06f3ef6626
With this patch pre-conditions can be added to a list of constraints. Constraints with pre-conditions can only be used if all pre-conditions are satisfied when the constraint is used. The pre-conditions at the moment are specified as a list of (Predicate, Value *,Value *) tuples. This allow easily checking them like any other condition, using the existing infrastructure. This then is used to limit GEP decomposition to cases where we can prove that offsets are signed positive. This fixes a couple of incorrect transforms where GEP offsets where assumed to be signed positive, but they were not. Note that this effectively disables GEP decomposition, as there's no support for reasoning about signed predicates. D118806 adds initial signed support. Fixes PR49624. Reviewed By: reames Differential Revision: https://reviews.llvm.org/D118799
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 -passes=constraint-elimination -S %s | FileCheck %s
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; The system for the function below grows quite large. Check to make sure
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; we can handle that scenario.
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define void @test(i64 %x, i8* %y, i8* %z, i8* %w) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: [[TMP22:%.*]] = getelementptr inbounds i8, i8* [[Y:%.*]], i64 [[X:%.*]]
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; CHECK-NEXT: [[TMP26:%.*]] = icmp ult i8* [[TMP22]], [[Z:%.*]]
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; CHECK-NEXT: br i1 [[TMP26]], label [[BB28:%.*]], label [[EARLY_EXIT:%.*]]
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; CHECK: early.exit:
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; CHECK-NEXT: unreachable
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; CHECK: bb28:
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; CHECK-NEXT: [[TMP29:%.*]] = getelementptr inbounds i8, i8* [[Y]], i64 [[X]]
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; CHECK-NEXT: [[TMP30:%.*]] = icmp ult i8* [[TMP29]], [[Z]]
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; CHECK-NEXT: br i1 [[TMP30]], label [[EARLY_EXIT]], label [[BB32:%.*]]
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; CHECK: bb32:
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; CHECK-NEXT: [[TMP33:%.*]] = icmp ult i8* [[TMP29]], [[Z]]
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; CHECK-NEXT: br i1 [[TMP33]], label [[BB35:%.*]], label [[EARLY_EXIT]]
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; CHECK: bb35:
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; CHECK-NEXT: [[TMP36:%.*]] = icmp ult i8* [[Y]], [[Z]]
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; CHECK-NEXT: br i1 [[TMP36]], label [[EARLY_EXIT]], label [[BB38:%.*]]
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; CHECK: bb38:
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; CHECK-NEXT: [[TMP41:%.*]] = icmp ult i8* [[Y]], [[Z]]
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; CHECK-NEXT: br i1 false, label [[EARLY_EXIT]], label [[BB43:%.*]]
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; CHECK: bb43:
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; CHECK-NEXT: [[TMP47:%.*]] = getelementptr inbounds i8, i8* [[W:%.*]], i64 [[X]]
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; CHECK-NEXT: [[TMP48:%.*]] = icmp ult i8* [[TMP47]], [[Y]]
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; CHECK-NEXT: br i1 [[TMP48]], label [[EARLY_EXIT]], label [[BB50:%.*]]
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; CHECK: bb50:
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; CHECK-NEXT: [[TMP52:%.*]] = getelementptr inbounds i8, i8* [[W]], i64 [[X]]
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; CHECK-NEXT: [[TMP53:%.*]] = icmp ult i8* [[TMP52]], [[Y]]
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; CHECK-NEXT: br i1 [[TMP53]], label [[EARLY_EXIT]], label [[BB55:%.*]]
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; CHECK: bb55:
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; CHECK-NEXT: [[TMP57:%.*]] = icmp ult i8* [[W]], [[Y]]
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; CHECK-NEXT: br i1 [[TMP57]], label [[BB59:%.*]], label [[EARLY_EXIT]]
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; CHECK: bb59:
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; CHECK-NEXT: [[TMP60:%.*]] = icmp ult i8* [[W]], [[Y]]
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; CHECK-NEXT: call void @use(i1 true)
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; CHECK-NEXT: ret void
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;
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%tmp22 = getelementptr inbounds i8, i8* %y, i64 %x
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%tmp26 = icmp ult i8* %tmp22, %z
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br i1 %tmp26, label %bb28, label %early.exit
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early.exit:
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unreachable
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bb28:
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%tmp29 = getelementptr inbounds i8, i8* %y, i64 %x
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%tmp30 = icmp ult i8* %tmp29, %z
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br i1 %tmp30, label %early.exit, label %bb32
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bb32:
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%tmp33 = icmp ult i8* %tmp29, %z
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br i1 %tmp33, label %bb35, label %early.exit
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bb35:
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%tmp36 = icmp ult i8* %y, %z
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br i1 %tmp36, label %early.exit, label %bb38
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bb38:
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%tmp41 = icmp ult i8* %y, %z
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br i1 %tmp41, label %early.exit, label %bb43
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bb43:
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%tmp47 = getelementptr inbounds i8, i8* %w, i64 %x
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%tmp48 = icmp ult i8* %tmp47, %y
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br i1 %tmp48, label %early.exit, label %bb50
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bb50:
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%tmp52 = getelementptr inbounds i8, i8* %w, i64 %x
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%tmp53 = icmp ult i8* %tmp52, %y
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br i1 %tmp53, label %early.exit, label %bb55
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bb55:
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%tmp57 = icmp ult i8* %w, %y
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br i1 %tmp57, label %bb59, label %early.exit
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bb59:
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%tmp60 = icmp ult i8* %w, %y
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call void @use(i1 %tmp60)
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ret void
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}
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declare void @use(i1)
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