[globalisel] Add support for intrinsic_w_chain.

This maps directly to G_INTRINSIC_W_SIDE_EFFECTS.

llvm-svn: 313627

include/llvm/Target/GlobalISel/SelectionDAGCompat.td

@@ -66,6 +66,7 @@ def : GINodeEquiv<G_FPOW, fpow>;
 def : GINodeEquiv<G_FEXP2, fexp2>;
 def : GINodeEquiv<G_FLOG2, flog2>;
 def : GINodeEquiv<G_INTRINSIC, intrinsic_wo_chain>;
+def : GINodeEquiv<G_INTRINSIC_W_SIDE_EFFECTS, intrinsic_w_chain>;
 def : GINodeEquiv<G_BR, br>;
 
 // Specifies the GlobalISel equivalents for SelectionDAG's ComplexPattern.

test/CodeGen/X86/GlobalISel/select-intrinsic-x86-flags-read-u32.mir

@@ -0,0 +1,27 @@
+# RUN: llc -mtriple=i386-- -run-pass=instruction-select -verify-machineinstrs -global-isel %s -o - | FileCheck %s
+
+--- |
+  define void @read_flags() { ret void }
+...
+
+---
+# Check that we select a the x86.flags.read.u32 intrinsic into a RDFLAGS
+# instruction. Also check that we constrain the register class of the COPY to
+# gr32.
+# CHECK-LABEL: name: read_flags
+name:            read_flags
+legalized:       true
+regBankSelected: true
+
+# CHECK:      registers:
+# CHECK-NEXT:  - { id: 0, class: gr32, preferred-register: '' }
+registers:
+  - { id: 0, class: gpr }
+
+# CHECK:  body:
+# CHECK:    %0 = RDFLAGS32
+body:             |
+  bb.0:
+    %0(s32) = G_INTRINSIC_W_SIDE_EFFECTS intrinsic(@llvm.x86.flags.read.u32)
+    %rax = COPY %0(s32)
+...

utils/TableGen/GlobalISelEmitter.cpp

@@ -2038,9 +2038,11 @@ GlobalISelEmitter::createAndImportSelDAGMatcher(InstructionMatcher &InsnMatcher,
     for (unsigned i = 0, e = Src->getNumChildren(); i != e; ++i) {
       TreePatternNode *SrcChild = Src->getChild(i);
 
-      // For G_INTRINSIC, the operand immediately following the defs is an
-      // intrinsic ID.
-      if (SrcGIOrNull->TheDef->getName() == "G_INTRINSIC" && i == 0) {
+      // For G_INTRINSIC/G_INTRINSIC_W_SIDE_EFFECTS, the operand immediately
+      // following the defs is an intrinsic ID.
+      if ((SrcGIOrNull->TheDef->getName() == "G_INTRINSIC" ||
+           SrcGIOrNull->TheDef->getName() == "G_INTRINSIC_W_SIDE_EFFECTS") &&
+          i == 0) {
         if (const CodeGenIntrinsic *II = Src->getIntrinsicInfo(CGP)) {
           OperandMatcher &OM =
               InsnMatcher.addOperand(OpIdx++, SrcChild->getName(), TempOpIdx);