return new ICmpInst(CmpInst::getInversePredicate(Pred), Op1,
ConstantInt::getNullValue(Op1->getType()));
+ // Canonicalize:
+ // icmp eq/ne X, OneUse(rotate-right(X))
+ // -> icmp eq/ne X, rotate-left(X)
+ // We generally try to convert rotate-right -> rotate-left, this just
+ // canonicalizes another case.
+ CmpInst::Predicate PredUnused = Pred;
+ if (match(&I, m_c_ICmp(PredUnused, m_Value(A),
+ m_OneUse(m_Intrinsic<Intrinsic::fshr>(
+ m_Deferred(A), m_Deferred(A), m_Value(B))))))
+ return new ICmpInst(
+ Pred, A,
+ Builder.CreateIntrinsic(Op0->getType(), Intrinsic::fshl, {A, A, B}));
+
return nullptr;
}
declare void @use.i8(i8)
define i1 @cmpeq_rorr_to_rorl(i8 %x, i8 %C) {
; CHECK-LABEL: @cmpeq_rorr_to_rorl(
-; CHECK-NEXT: [[X_RORR:%.*]] = call i8 @llvm.fshr.i8(i8 [[X:%.*]], i8 [[X]], i8 [[C:%.*]])
-; CHECK-NEXT: [[R:%.*]] = icmp eq i8 [[X_RORR]], [[X]]
+; CHECK-NEXT: [[TMP1:%.*]] = call i8 @llvm.fshl.i8(i8 [[X:%.*]], i8 [[X]], i8 [[C:%.*]])
+; CHECK-NEXT: [[R:%.*]] = icmp eq i8 [[TMP1]], [[X]]
; CHECK-NEXT: ret i1 [[R]]
;
%x_rorr = call i8 @llvm.fshr.i8(i8 %x, i8 %x, i8 %C)
define i1 @cmpne_rorr_rorr(i8 %x, i8 %C0, i8 %C1) {
; CHECK-LABEL: @cmpne_rorr_rorr(
; CHECK-NEXT: [[TMP1:%.*]] = sub i8 [[C0:%.*]], [[C1:%.*]]
-; CHECK-NEXT: [[TMP2:%.*]] = call i8 @llvm.fshr.i8(i8 [[X:%.*]], i8 [[X]], i8 [[TMP1]])
+; CHECK-NEXT: [[TMP2:%.*]] = call i8 @llvm.fshl.i8(i8 [[X:%.*]], i8 [[X]], i8 [[TMP1]])
; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[TMP2]], [[X]]
; CHECK-NEXT: ret i1 [[R]]
;