forked from OSchip/llvm-project
[NFC][InstCombine][InstSimplify] PR43251 - and some patterns with offset != 0
https://rise4fun.com/Alive/21b llvm-svn: 371537
This commit is contained in:
Roman Lebedev
parent
da027275c6
commit
880657c97c
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@ -11,6 +11,8 @@ 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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declare void @llvm.assume(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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@ -371,7 +373,7 @@ define i1 @t12(i8 %base, i8 %offset) {
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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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%underflow = icmp ult i8 %base, %offset
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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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@ -421,3 +423,57 @@ define i1 @t13(i8 %base, i8 %offset) {
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%r = and i1 %null, %underflow
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ret i1 %r
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}
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;-------------------------------------------------------------------------------
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define i1 @t15(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t15(
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i8 [[OFFSET:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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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 ult i8 [[ADJUSTED]], [[BASE]]
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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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%cmp = icmp ne i8 %offset, 0
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call void @llvm.assume(i1 %cmp)
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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 ult 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 @t20(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t20(
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i8 [[OFFSET:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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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 [[ADJUSTED]], [[BASE]]
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; CHECK-NEXT: call void @use1(i1 [[NO_UNDERFLOW]])
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp eq 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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%cmp = icmp ne i8 %offset, 0
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call void @llvm.assume(i1 %cmp)
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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 %adjusted, %base
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call void @use1(i1 %no_underflow)
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%not_null = icmp eq 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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@ -0,0 +1,84 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt %s -instsimplify -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 @llvm.assume(i1)
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define i1 @t0(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t0(
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i8 [[OFFSET:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET]]
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[ADJUSTED]], [[BASE]]
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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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%cmp = icmp ne i8 %offset, 0
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call void @llvm.assume(i1 %cmp)
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%adjusted = sub i8 %base, %offset
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%no_underflow = icmp uge i8 %adjusted, %base
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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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define i1 @t1(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t1(
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i8 [[OFFSET:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET]]
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i8 [[ADJUSTED]], [[BASE]]
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp eq 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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%cmp = icmp ne i8 %offset, 0
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call void @llvm.assume(i1 %cmp)
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%adjusted = sub i8 %base, %offset
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%no_underflow = icmp ult i8 %adjusted, %base
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%not_null = icmp eq 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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define i1 @t2_commutative(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t2_commutative(
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i8 [[OFFSET:%.*]], 0
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; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET]]
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i8 [[BASE]], [[ADJUSTED]]
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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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%cmp = icmp ne i8 %offset, 0
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call void @llvm.assume(i1 %cmp)
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%adjusted = sub i8 %base, %offset
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%no_underflow = icmp ule i8 %base, %adjusted
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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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; We don't know that offset is non-zero, so we can't fold.
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define i1 @t3_bad(i8 %base, i8 %offset) {
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; CHECK-LABEL: @t3_bad(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i8 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i8 [[ADJUSTED]], [[BASE]]
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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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%adjusted = sub i8 %base, %offset
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%no_underflow = icmp uge i8 %adjusted, %base
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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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