forked from OSchip/llvm-project
[InstCombine][NFC] Some tests for usub overflow+nonzero check improvement (PR43251)
https://rise4fun.com/Alive/kHq https://bugs.llvm.org/show_bug.cgi?id=43251 llvm-svn: 371352
This commit is contained in:
Roman Lebedev
parent
77dd86ee4a
commit
139a9d6c0e
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@ -0,0 +1,343 @@
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; 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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; Here we subtract two values, check that subtraction did not overflow AND
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; that the result is non-zero. This can be simplified just to a comparison
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; between the base and offset.
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declare void @use8(i8)
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declare void @use1(i1)
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declare {i8, i1} @llvm.usub.with.overflow(i8, i8)
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declare void @useagg({i8, i1})
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; There is a number of base patterns..
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define i1 @t0_noncanonical_ignoreme(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t0_noncanonical_ignoreme(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
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; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%no_underflow = icmp ule i8 %adjusted, %base
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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call void @use1(i1 %not_null)
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%r = and i1 %not_null, %no_underflow
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ret i1 %r
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}
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define i1 @t1(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t1(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
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; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%no_underflow = icmp uge i8 %base, %offset
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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call void @use1(i1 %not_null)
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%r = and i1 %not_null, %no_underflow
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ret i1 %r
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}
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define i1 @t2(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t2(
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; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
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; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
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; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
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; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = xor i1 [[UNDERFLOW]], true
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
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call void @useagg({i8, i1} %agg)
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%adjusted = extractvalue {i8, i1} %agg, 0
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call void @use8(i8 %adjusted)
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%underflow = extractvalue {i8, i1} %agg, 1
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call void @use1(i1 %underflow)
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%no_underflow = xor i1 %underflow, -1
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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%r = and i1 %not_null, %no_underflow
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ret i1 %r
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}
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; Commutativity
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define i1 @t3_commutability0(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t3_commutability0(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
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; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%no_underflow = icmp ule i8 %offset, %base ; swapped
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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call void @use1(i1 %not_null)
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%r = and i1 %not_null, %no_underflow
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ret i1 %r
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}
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define i1 @t4_commutability1(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t4_commutability1(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
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; CHECK-NEXT: [[R:%.*]] = and i1 [[NO_UNDERFLOW]], [[NOT_NULL]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%no_underflow = icmp ule i8 %base, %offset ; swapped
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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call void @use1(i1 %not_null)
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%r = and i1 %no_underflow, %not_null ; swapped
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ret i1 %r
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}
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define i1 @t5_commutability2(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t5_commutability2(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
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; CHECK-NEXT: [[R:%.*]] = and i1 [[NO_UNDERFLOW]], [[NOT_NULL]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%no_underflow = icmp ule i8 %offset, %base ; swapped
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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call void @use1(i1 %not_null)
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%r = and i1 %no_underflow, %not_null ; swapped
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ret i1 %r
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}
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define i1 @t6_commutability(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t6_commutability(
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; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
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; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
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; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
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; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = xor i1 [[UNDERFLOW]], true
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: [[R:%.*]] = and i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
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call void @useagg({i8, i1} %agg)
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%adjusted = extractvalue {i8, i1} %agg, 0
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call void @use8(i8 %adjusted)
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%underflow = extractvalue {i8, i1} %agg, 1
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call void @use1(i1 %underflow)
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%no_underflow = xor i1 %underflow, -1
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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%r = and i1 %no_underflow, %not_null ; swapped
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ret i1 %r
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}
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; What if we were checking the opposite question, that we either got null,
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; or overflow happened?
