derek.holloway
7502bf64a4
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87 lines
3.1 KiB
LLVM
87 lines
3.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt %s -passes=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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define i1 @t0(i64 %base, ptr nonnull %offsetptr) {
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; CHECK-LABEL: @t0(
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; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i64 [[ADJUSTED]], [[BASE]]
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; CHECK-NEXT: ret i1 [[NO_UNDERFLOW]]
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;
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%offset = ptrtoint ptr %offsetptr to i64
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%adjusted = sub i64 %base, %offset
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%no_underflow = icmp uge i64 %adjusted, %base
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%not_null = icmp ne i64 %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(i64 %base, ptr nonnull %offsetptr) {
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; CHECK-LABEL: @t1(
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; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ult i64 [[ADJUSTED]], [[BASE]]
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; CHECK-NEXT: ret i1 [[NO_UNDERFLOW]]
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;
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%offset = ptrtoint ptr %offsetptr to i64
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%adjusted = sub i64 %base, %offset
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%no_underflow = icmp ult i64 %adjusted, %base
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%not_null = icmp eq i64 %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(i64 %base, ptr nonnull %offsetptr) {
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; CHECK-LABEL: @t2_commutative(
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; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ule i64 [[BASE]], [[ADJUSTED]]
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; CHECK-NEXT: ret i1 [[NO_UNDERFLOW]]
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;
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%offset = ptrtoint ptr %offsetptr to i64
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%adjusted = sub i64 %base, %offset
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%no_underflow = icmp ule i64 %base, %adjusted
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%not_null = icmp ne i64 %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 @t3_commutative(i64 %base, ptr nonnull %offsetptr) {
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; CHECK-LABEL: @t3_commutative(
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; CHECK-NEXT: [[OFFSET:%.*]] = ptrtoint ptr [[OFFSETPTR:%.*]] to i64
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET]]
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp ugt i64 [[BASE]], [[ADJUSTED]]
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; CHECK-NEXT: ret i1 [[NO_UNDERFLOW]]
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;
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%offset = ptrtoint ptr %offsetptr to i64
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%adjusted = sub i64 %base, %offset
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%no_underflow = icmp ugt i64 %base, %adjusted
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%not_null = icmp eq i64 %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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; We don't know that offset is non-zero, so we can't fold.
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define i1 @t4_bad(i64 %base, i64 %offset) {
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; CHECK-LABEL: @t4_bad(
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; CHECK-NEXT: [[ADJUSTED:%.*]] = sub i64 [[BASE:%.*]], [[OFFSET:%.*]]
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; CHECK-NEXT: [[NO_UNDERFLOW:%.*]] = icmp uge i64 [[ADJUSTED]], [[BASE]]
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; CHECK-NEXT: [[NOT_NULL:%.*]] = icmp ne i64 [[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 i64 %base, %offset
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%no_underflow = icmp uge i64 %adjusted, %base
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%not_null = icmp ne i64 %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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