[all-commits] [llvm/llvm-project] 40e86c: [PowerPC] Clean-up mayRaiseFPException bits

[Qiu Chaofan via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 40e86ca749a7c38875858d1005f34d1e2f53743b
      https://github.com/llvm/llvm-project/commit/40e86ca749a7c38875858d1005f34d1e2f53743b
  Author: Qiu Chaofan <qiucofan at cn.ibm.com>
  Date:   2020-09-28 (Mon, 28 Sep 2020)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCInstrInfo.td
    M llvm/lib/Target/PowerPC/PPCInstrVSX.td
    M llvm/test/CodeGen/PowerPC/nofpexcept.ll

  Log Message:
  -----------
  [PowerPC] Clean-up mayRaiseFPException bits

According to POWER ISA, floating point instructions altering exception
bits in FPSCR should be 'may raise FP exception'. (excluding those
read or write the whole FPSCR directly, like mffs/mtfsf) We need to
model FPSCR well in future patches to handle the special case properly.

Instructions added mayRaiseFPException:
- fre(s)/frsqrte(s)
- fmadd(s)/fmsub(s)/fnmadd(s)/fnmsub(s)
- xscmpoqp/xscmpuqp/xscmpeqdp/xscmpgedp/xscmpgtdp
- xscvdphp/xscvhpdp/xvcvhpsp/xvcvsphp/xsrqpxp
- xsmaxcdp/xsincdp/xsmaxjdp/xsminjdp

Instructions removed mayRaiseFPException:
- xstdivdp/xvtdiv(d|s)p/xstsqrtdp/xvtsqrt(d|s)p
- xsabsdp/xsnabsdp/xvabs(d|s)p/xvnabs(d|s)p
- xsnegdp/xscpsgndp/xvneg(d|s)p/xvcpsgn(d|s)p
- xvcvsxwdp/xvcvuxwdp
- xscvdpspn/xscvspdpn

Reviewed By: steven.zhang

Differential Revision: https://reviews.llvm.org/D87738