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define i1 @t7(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t7(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
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; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NULL]])
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; CHECK-NEXT: [[R:%.*]] = or i1 [[NULL]], [[UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%underflow = icmp ugt i8 %adjusted, %base
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call void @use1(i1 %underflow)
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%null = icmp eq i8 %adjusted, 0
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call void @use1(i1 %null)
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%r = or i1 %null, %underflow
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ret i1 %r
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}
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define i1 @t8(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t8(
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; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
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; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
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; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
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; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
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; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
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; CHECK-NEXT: [[R:%.*]] = or i1 [[NULL]], [[UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
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call void @useagg({i8, i1} %agg)
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%adjusted = extractvalue {i8, i1} %agg, 0
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call void @use8(i8 %adjusted)
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%underflow = extractvalue {i8, i1} %agg, 1
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call void @use1(i1 %underflow)
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%null = icmp eq i8 %adjusted, 0
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%r = or i1 %null, %underflow
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ret i1 %r
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}
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; And these patterns also have commutative variants
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define i1 @t9_commutative(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t9_commutative(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
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; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NULL]])
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; CHECK-NEXT: [[R:%.*]] = or i1 [[NULL]], [[UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%underflow = icmp ult i8 %base, %adjusted ; swapped
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call void @use1(i1 %underflow)
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%null = icmp eq i8 %adjusted, 0
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call void @use1(i1 %null)
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%r = or i1 %null, %underflow
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ret i1 %r
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}
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;-------------------------------------------------------------------------------
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; If we are checking that we either did not get null or got no overflow,
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; this is tautological and is always true.
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define i1 @t10(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t10(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NOT_NULL]])
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; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%no_underflow = icmp uge i8 %base, %offset
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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call void @use1(i1 %not_null)
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%r = or i1 %not_null, %no_underflow
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ret i1 %r
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}
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define i1 @t11(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t11(
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; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
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; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
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; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
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; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = xor i1 [[UNDERFLOW]], true
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i8 [[ADJUSTED]], 0
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; CHECK-NEXT: [[R:%.*]] = or i1 [[NOT_NULL]], [[NO_UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
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call void @useagg({i8, i1} %agg)
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%adjusted = extractvalue {i8, i1} %agg, 0
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call void @use8(i8 %adjusted)
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%underflow = extractvalue {i8, i1} %agg, 1
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call void @use1(i1 %underflow)
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%no_underflow = xor i1 %underflow, -1
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call void @use1(i1 %no_underflow)
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%not_null = icmp ne i8 %adjusted, 0
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%r = or i1 %not_null, %no_underflow
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ret i1 %r
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}
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; Likewise, if we are checking that we both got null and overflow happened,
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; it makes no sense and is always false.
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define i1 @t12(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t12(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[UNDERFLOW:%.*]] = icmp ult i8 [[BASE]], [[OFFSET]]
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; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
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; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
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; CHECK-NEXT: call void @use1(i1 [[NULL]])
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; CHECK-NEXT: [[R:%.*]] = and i1 [[NULL]], [[UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%adjusted = sub i8 %base, %offset
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call void @use8(i8 %adjusted)
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%underflow = icmp ugt i8 %adjusted, %base
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call void @use1(i1 %underflow)
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%null = icmp eq i8 %adjusted, 0
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call void @use1(i1 %null)
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%r = and i1 %null, %underflow
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ret i1 %r
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}
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define i1 @t13(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t13(
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; CHECK-NEXT: [[AGG:%.*]] = call { i8, i1 } @llvm.usub.with.overflow.i8(i8 [[BASE:%.*]], i8 [[OFFSET:%.*]])
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; CHECK-NEXT: call void @useagg({ i8, i1 } [[AGG]])
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; CHECK-NEXT: [[ADJUSTED:%.*]] = extractvalue { i8, i1 } [[AGG]], 0
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; CHECK-NEXT: call void @use8(i8 [[ADJUSTED]])
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; CHECK-NEXT: [[UNDERFLOW:%.*]] = extractvalue { i8, i1 } [[AGG]], 1
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; CHECK-NEXT: call void @use1(i1 [[UNDERFLOW]])
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; CHECK-NEXT: [[NULL:%.*]] = icmp eq i8 [[ADJUSTED]], 0
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; CHECK-NEXT: [[R:%.*]] = and i1 [[NULL]], [[UNDERFLOW]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%agg = call {i8, i1} @llvm.usub.with.overflow(i8 %base, i8 %offset)
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call void @useagg({i8, i1} %agg)
|
||||
%adjusted = extractvalue {i8, i1} %agg, 0
|
||||
call void @use8(i8 %adjusted)
|
||||
%underflow = extractvalue {i8, i1} %agg, 1
|
||||
call void @use1(i1 %underflow)
|
||||
%null = icmp eq i8 %adjusted, 0
|
||||
%r = and i1 %null, %underflow
|
||||
ret i1 %r
|
||||
}
|
||||
Loading…
Reference in New Issue