[llvm] [ARM] Mark function calls as possibly changing FPSCR (PR #160699)

[Simon Tatham via llvm-commits]

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@@ -22003,6 +22003,11 @@ bool ARMTargetLowering::isComplexDeinterleavingOperationSupported(
           ScalarTy->isIntegerTy(32));
 }
 
+ArrayRef<MCPhysReg> ARMTargetLowering::getRoundingControlRegisters() const {
+  static const MCPhysReg RCRegs[] = {ARM::FPSCR};
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statham-arm wrote:

I don't quite understand why this is specified as the full FPSCR, when your other PR #160698 introduced FPSCR_RM which is specifically the rounding mode control bits?

https://github.com/llvm/llvm-project/pull/160699