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logical: Use sub_select rather than insn_type to select logical op
Also select the RS passthrough in the logical unit by default for mfspr, which is needed for the no-op SPRs and the no-op behaviour of privileged mfspr to unimplemented SPRs. For slow SPRs the RS behaviour gets passed through from execute1 to execute2 and replaced by the correct result in execute2's result mux. Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras
34
decode1.vhdl
34
decode1.vhdl
@@ -103,14 +103,14 @@ architecture behaviour of decode1 is
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INSN_bclr => (ALU, NONE, OP_BCREG, NONE, IMM, NONE, NONE, NONE, SPR, "000", '1', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '1', '0', '0', NONE),
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INSN_bctar => (ALU, NONE, OP_BCREG, NONE, IMM, NONE, NONE, NONE, SPR, "000", '1', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '1', '0', '0', NONE),
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INSN_bperm => (ALU, NONE, OP_BPERM, NONE, RB, NONE, RS, RA, ADD, "100", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_brh => (ALU, NONE, OP_BREV, NONE, IMM, NONE, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', is2B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_brw => (ALU, NONE, OP_BREV, NONE, IMM, NONE, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', is4B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_brd => (ALU, NONE, OP_BREV, NONE, IMM, NONE, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', is8B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_cbcdtd => (ALU, NONE, OP_BCD, NONE, IMM, NONE, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_cdtbcd => (ALU, NONE, OP_BCD, NONE, IMM, NONE, RS, RA, LOG, "000", '0', '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_brh => (ALU, NONE, OP_BREV, NONE, IMM, NONE, RS, RA, LOG, "010", '0', '0', '0', '0', ZERO, '0', is2B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_brw => (ALU, NONE, OP_BREV, NONE, IMM, NONE, RS, RA, LOG, "010", '0', '0', '0', '0', ZERO, '0', is4B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_brd => (ALU, NONE, OP_BREV, NONE, IMM, NONE, RS, RA, LOG, "010", '0', '0', '0', '0', ZERO, '0', is8B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_cbcdtd => (ALU, NONE, OP_BCD, NONE, IMM, NONE, RS, RA, LOG, "101", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_cdtbcd => (ALU, NONE, OP_BCD, NONE, IMM, NONE, RS, RA, LOG, "101", '0', '0', '1', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_cfuged => (ALU, NONE, OP_BSORT, NONE, RB, NONE, RS, RA, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_cmp => (ALU, NONE, OP_CMP, RA, RB, NONE, NONE, NONE, ADD, "000", '0', '1', '1', '0', ONE, '0', NONE, '0', '0', '0', '0', '0', '1', NONE, '0', '0', '0', NONE),
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INSN_cmpb => (ALU, NONE, OP_CMPB, NONE, RB, NONE, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_cmpb => (ALU, NONE, OP_CMPB, NONE, RB, NONE, RS, RA, LOG, "100", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_cmpeqb => (ALU, NONE, OP_CMPEQB, RA, RB, NONE, NONE, NONE, ADD, "010", '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_cmpi => (ALU, NONE, OP_CMP, RA, IMM, CONST_SI, NONE, NONE, ADD, "000", '0', '1', '1', '0', ONE, '0', NONE, '0', '0', '0', '0', '0', '1', NONE, '0', '0', '0', NONE),
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INSN_cmpl => (ALU, NONE, OP_CMP, RA, RB, NONE, NONE, NONE, ADD, "000", '0', '1', '1', '0', ONE, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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@@ -143,10 +143,10 @@ architecture behaviour of decode1 is
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INSN_divweu => (DVU, NONE, OP_DIVE, RA, RB, NONE, NONE, RT, ADD, "101", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', RCOE, '0', '0', '0', NONE),
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INSN_divwu => (DVU, NONE, OP_DIV, RA, RB, NONE, NONE, RT, ADD, "101", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', RCOE, '0', '0', '0', NONE),
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INSN_eieio => (ALU, NONE, OP_NOP, NONE, IMM, NONE, NONE, NONE, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_eqv => (ALU, NONE, OP_XOR, NONE, RB, NONE, RS, RA, LOG, "000", '0', '0', '0', '1', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_extsb => (ALU, NONE, OP_EXTS, NONE, IMM, NONE, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', is1B, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_extsh => (ALU, NONE, OP_EXTS, NONE, IMM, NONE, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', is2B, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_extsw => (ALU, NONE, OP_EXTS, NONE, IMM, NONE, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', is4B, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_eqv => (ALU, NONE, OP_XOR, NONE, RB, NONE, RS, RA, LOG, "001", '0', '0', '0', '1', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_extsb => (ALU, NONE, OP_EXTS, NONE, IMM, NONE, RS, RA, LOG, "110", '0', '0', '0', '0', ZERO, '0', is1B, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_extsh => (ALU, NONE, OP_EXTS, NONE, IMM, NONE, RS, RA, LOG, "110", '0', '0', '0', '0', ZERO, '0', is2B, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_extsw => (ALU, NONE, OP_EXTS, NONE, IMM, NONE, RS, RA, LOG, "110", '0', '0', '0', '0', ZERO, '0', is4B, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_extswsli => (ALU, NONE, OP_EXTSWSLI, NONE, IMM, CONST_SH, RS, RA, ROT, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_fabs => (FPU, FPU, OP_FP_MOVE, NONE, FRB, NONE, NONE, FRT, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_fadd => (FPU, FPU, OP_FP_ARITH, FRA, FRB, NONE, NONE, FRT, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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@@ -262,7 +262,7 @@ architecture behaviour of decode1 is
