[llvm] Add m_SelectCCLike matcher to match SELECT_CC or SELECT with SETCC (PR #149646)

[Simon Pilgrim via llvm-commits]

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@@ -4099,18 +4113,7 @@ SDValue DAGCombiner::visitSUB(SDNode *N) {
   // (sub x, ([v]select (uge x, y), y, 0)) -> (umin x, (sub x, y))
   if (N1.hasOneUse() && hasUMin(VT)) {
     SDValue Y;
-    if (sd_match(N1, m_Select(m_SetCC(m_Specific(N0), m_Value(Y),
-                                      m_SpecificCondCode(ISD::SETULT)),
-                              m_Zero(), m_Deferred(Y))) ||
-        sd_match(N1, m_Select(m_SetCC(m_Specific(N0), m_Value(Y),
-                                      m_SpecificCondCode(ISD::SETUGE)),
-                              m_Deferred(Y), m_Zero())) ||
-        sd_match(N1, m_VSelect(m_SetCC(m_Specific(N0), m_Value(Y),
-                                       m_SpecificCondCode(ISD::SETULT)),
-                               m_Zero(), m_Deferred(Y))) ||
-        sd_match(N1, m_VSelect(m_SetCC(m_Specific(N0), m_Value(Y),
-                                       m_SpecificCondCode(ISD::SETUGE)),
-                               m_Deferred(Y), m_Zero())))
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RKSimon wrote:

Can you remove matchUMinSubSelect and revert this back to using m_Select/m_VSelect? I'm hoping that once #150019 lands m_SelectCCLike can support m_VSelect as well.

https://github.com/llvm/llvm-project/pull/149646