Revert "[PowerPC] support register pressure reduction in machine comb…

…iner." This reverts commit 26a396c. See https://reviews.llvm.org/D92071 for a description of the issue.
llvm · Jan 18, 2021 · 3bd2457 · 3bd2457
1 parent aca240b
commit 3bd2457
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Showing 5 changed files with 45 additions and 621 deletions.
diff --git a/llvm/include/llvm/CodeGen/MachineCombinerPattern.h b/llvm/include/llvm/CodeGen/MachineCombinerPattern.h
@@ -29,11 +29,6 @@ enum class MachineCombinerPattern {
   REASSOC_XY_AMM_BMM,
   REASSOC_XMM_AMM_BMM,
 
-  // These are patterns matched by the PowerPC to reassociate FMA and FSUB to
-  // reduce register pressure.
-  REASSOC_XY_BCA,
-  REASSOC_XY_BAC,
-
   // These are multiply-add patterns matched by the AArch64 machine combiner.
   MULADDW_OP1,
   MULADDW_OP2,

diff --git a/llvm/lib/CodeGen/MachineCombiner.cpp b/llvm/lib/CodeGen/MachineCombiner.cpp
@@ -279,9 +279,6 @@ static CombinerObjective getCombinerObjective(MachineCombinerPattern P) {
   case MachineCombinerPattern::REASSOC_XY_AMM_BMM:
   case MachineCombinerPattern::REASSOC_XMM_AMM_BMM:
     return CombinerObjective::MustReduceDepth;
-  case MachineCombinerPattern::REASSOC_XY_BCA:
-  case MachineCombinerPattern::REASSOC_XY_BAC:
-    return CombinerObjective::MustReduceRegisterPressure;
   default:
     return CombinerObjective::Default;
   }