}
}
}
+
+ // 0 / x -> 0.
+ if ((Opcode == Instruction::UDiv ||
+ Opcode == Instruction::SDiv) &&
+ CI1->isZero())
+ return const_cast<Constant*>(C1);
+
} else if (const ConstantFP *CFP1 = dyn_cast<ConstantFP>(C1)) {
if (const ConstantFP *CFP2 = dyn_cast<ConstantFP>(C2)) {
APFloat C1V = CFP1->getValueAPF();
--- /dev/null
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {ret i32 0}
+; PR4424
+declare void @ext()
+
+define i32 @foo(i32 %ptr) {
+entry:
+ %zero = sub i32 %ptr, %ptr ; <i32> [#uses=1]
+ %div_zero = sdiv i32 %zero, ptrtoint (i32* getelementptr (i32* null,
+i32 1) to i32) ; <i32> [#uses=1]
+ ret i32 %div_zero
+}
+