[llvm] [X86] Resolve FIXME: Add FPCW as a rounding control register (PR #82452)

[via llvm-commits]

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@@ -3443,6 +3443,8 @@ static bool isX87Reg(unsigned Reg) {
 
 /// check if the instruction is X87 instruction
 bool X86::isX87Instruction(MachineInstr &MI) {
+  if (MI.isCall())
+    return false;
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AtariDreams wrote:

> If you'd like to insert wait after call instruction, code should be added in X86InsertWait.cp, instead of `X86::isX87Instruction`.

We add it before a call but not after.

We expect the function being called to have a wait before returning.

https://github.com/llvm/llvm-project/pull/82452