Simple check to ignore Inline asm fwait insertion (#101686)

Just a simple check to ignore Inline asm fwait insertion

Fixes #101613

Author: Temperature-block

llvm/lib/Target/X86/X86InstrInfo.cpp

@@ -3591,10 +3591,10 @@ static bool isX87Reg(unsigned Reg) {
 
 /// check if the instruction is X87 instruction
 bool X86::isX87Instruction(MachineInstr &MI) {
-  // Call defs X87 register, so we special case it here because
+  // Call and inlineasm defs X87 register, so we special case it here because
   // otherwise calls are incorrectly flagged as x87 instructions
   // as a result.
-  if (MI.isCall())
+  if (MI.isCall() || MI.isInlineAsm())
     return false;
   for (const MachineOperand &MO : MI.operands()) {
     if (!MO.isReg())

llvm/test/CodeGen/X86/pr59305.ll

@@ -81,20 +81,17 @@ define double @bar(double %0) #0 {
 ; X64-NEXT:    #APP
 ; X64-NEXT:    ldmxcsr 0
 ; X64-NEXT:    #NO_APP
-; X64-NEXT:    wait
 ; X64-NEXT:    movsd {{.*#+}} xmm2 = [1.0E+0,0.0E+0]
 ; X64-NEXT:    movapd %xmm2, %xmm3
 ; X64-NEXT:    divsd %xmm0, %xmm3
 ; X64-NEXT:    #APP
 ; X64-NEXT:    ldmxcsr 0
 ; X64-NEXT:    #NO_APP
-; X64-NEXT:    wait
 ; X64-NEXT:    movapd %xmm2, %xmm1
 ; X64-NEXT:    divsd %xmm0, %xmm1
 ; X64-NEXT:    #APP
 ; X64-NEXT:    ldmxcsr 0
 ; X64-NEXT:    #NO_APP
-; X64-NEXT:    wait
 ; X64-NEXT:    divsd %xmm0, %xmm2
 ; X64-NEXT:    movapd %xmm3, %xmm0
 ; X64-NEXT:    callq fma@PLT
@@ -105,6 +102,7 @@ define double @bar(double %0) #0 {
 ; X86:       # %bb.0:
 ; X86-NEXT:    subl $28, %esp
 ; X86-NEXT:    fldl {{[0-9]+}}(%esp)
+; X86-NEXT:    wait
 ; X86-NEXT:    #APP
 ; X86-NEXT:    fldcw 0
 ; X86-NEXT:    #NO_APP