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6382ee0e42
As the test change shows, we can increase the critical path by adding a 'not' instruction, so make sure that we're actually removing an instruction if we do this transform. This transform could also cause us to miss folds of min/max pairs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286315 91177308-0d34-0410-b5e6-96231b3b80d8
193 lines
6.6 KiB
LLVM
193 lines
6.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -instcombine < %s | FileCheck %s
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define i32 @compute_min_2(i32 %x, i32 %y) {
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; CHECK-LABEL: @compute_min_2(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp slt i32 %x, %y
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; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 %x, i32 %y
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; CHECK-NEXT: ret i32 [[TMP2]]
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;
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%not_x = sub i32 -1, %x
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%not_y = sub i32 -1, %y
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%cmp = icmp sgt i32 %not_x, %not_y
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%not_min = select i1 %cmp, i32 %not_x, i32 %not_y
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%min = sub i32 -1, %not_min
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ret i32 %min
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}
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define i32 @compute_min_3(i32 %x, i32 %y, i32 %z) {
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; CHECK-LABEL: @compute_min_3(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp slt i32 %x, %y
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; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 %x, i32 %y
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; CHECK-NEXT: [[TMP3:%.*]] = icmp slt i32 [[TMP2]], %z
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; CHECK-NEXT: [[TMP4:%.*]] = select i1 [[TMP3]], i32 [[TMP2]], i32 %z
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; CHECK-NEXT: ret i32 [[TMP4]]
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;
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%not_x = sub i32 -1, %x
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%not_y = sub i32 -1, %y
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%not_z = sub i32 -1, %z
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%cmp_1 = icmp sgt i32 %not_x, %not_y
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%not_min_1 = select i1 %cmp_1, i32 %not_x, i32 %not_y
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%cmp_2 = icmp sgt i32 %not_min_1, %not_z
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%not_min_2 = select i1 %cmp_2, i32 %not_min_1, i32 %not_z
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%min = sub i32 -1, %not_min_2
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ret i32 %min
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}
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; Don't increase the critical path by moving the 'not' op after the 'select'.
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define i32 @compute_min_arithmetic(i32 %x, i32 %y) {
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; CHECK-LABEL: @compute_min_arithmetic(
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; CHECK-NEXT: [[NOT_VALUE:%.*]] = sub i32 3, %x
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; CHECK-NEXT: [[NOT_Y:%.*]] = xor i32 %y, -1
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[NOT_VALUE]], [[NOT_Y]]
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; CHECK-NEXT: [[NOT_MIN:%.*]] = select i1 [[CMP]], i32 [[NOT_VALUE]], i32 [[NOT_Y]]
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; CHECK-NEXT: ret i32 [[NOT_MIN]]
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;
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%not_value = sub i32 3, %x
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%not_y = sub i32 -1, %y
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%cmp = icmp sgt i32 %not_value, %not_y
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%not_min = select i1 %cmp, i32 %not_value, i32 %not_y
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ret i32 %not_min
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}
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declare void @fake_use(i32)
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define i32 @compute_min_pessimization(i32 %x, i32 %y) {
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; CHECK-LABEL: @compute_min_pessimization(
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; CHECK-NEXT: [[NOT_VALUE:%.*]] = sub i32 3, %x
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; CHECK-NEXT: call void @fake_use(i32 [[NOT_VALUE]])
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; CHECK-NEXT: [[NOT_Y:%.*]] = xor i32 %y, -1
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[NOT_VALUE]], [[NOT_Y]]
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; CHECK-NEXT: [[NOT_MIN:%.*]] = select i1 [[CMP]], i32 [[NOT_VALUE]], i32 [[NOT_Y]]
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; CHECK-NEXT: [[MIN:%.*]] = xor i32 [[NOT_MIN]], -1
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; CHECK-NEXT: ret i32 [[MIN]]
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;
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%not_value = sub i32 3, %x
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call void @fake_use(i32 %not_value)
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%not_y = sub i32 -1, %y
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%cmp = icmp sgt i32 %not_value, %not_y
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%not_min = select i1 %cmp, i32 %not_value, i32 %not_y
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%min = sub i32 -1, %not_min
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ret i32 %min
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}
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define i32 @max_of_nots(i32 %x, i32 %y) {
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; CHECK-LABEL: @max_of_nots(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt i32 %y, 0
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; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 %y, i32 0
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; CHECK-NEXT: [[TMP3:%.*]] = icmp slt i32 [[TMP2]], %x
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; CHECK-NEXT: [[TMP4:%.*]] = select i1 [[TMP3]], i32 [[TMP2]], i32 %x
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; CHECK-NEXT: [[TMP5:%.*]] = xor i32 [[TMP4]], -1
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; CHECK-NEXT: ret i32 [[TMP5]]
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;
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%c0 = icmp sgt i32 %y, 0
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%xor_y = xor i32 %y, -1
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%s0 = select i1 %c0, i32 %xor_y, i32 -1
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%xor_x = xor i32 %x, -1
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%c1 = icmp slt i32 %s0, %xor_x
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%smax96 = select i1 %c1, i32 %xor_x, i32 %s0
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ret i32 %smax96
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}
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define <2 x i32> @max_of_nots_vec(<2 x i32> %x, <2 x i32> %y) {
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; CHECK-LABEL: @max_of_nots_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt <2 x i32> %y, zeroinitializer
