LC = RTLIB::MUL_I128;
assert(LC != RTLIB::UNKNOWN_LIBCALL && "Cannot expand this operation!");
- // The high part is obtained by SRA'ing all but one of the bits of low
- // part.
- unsigned LoSize = VT.getSizeInBits();
- SDValue HiLHS =
- DAG.getNode(ISD::SRA, dl, VT, LHS,
- DAG.getConstant(LoSize - 1, dl,
- TLI.getPointerTy(DAG.getDataLayout())));
- SDValue HiRHS =
- DAG.getNode(ISD::SRA, dl, VT, RHS,
- DAG.getConstant(LoSize - 1, dl,
- TLI.getPointerTy(DAG.getDataLayout())));
+ SDValue HiLHS;
+ SDValue HiRHS;
+ if (isSigned) {
+ // The high part is obtained by SRA'ing all but one of the bits of low
+ // part.
+ unsigned LoSize = VT.getSizeInBits();
+ HiLHS =
+ DAG.getNode(ISD::SRA, dl, VT, LHS,
+ DAG.getConstant(LoSize - 1, dl,
+ TLI.getPointerTy(DAG.getDataLayout())));
+ HiRHS =
+ DAG.getNode(ISD::SRA, dl, VT, RHS,
+ DAG.getConstant(LoSize - 1, dl,
+ TLI.getPointerTy(DAG.getDataLayout())));
+ } else {
+ HiLHS = DAG.getConstant(0, dl, VT);
+ HiRHS = DAG.getConstant(0, dl, VT);
+ }
// Here we're passing the 2 arguments explicitly as 4 arguments that are
// pre-lowered to the correct types. This all depends upon WideVT not
--- /dev/null
+; RUN: llc < %s -mtriple=thumbv6m-none-eabi | FileCheck %s
+
+define i1 @unsigned_multiplication_did_overflow(i32, i32) {
+; CHECK-LABEL: unsigned_multiplication_did_overflow:
+entry-block:
+ %2 = tail call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %0, i32 %1)
+ %3 = extractvalue { i32, i1 } %2, 1
+ ret i1 %3
+
+; CHECK: mov{{s?}} r2, r1
+; CHECK: mov{{s?}} r1, #0
+; CHECK: mov{{s?}} r3, {{#0|r1}}
+; CHECK: bl __aeabi_lmul
+}
+
+declare { i32, i1 } @llvm.umul.with.overflow.i32(i32, i32)