From: Luke Kenneth Casson Leighton Date: Mon, 18 Jul 2022 20:47:08 +0000 (+0100) Subject: move D-Immediate rewriting in ISACaller into separate function X-Git-Tag: sv_maxu_works-initial~239 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cca75a0619c9d6a8fb657608fbaf29e3dbdd6a91;p=openpower-isa.git move D-Immediate rewriting in ISACaller into separate function --- diff --git a/src/openpower/decoder/isa/caller.py b/src/openpower/decoder/isa/caller.py index 4b9f1a59..251a4b28 100644 --- a/src/openpower/decoder/isa/caller.py +++ b/src/openpower/decoder/isa/caller.py @@ -1347,71 +1347,8 @@ class ISACaller(ISACallerHelper, ISAFPHelpers): # in SVP64 mode for LD/ST work out immediate # XXX TODO: replace_ds for DS-Form rather than D-Form. # use info.form to detect - replace_d = False # update / replace constant in pseudocode if self.is_svp64_mode: - ldstmode = yield self.dec2.rm_dec.ldstmode - # shift mode reads SVD (or SVDS - TODO) - # *BUT*... because this is "overloading" of LD operations, - # it gets *STORED* into D (or DS, TODO) - if ldstmode == SVP64LDSTmode.SHIFT.value: - imm = yield self.dec2.dec.fields.FormSVD.SVD[0:11] - imm = exts(imm, 11) # sign-extend to integer - log("shift SVD", imm) - replace_d = True - else: - if info.form == 'DS': - # DS-Form, multiply by 4 then knock 2 bits off after - imm = yield self.dec2.dec.fields.FormDS.DS[0:14] * 4 - else: - imm = yield self.dec2.dec.fields.FormD.D[0:16] - imm = exts(imm, 16) # sign-extend to integer - # get the right step. LD is from srcstep, ST is dststep - op = yield self.dec2.e.do.insn_type - offsmul = 0 - if op == MicrOp.OP_LOAD.value: - if remap_active: - offsmul = yield self.dec2.in1_step - log("D-field REMAP src", imm, offsmul) - else: - offsmul = (srcstep * (subvl+1)) + substep - log("D-field src", imm, offsmul) - elif op == MicrOp.OP_STORE.value: - # XXX NOTE! no bit-reversed STORE! this should not ever be used - offsmul = (dststep * (subvl+1)) + substep - log("D-field dst", imm, offsmul) - # bit-reverse mode, rev already done through get_src_dst_steps() - if ldstmode == SVP64LDSTmode.SHIFT.value: - # manually look up RC, sigh - RC = yield self.dec2.dec.RC[0:5] - RC = self.gpr(RC) - log("LD-SHIFT:", "VL", vl, - "RC", RC.value, "imm", imm, - "offs", bin(offsmul), - ) - imm = SelectableInt((imm * offsmul) << RC.value, 32) - # Unit-Strided LD/ST adds offset*width to immediate - elif ldstmode == SVP64LDSTmode.UNITSTRIDE.value: - ldst_len = yield self.dec2.e.do.data_len - imm = SelectableInt(imm + offsmul * ldst_len, 32) - replace_d = True - # Element-strided multiplies the immediate by element step - elif ldstmode == SVP64LDSTmode.ELSTRIDE.value: - imm = SelectableInt(imm * offsmul, 32) - replace_d = True - if replace_d: - ldst_ra_vec = yield self.dec2.rm_dec.ldst_ra_vec - ldst_imz_in = yield self.dec2.rm_dec.ldst_imz_in - log("LDSTmode", SVP64LDSTmode(ldstmode), - offsmul, imm, ldst_ra_vec, ldst_imz_in) - # new replacement D... errr.. DS - if replace_d: - if info.form == 'DS': - # TODO: assert 2 LSBs are zero? - log("DS-Form, TODO, assert 2 LSBs zero?", bin(imm.value)) - imm.value = imm.value >> 2 - self.namespace['DS'] = imm - else: - self.namespace['D'] = imm + yield from self.check_replace_d(info, remap_active) # "special" registers for special in info.special_regs: @@ -1509,6 +1446,72 @@ class ISACaller(ISACallerHelper, ISAFPHelpers): if nia_update: self.update_pc_next() + def check_replace_d(self, info, remap_active): + replace_d = False # update / replace constant in pseudocode + ldstmode = yield self.dec2.rm_dec.ldstmode + # shift mode reads SVD (or SVDS - TODO) + # *BUT*... because this is "overloading" of LD operations, + # it gets *STORED* into D (or DS, TODO) + if ldstmode == SVP64LDSTmode.SHIFT.value: + imm = yield self.dec2.dec.fields.FormSVD.SVD[0:11] + imm = exts(imm, 11) # sign-extend to integer + log("shift SVD", imm) + replace_d = True + else: + if info.form == 'DS': + # DS-Form, multiply by 4 then knock 2 bits off after + imm = yield self.dec2.dec.fields.FormDS.DS[0:14] * 4 + else: + imm = yield self.dec2.dec.fields.FormD.D[0:16] + imm = exts(imm, 16) # sign-extend to integer + # get the right step. LD is from srcstep, ST is dststep + op = yield self.dec2.e.do.insn_type + offsmul = 0 + if op == MicrOp.OP_LOAD.value: + if remap_active: + offsmul = yield self.dec2.in1_step + log("D-field REMAP src", imm, offsmul) + else: + offsmul = (srcstep * (subvl+1)) + substep + log("D-field src", imm, offsmul) + elif op == MicrOp.OP_STORE.value: + # XXX NOTE! no bit-reversed STORE! this should not ever be used + offsmul = (dststep * (subvl+1)) + substep + log("D-field dst", imm, offsmul) + # bit-reverse mode, rev already done through get_src_dst_steps() + if ldstmode == SVP64LDSTmode.SHIFT.value: + # manually look up RC, sigh + RC = yield self.dec2.dec.RC[0:5] + RC = self.gpr(RC) + log("LD-SHIFT:", "VL", vl, + "RC", RC.value, "imm", imm, + "offs", bin(offsmul), + ) + imm = SelectableInt((imm * offsmul) << RC.value, 32) + # Unit-Strided LD/ST adds offset*width to immediate + elif ldstmode == SVP64LDSTmode.UNITSTRIDE.value: + ldst_len = yield self.dec2.e.do.data_len + imm = SelectableInt(imm + offsmul * ldst_len, 32) + replace_d = True + # Element-strided multiplies the immediate by element step + elif ldstmode == SVP64LDSTmode.ELSTRIDE.value: + imm = SelectableInt(imm * offsmul, 32) + replace_d = True + if replace_d: + ldst_ra_vec = yield self.dec2.rm_dec.ldst_ra_vec + ldst_imz_in = yield self.dec2.rm_dec.ldst_imz_in + log("LDSTmode", SVP64LDSTmode(ldstmode), + offsmul, imm, ldst_ra_vec, ldst_imz_in) + # new replacement D... errr.. DS + if replace_d: + if info.form == 'DS': + # TODO: assert 2 LSBs are zero? + log("DS-Form, TODO, assert 2 LSBs zero?", bin(imm.value)) + imm.value = imm.value >> 2 + self.namespace['DS'] = imm + else: + self.namespace['D'] = imm + def get_input(self, name): # using PowerDecoder2, first, find the decoder index. # (mapping name RA RB RC RS to in1, in2, in3)