus_one(
; CHECK-SAME: i32 [[ARG:%.*]]) {
; CHECK-NEXT: [[ABS:%.*]] = tail call i32 @llvm.abs.i32(i32 [[ARG]], i1 true)
; CHECK-NEXT: [[ABS_PLUS_ONE:%.*]] = add nsw i32 [[ABS]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp sge i32 [[ABS_PLUS_ONE]], [[ARG]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%abs = tail call i32 @llvm.abs.i32(i32 %arg, i1 true)
%abs_plus_one = add nsw i32 %abs, 1
%cmp = icmp sge i32 %abs_plus_one, %arg
ret i1 %cmp
}

define i1 @arg_minus_one_strict_less(i32 %arg) {
; CHECK-LABEL: define i1 @arg_minus_one_strict_less(
; CHECK-SAME: i32 [[ARG:%.*]]) {
; CHECK-NEXT: [[ABS:%.*]] = tail call i32 @llvm.abs.i32(i32 [[ARG]], i1 true)
; CHECK-NEXT: [[ARG_MINUS_ONE:%.*]] = add nsw i32 [[ARG]], -1
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[ARG_MINUS_ONE]], [[ABS]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%abs = tail call i32 @llvm.abs.i32(i32 %arg, i1 true)
%arg_minus_one = add nsw i32 %arg, -1
%cmp = icmp slt i32 %arg_minus_one, %abs
ret i1 %cmp
}

define i1 @arg_minus_one_strict_greater(i32 %arg) {
; CHECK-LABEL: define i1 @arg_minus_one_strict_greater(
; CHECK-SAME: i32 [[ARG:%.*]]) {
; CHECK-NEXT: [[ABS:%.*]] = tail call i32 @llvm.abs.i32(i32 [[ARG]], i1 true)
; CHECK-NEXT: [[ARG_MINUS_ONE:%.*]] = add nsw i32 [[ARG]], -1
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[ARG_MINUS_ONE]], [[ABS]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%abs = tail call i32 @llvm.abs.i32(i32 %arg, i1 true)
%arg_minus_one = add nsw i32 %arg, -1
%cmp = icmp sgt i32 %arg_minus_one, %abs
ret i1 %cmp
}

define i1 @abs_plus_one_unsigned_greater_or_equal_nonnegative_arg(i32 %arg) {
; CHECK-LABEL: define i1 @abs_plus_one_unsigned_greater_or_equal_nonnegative_arg(
; CHECK-SAME: i32 [[ARG:%.*]]) {
; CHECK-NEXT: [[CMP_ARG_NONNEGATIVE:%.*]] = icmp sge i32 [[ARG]], 0
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP_ARG_NONNEGATIVE]])
; CHECK-NEXT: [[ABS:%.*]] = tail call i32 @llvm.abs.i32(i32 [[ARG]], i1 true)
; CHECK-NEXT: [[ABS_PLUS_ONE:%.*]] = add nuw i32 [[ABS]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp uge i32 [[ABS_PLUS_ONE]], [[ARG]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%cmp_arg_nonnegative = icmp sge i32 %arg, 0
call void @llvm.assume(i1 %cmp_arg_nonnegative)
%abs = tail call i32 @llvm.abs.i32(i32 %arg, i1 true)
%abs_plus_one = add nuw i32 %abs, 1
%cmp = icmp uge i32 %abs_plus_one, %arg
ret i1 %cmp
}

define i1 @abs_plus_one_unsigned_greater_or_equal_cannot_be_simplified(i32 %arg) {
; CHECK-LABEL: define i1 @abs_plus_one_unsigned_greater_or_equal_cannot_be_simplified(
; CHECK-SAME: i32 [[ARG:%.*]]) {
; CHECK-NEXT: [[ABS:%.*]] = tail call i32 @llvm.abs.i32(i32 [[ARG]], i1 true)
; CHECK-NEXT: [[ABS_PLUS_ONE:%.*]] = add nuw i32 [[ABS]], 1
; CHECK-NEXT: [[CMP:%.*]] = icmp uge i32 [[ABS_PLUS_ONE]], [[ARG]]
; CHECK-NEXT: ret i1 [[CMP]]
;
%abs = tail call i32 @llvm.abs.i32(i32 %arg, i1 true)
%abs_plus_one = add nuw i32 %abs, 1
%cmp = icmp uge i32 %abs_plus_one, %arg
ret i1 %cmp
}

define i1 @abs_constant_negative_arg() {
; CHECK-LABEL: define i1 @abs_constant_negative_arg() {
; CHECK-NEXT: [[ABS:%.*]] = tail call i32 @llvm.abs.i32(i32 -3, i1 false)
; CHECK-NEXT: [[CMP:%.*]] = icmp sge i32 [[ABS]], 3
; CHECK-NEXT: ret i1 [[CMP]]
;
%abs = tail call i32 @llvm.abs.i32(i32 -3, i1 false)
%cmp = icmp sge i32 %abs, 3
ret i1 %cmp
}

define i1 @abs_constant_positive_arg() {
; CHECK-LABEL: define i1 @abs_constant_positive_arg() {
; CHECK-NEXT: [[ABS:%.*]] = tail call i32 @llvm.abs.i32(i32 3, i1 false)
; CHECK-NEXT: [[CMP:%.*]] = icmp sge i32 [[ABS]], 3
; CHECK-NEXT: ret i1 [[CMP]]
;
%abs = tail call i32 @llvm.abs.i32(i32 3, i1 false)
%cmp = icmp sge i32 %abs, 3
ret i1 %cmp
}

declare i32 @llvm.abs.i32(i32, i1 immarg)
declare void @llvm.assume(i1)