[Legalizer] Use correct ValueType of SELECT_CC node during Float promotion

[pirama]

Summary

When legalizing the result of a SELECT_CC node by promoting the
floating-point type, use the promoted-to type rather than the original
type.

Fix PR40273.

[efriedma]

LGTM

lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp

 }
 
 // Construct a new SELECT_CC node with the promoted true- and false- values.
 // The operands used for comparison are promoted by PromoteFloatOp_SELECT_CC.
 SDValue DAGTypeLegalizer::PromoteFloatRes_SELECT_CC(SDNode *N) {
   SDValue TrueVal = GetPromotedFloat(N->getOperand(2));
   SDValue FalseVal = GetPromotedFloat(N->getOperand(3));
 
-  return DAG.getNode(ISD::SELECT_CC, SDLoc(N), N->getValueType(0),
-                     N->getOperand(0), N->getOperand(1), TrueVal, FalseVal,
-                     N->getOperand(4));
+  return DAG.getNode(ISD::SELECT_CC, SDLoc(N),
+                     TrueVal.getNode()->getValueType(0), N->getOperand(0),
+                     N->getOperand(1), TrueVal, FalseVal, N->getOperand(4));
 }
 
 // Construct a SDNode that transforms the SINT or UINT operand to the promoted
 // float type.
 SDValue DAGTypeLegalizer::PromoteFloatRes_XINT_TO_FP(SDNode *N) {
   SDLoc DL(N);
   EVT VT = N->getValueType(0);
   EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);

test/CodeGen/X86/half.ll

 ; CHECK-I686-NEXT:    retl
   %tmp0 = load half, half* %b
   %tmp1 = sitofp i32 %a to half
   %tmp2 = fadd half %tmp0, %tmp1
   %tmp3 = fpext half %tmp2 to float
   ret float %tmp3
 }
 
+define half @PR40273(half) #0 {
+; CHECK-LIBCALL-LABEL: PR40273:
+; CHECK-LIBCALL:       # %bb.0:
+; CHECK-LIBCALL-NEXT:    pushq %rax
+; CHECK-LIBCALL-NEXT:    callq __gnu_f2h_ieee
+; CHECK-LIBCALL-NEXT:    movzwl %ax, %edi
+; CHECK-LIBCALL-NEXT:    callq __gnu_h2f_ieee
+; CHECK-LIBCALL-NEXT:    xorps %xmm1, %xmm1
+; CHECK-LIBCALL-NEXT:    ucomiss %xmm1, %xmm0
+; CHECK-LIBCALL-NEXT:    movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; CHECK-LIBCALL-NEXT:    jne .LBB17_3
+; CHECK-LIBCALL-NEXT:  # %bb.1:
+; CHECK-LIBCALL-NEXT:    jp .LBB17_3
+; CHECK-LIBCALL-NEXT:  # %bb.2:
+; CHECK-LIBCALL-NEXT:    xorps %xmm0, %xmm0
+; CHECK-LIBCALL-NEXT:  .LBB17_3:
+; CHECK-LIBCALL-NEXT:    popq %rax
+; CHECK-LIBCALL-NEXT:    retq
+;
+; BWON-F16C-LABEL: PR40273:
+; BWON-F16C:       # %bb.0:
+; BWON-F16C-NEXT:    vcvtps2ph $4, %xmm0, %xmm0
+; BWON-F16C-NEXT:    vcvtph2ps %xmm0, %xmm0
+; BWON-F16C-NEXT:    vxorps %xmm1, %xmm1, %xmm1
+; BWON-F16C-NEXT:    vucomiss %xmm1, %xmm0
+; BWON-F16C-NEXT:    vmovss {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; BWON-F16C-NEXT:    jne .LBB17_3
+; BWON-F16C-NEXT:  # %bb.1:
+; BWON-F16C-NEXT:    jp .LBB17_3
+; BWON-F16C-NEXT:  # %bb.2:
+; BWON-F16C-NEXT:    vxorps %xmm0, %xmm0, %xmm0
+; BWON-F16C-NEXT:  .LBB17_3:
+; BWON-F16C-NEXT:    retq
+;
+; CHECK-I686-LABEL: PR40273:
+; CHECK-I686:       # %bb.0:
+; CHECK-I686-NEXT:    subl $12, %esp
+; CHECK-I686-NEXT:    movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; CHECK-I686-NEXT:    movss %xmm0, (%esp)
+; CHECK-I686-NEXT:    calll __gnu_f2h_ieee
+; CHECK-I686-NEXT:    movzwl %ax, %eax
+; CHECK-I686-NEXT:    movl %eax, (%esp)
+; CHECK-I686-NEXT:    calll __gnu_h2f_ieee
+; CHECK-I686-NEXT:    fstps {{[0-9]+}}(%esp)
+; CHECK-I686-NEXT:    movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; CHECK-I686-NEXT:    xorps %xmm1, %xmm1
+; CHECK-I686-NEXT:    ucomiss %xmm1, %xmm0
+; CHECK-I686-NEXT:    movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; CHECK-I686-NEXT:    jne .LBB17_3
+; CHECK-I686-NEXT:  # %bb.1:
+; CHECK-I686-NEXT:    jp .LBB17_3
+; CHECK-I686-NEXT:  # %bb.2:
+; CHECK-I686-NEXT:    xorps %xmm0, %xmm0
+; CHECK-I686-NEXT:  .LBB17_3:
+; CHECK-I686-NEXT:    movss %xmm0, {{[0-9]+}}(%esp)
+; CHECK-I686-NEXT:    flds {{[0-9]+}}(%esp)
+; CHECK-I686-NEXT:    addl $12, %esp
+; CHECK-I686-NEXT:    retl
+  %2 = fcmp une half %0, 0xH0000
+  %3 = uitofp i1 %2 to half
+  ret half %3
+}
+
 attributes #0 = { nounwind }