const APInt *SA;
if (match(I->getOperand(1), m_APInt(SA))) {
const APInt *ShrAmt;
- if (match(I->getOperand(0), m_Shr(m_Value(), m_APInt(ShrAmt)))) {
- Instruction *Shr = cast<Instruction>(I->getOperand(0));
- if (Value *R = simplifyShrShlDemandedBits(
- Shr, *ShrAmt, I, *SA, DemandedMask, Known))
- return R;
- }
+ if (match(I->getOperand(0), m_Shr(m_Value(), m_APInt(ShrAmt))))
+ if (Instruction *Shr = dyn_cast<Instruction>(I->getOperand(0)))
+ if (Value *R = simplifyShrShlDemandedBits(Shr, *ShrAmt, I, *SA,
+ DemandedMask, Known))
+ return R;
uint64_t ShiftAmt = SA->getLimitedValue(BitWidth-1);
APInt DemandedMaskIn(DemandedMask.lshr(ShiftAmt));
--- /dev/null
+; RUN: opt -S -instcombine < %s | FileCheck %s
+
+@g_40 = external global i8, align 2
+@g_461 = external global [6 x i8], align 2
+@g_49 = external local_unnamed_addr global { i8, i8, i8, i8, i8 }, align 2
+
+; CHECK-LABEL: @func_24(
+define fastcc void @func_24() {
+entry:
+ %bf.load81 = load i40, i40* bitcast ({ i8, i8, i8, i8, i8 }* @g_49 to i40*), align 2
+ %bf.clear = and i40 %bf.load81, -274869518337
+ %bf.set = or i40 %bf.clear, shl (i40 zext (i1 icmp sgt (i32 zext (i1 icmp eq (i8* getelementptr inbounds ([6 x i8], [6 x i8]* @g_461, i64 0, i64 2), i8* @g_40) to i32), i32 0) to i40), i40 23)
+ %tmp = lshr i40 %bf.set, 23
+ %tmp1 = trunc i40 %tmp to i32
+ %tmp2 = and i32 1, %tmp1
+ %tmp3 = shl nuw nsw i32 %tmp2, 23
+ %bf.shl154 = zext i32 %tmp3 to i40
+ %bf.set156 = or i40 %bf.clear, %bf.shl154
+ unreachable
+}