unsigned PowerOfTwo = 0;
SDValue NewMulConst;
if (canExtractShiftFromMul(Offset, 31, PowerOfTwo, NewMulConst)) {
+ HandleSDNode Handle(Offset);
replaceDAGValue(Offset.getOperand(1), NewMulConst);
+ Offset = Handle.getValue();
ShAmt = PowerOfTwo;
ShOpcVal = ARM_AM::lsl;
}
unsigned PowerOfTwo = 0;
SDValue NewMulConst;
if (canExtractShiftFromMul(OffReg, 3, PowerOfTwo, NewMulConst)) {
+ HandleSDNode Handle(OffReg);
replaceDAGValue(OffReg.getOperand(1), NewMulConst);
+ OffReg = Handle.getValue();
ShAmt = PowerOfTwo;
}
}
--- /dev/null
+; RUN: llc -mtriple=arm %s -o - | FileCheck %s
+; RUN: llc -mtriple=thumbv7 %s -o - | FileCheck %s
+
+; We ended up feeding a deleted node back to TableGen when we converted "Off *
+; 410" into "(Off * 205) << 1", where the multiplication already existed in the
+; DAG.
+
+; CHECK-LABEL: addrmode_cse_mutation:
+; CHECK: {{mul|muls}} [[OFFSET:r[0-9]+]], {{r[0-9]+}}, {{r[0-9]+}}
+; CHECK: {{ldrb|ldrb.w}} {{r[0-9]+}}, [r0, [[OFFSET]], lsl #3]
+define i32 @addrmode_cse_mutation(i8* %base, i32 %count) {
+ %offset = mul i32 %count, 277288
+ %ptr = getelementptr i8, i8* %base, i32 %offset
+ %val = load volatile i8, i8* %ptr
+ %res = mul i32 %count, 34661
+ ret i32 %res
+}