[PATCH] D130638: [X86][MC] Avoid to emit fake warning for complex FMUL

[Phoebe Wang via Phabricator via llvm-commits]

pengfei created this revision.
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We will insert a new operand which is identical to the Dest for complex
FMUL with a mask. https://godbolt.org/z/eTEdnYv3q

Complex FMA and FMUL with maskz don't have this problem.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130638

Files:
  llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
  llvm/test/MC/X86/avx512fp16.s


Index: llvm/test/MC/X86/avx512fp16.s
===================================================================
--- llvm/test/MC/X86/avx512fp16.s
+++ llvm/test/MC/X86/avx512fp16.s
@@ -1,4 +1,7 @@
 // RUN: llvm-mc -triple x86_64-unknown-unknown --show-encoding < %s  | FileCheck %s
+// RUN: llvm-mc -triple x86_64-unknown-unknown < %s 2>&1 | FileCheck %s --check-prefix=CHECK-NO-WARN
+
+// CHECK-NO-WARN-NOT: warning
 
 // CHECK: vmovsh %xmm28, %xmm29, %xmm30
 // CHECK: encoding: [0x62,0x05,0x16,0x00,0x10,0xf4]
Index: llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
===================================================================
--- llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -3847,7 +3847,10 @@
   } else if (isVFCMULCPH(Opcode) || isVFCMULCSH(Opcode) || isVFMULCPH(Opcode) ||
              isVFMULCSH(Opcode)) {
     unsigned Dest = Inst.getOperand(0).getReg();
-    for (unsigned i = 1; i < Inst.getNumOperands(); i++)
+    unsigned i = 1;
+    if ((TSFlags & (X86II::EVEX_K | X86II::EVEX_Z)) == X86II::EVEX_K)
+      ++i;
+    for (; i < Inst.getNumOperands(); i++)
       if (Inst.getOperand(i).isReg() && Dest == Inst.getOperand(i).getReg())
         return Warning(Ops[0]->getStartLoc(), "Destination register should be "
                                               "distinct from source registers");


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