[llvm] [GlobalISel] Add support for value/constants as inline asm memory operand (PR #161501)

[Pierre van Houtryve via llvm-commits]

================
@@ -454,26 +455,52 @@ bool InlineAsmLowering::lowerInlineAsm(
       }
 
       if (OpInfo.ConstraintType == TargetLowering::C_Memory) {
-
-        if (!OpInfo.isIndirect) {
-          LLVM_DEBUG(dbgs()
-                     << "Cannot indirectify memory input operands yet\n");
-          return false;
-        }
-
-        assert(OpInfo.isIndirect && "Operand must be indirect to be a mem!");
-
         const InlineAsm::ConstraintCode ConstraintID =
             TLI->getInlineAsmMemConstraint(OpInfo.ConstraintCode);
         InlineAsm::Flag OpFlags(InlineAsm::Kind::Mem, 1);
         OpFlags.setMemConstraint(ConstraintID);
         Inst.addImm(OpFlags);
+
+        if (OpInfo.isIndirect) {
+          // already indirect
+          ArrayRef<Register> SourceRegs =
+              GetOrCreateVRegs(*OpInfo.CallOperandVal);
+          if (SourceRegs.size() != 1) {
+            LLVM_DEBUG(dbgs() << "Expected the memory input to fit into a "
+                                 "single virtual register "
+                                 "for constraint '"
+                              << OpInfo.ConstraintCode << "'\n");
+            return false;
+          }
+          Inst.addReg(SourceRegs[0]);
+          break;
+        }
+
+        // Needs to be made indirect. Store the value on the stack and use
+        // a pointer to it.
+        Value *OpVal = OpInfo.CallOperandVal;
+        unsigned Bytes = DL.getTypeStoreSize(OpVal->getType());
----------------
Pierre-vh wrote:

https://github.com/llvm/llvm-project/commit/853ed3b3b7d891d4fc6b140ded9326381047cb7c

https://github.com/llvm/llvm-project/pull/161501