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; CHECK-NEXT: [[TMP2:%.*]] = select <2 x i1> [[TMP1]], <2 x i32> %y, <2 x i32> zeroinitializer
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; CHECK-NEXT: [[TMP3:%.*]] = icmp slt <2 x i32> [[TMP2]], %x
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; CHECK-NEXT: [[TMP4:%.*]] = select <2 x i1> [[TMP3]], <2 x i32> [[TMP2]], <2 x i32> %x
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; CHECK-NEXT: [[TMP5:%.*]] = xor <2 x i32> [[TMP4]], <i32 -1, i32 -1>
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; CHECK-NEXT: ret <2 x i32> [[TMP5]]
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;
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%c0 = icmp sgt <2 x i32> %y, zeroinitializer
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%xor_y = xor <2 x i32> %y, <i32 -1, i32 -1>
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%s0 = select <2 x i1> %c0, <2 x i32> %xor_y, <2 x i32> <i32 -1, i32 -1>
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%xor_x = xor <2 x i32> %x, <i32 -1, i32 -1>
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%c1 = icmp slt <2 x i32> %s0, %xor_x
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%smax96 = select <2 x i1> %c1, <2 x i32> %xor_x, <2 x i32> %s0
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ret <2 x i32> %smax96
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}
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define <2 x i37> @max_of_nots_weird_type_vec(<2 x i37> %x, <2 x i37> %y) {
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; CHECK-LABEL: @max_of_nots_weird_type_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt <2 x i37> %y, zeroinitializer
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; CHECK-NEXT: [[TMP2:%.*]] = select <2 x i1> [[TMP1]], <2 x i37> %y, <2 x i37> zeroinitializer
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; CHECK-NEXT: [[TMP3:%.*]] = icmp slt <2 x i37> [[TMP2]], %x
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; CHECK-NEXT: [[TMP4:%.*]] = select <2 x i1> [[TMP3]], <2 x i37> [[TMP2]], <2 x i37> %x
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; CHECK-NEXT: [[TMP5:%.*]] = xor <2 x i37> [[TMP4]], <i37 -1, i37 -1>
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; CHECK-NEXT: ret <2 x i37> [[TMP5]]
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;
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%c0 = icmp sgt <2 x i37> %y, zeroinitializer
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%xor_y = xor <2 x i37> %y, <i37 -1, i37 -1>
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%s0 = select <2 x i1> %c0, <2 x i37> %xor_y, <2 x i37> <i37 -1, i37 -1>
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%xor_x = xor <2 x i37> %x, <i37 -1, i37 -1>
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%c1 = icmp slt <2 x i37> %s0, %xor_x
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%smax96 = select <2 x i1> %c1, <2 x i37> %xor_x, <2 x i37> %s0
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ret <2 x i37> %smax96
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}
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; max(min(%a, -1), -1) == -1
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define i32 @max_of_min(i32 %a) {
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; CHECK-LABEL: @max_of_min(
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; CHECK-NEXT: ret i32 -1
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;
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%not_a = xor i32 %a, -1
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%c0 = icmp sgt i32 %a, 0
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%s0 = select i1 %c0, i32 %not_a, i32 -1
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%c1 = icmp sgt i32 %s0, -1
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%s1 = select i1 %c1, i32 %s0, i32 -1
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ret i32 %s1
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}
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; max(min(%a, -1), -1) == -1 (swap predicate and select ops)
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define i32 @max_of_min_swap(i32 %a) {
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; CHECK-LABEL: @max_of_min_swap(
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; CHECK-NEXT: ret i32 -1
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;
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%not_a = xor i32 %a, -1
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%c0 = icmp slt i32 %a, 0
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%s0 = select i1 %c0, i32 -1, i32 %not_a
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%c1 = icmp sgt i32 %s0, -1
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%s1 = select i1 %c1, i32 %s0, i32 -1
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ret i32 %s1
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}
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; min(max(%a, -1), -1) == -1
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define i32 @min_of_max(i32 %a) {
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; CHECK-LABEL: @min_of_max(
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; CHECK-NEXT: ret i32 -1
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;
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%not_a = xor i32 %a, -1
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%c0 = icmp slt i32 %a, 0
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%s0 = select i1 %c0, i32 %not_a, i32 -1
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%c1 = icmp slt i32 %s0, -1
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%s1 = select i1 %c1, i32 %s0, i32 -1
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ret i32 %s1
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}
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; min(max(%a, -1), -1) == -1 (swap predicate and select ops)
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define i32 @min_of_max_swap(i32 %a) {
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; CHECK-LABEL: @min_of_max_swap(
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; CHECK-NEXT: ret i32 -1
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;
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%not_a = xor i32 %a, -1
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%c0 = icmp sgt i32 %a, 0
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%s0 = select i1 %c0, i32 -1, i32 %not_a
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%c1 = icmp slt i32 %s0, -1
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%s1 = select i1 %c1, i32 %s0, i32 -1
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ret i32 %s1
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}
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define <2 x i32> @max_of_min_vec(<2 x i32> %a) {
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; CHECK-LABEL: @max_of_min_vec(
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; CHECK-NEXT: ret <2 x i32> <i32 -1, i32 -1>
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;
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%not_a = xor <2 x i32> %a, <i32 -1, i32 -1>
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%c0 = icmp sgt <2 x i32> %a, zeroinitializer
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%s0 = select <2 x i1> %c0, <2 x i32> %not_a, <2 x i32> <i32 -1, i32 -1>
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%c1 = icmp sgt <2 x i32> %s0, <i32 -1, i32 -1>
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%s1 = select <2 x i1> %c1, <2 x i32> %s0, <2 x i32> <i32 -1, i32 -1>
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ret <2 x i32> %s1
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}
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