unsigned MSB = BitWidth - Imm.countLeadingZeros() - 1;
unsigned NewBW = NextPowerOf2(MSB - ShAmt);
EVT NewVT = EVT::getIntegerVT(*DAG.getContext(), NewBW);
+ // The narowwing should be profitable, the load/store operation should be
+ // legal (or custom) and the store size should be equal to the NewVT width.
while (NewBW < BitWidth &&
- !(TLI.isOperationLegalOrCustom(Opc, NewVT) &&
- TLI.isNarrowingProfitable(VT, NewVT))) {
+ (NewVT.getStoreSizeInBits() != NewBW ||
+ !TLI.isOperationLegalOrCustom(Opc, NewVT) ||
+ !TLI.isNarrowingProfitable(VT, NewVT))) {
NewBW = NextPowerOf2(NewBW);
NewVT = EVT::getIntegerVT(*DAG.getContext(), NewBW);
}
--- /dev/null
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=knl | FileCheck %s
+
+; CHECK-LABEL: @foo
+; CHECK: orb $16
+define void @foo(i64* %ptr) {
+ %r11 = load i64* %ptr, align 8
+ %r12 = or i64 16, %r11
+ store i64 %r12, i64* %ptr, align 8
+ ret void
+}