}
}
- if ((IsSigned && match(LHS, m_NSWShl(m_Value(X), m_APInt(C1)))) ||
+ if ((IsSigned && match(LHS, m_NSWShl(m_Value(X), m_APInt(C1))) &&
+ *C1 != C1->getBitWidth() - 1) ||
(!IsSigned && match(LHS, m_NUWShl(m_Value(X), m_APInt(C1))))) {
APInt Quotient(C1->getBitWidth(), /*Val=*/0ULL, IsSigned);
APInt C1Shifted = APInt::getOneBitSet(
; CHECK-NEXT: %div = mul nuw i32 %a, 12
; CHECK-NEXT: ret i32 %div
}
+
+define i32 @test29(i32 %a) {
+ %mul = shl nsw i32 %a, 31
+ %div = sdiv i32 %mul, -2147483648
+ ret i32 %div
+; CHECK-LABEL: @test29(
+; CHECK-NEXT: %[[and:.*]] = and i32 %a, 1
+; CHECK-NEXT: ret i32 %[[and]]
+}
+
+define i32 @test30(i32 %a) {
+ %mul = shl nuw i32 %a, 31
+ %div = udiv i32 %mul, -2147483648
+ ret i32 %div
+; CHECK-LABEL: @test30(
+; CHECK-NEXT: ret i32 %a
+}