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INSN_mfcr => (ALU, NONE, OP_MFCR, NONE, IMM, NONE, NONE, RT, MSC, "101", '1', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_mffs => (FPU, FPU, OP_FP_MISC, NONE, FRB, NONE, NONE, FRT, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_mfmsr => (ALU, NONE, OP_MFMSR, NONE, IMM, NONE, NONE, RT, MSC, "100", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1', '1', NONE),
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INSN_mfspr => (ALU, NONE, OP_MFSPR, NONE, IMM, NONE, RS, RT, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_mfspr => (ALU, NONE, OP_MFSPR, NONE, IMM, NONE, RS, RT, LOG, "111", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_modsd => (DVU, NONE, OP_MOD, RA, RB, NONE, NONE, RT, ADD, "101", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', NONE, '0', '0', '0', NONE),
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INSN_modsw => (DVU, NONE, OP_MOD, RA, RB, NONE, NONE, RT, ADD, "101", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', NONE, '0', '0', '0', NONE),
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INSN_modud => (DVU, NONE, OP_MOD, RA, RB, NONE, NONE, RT, ADD, "101", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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@@ -273,7 +273,7 @@ architecture behaviour of decode1 is
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INSN_mtfsfi => (FPU, FPU, OP_FP_MISC, NONE, IMM, NONE, NONE, NONE, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_mtmsr => (ALU, NONE, OP_MTMSRD, NONE, IMM, NONE, RS, NONE, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', NONE, '0', '1', '0', NONE),
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INSN_mtmsrd => (ALU, NONE, OP_MTMSRD, NONE, IMM, NONE, RS, NONE, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1', '0', NONE),
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INSN_mtspr => (ALU, NONE, OP_MTSPR, NONE, IMM, NONE, RS, NONE, LOG, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_mtspr => (ALU, NONE, OP_MTSPR, NONE, IMM, NONE, RS, NONE, LOG, "111", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_mulhd => (ALU, NONE, OP_MUL_H64, RA, RB, NONE, NONE, RT, ADD, "010", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', RC, '0', '0', '0', NONE),
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INSN_mulhdu => (ALU, NONE, OP_MUL_H64, RA, RB, NONE, NONE, RT, ADD, "010", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_mulhw => (ALU, NONE, OP_MUL_H32, RA, RB, NONE, NONE, RT, ADD, "001", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', RC, '0', '0', '0', NONE),
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@@ -312,8 +312,8 @@ architecture behaviour of decode1 is
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INSN_popcntb => (ALU, NONE, OP_COUNTB, NONE, IMM, NONE, RS, RA, ADD, "000", '0', '0', '0', '0', ZERO, '0', is1B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_popcntd => (ALU, NONE, OP_COUNTB, NONE, IMM, NONE, RS, RA, ADD, "000", '0', '0', '0', '0', ZERO, '0', is8B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_popcntw => (ALU, NONE, OP_COUNTB, NONE, IMM, NONE, RS, RA, ADD, "000", '0', '0', '0', '0', ZERO, '0', is4B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_prtyd => (ALU, NONE, OP_PRTY, NONE, IMM, NONE, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', is8B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_prtyw => (ALU, NONE, OP_PRTY, NONE, IMM, NONE, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', is4B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_prtyd => (ALU, NONE, OP_PRTY, NONE, IMM, NONE, RS, RA, LOG, "011", '0', '0', '0', '0', ZERO, '0', is8B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_prtyw => (ALU, NONE, OP_PRTY, NONE, IMM, NONE, RS, RA, LOG, "011", '0', '0', '0', '0', ZERO, '0', is4B, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_rfid => (ALU, NONE, OP_RFID, NONE, IMM, NONE, NONE, NONE, SPR, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1', '0', NONE),
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INSN_rfscv => (ALU, NONE, OP_RFID, NONE, IMM, NONE, NONE, NONE, SPR, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1', '0', NONE),
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INSN_rldcl => (ALU, NONE, OP_RLCL, NONE, RB, NONE, RS, RA, ROT, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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@@ -390,9 +390,9 @@ architecture behaviour of decode1 is
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INSN_tw => (ALU, NONE, OP_TRAP, RA, RB, NONE, NONE, NONE, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', NONE, '0', '0', '0', NONE),
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INSN_twi => (ALU, NONE, OP_TRAP, RA, IMM, CONST_SI, NONE, NONE, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', NONE, '0', '0', '0', NONE),
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INSN_wait => (ALU, NONE, OP_WAIT, NONE, IMM, NONE, NONE, NONE, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '1', NONE),
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INSN_xor => (ALU, NONE, OP_XOR, NONE, RB, NONE, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_xori => (ALU, NONE, OP_XOR, NONE, IMM, CONST_UI, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_xoris => (ALU, NONE, OP_XOR, NONE, IMM, CONST_UI_HI, RS, RA, LOG, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_xor => (ALU, NONE, OP_XOR, NONE, RB, NONE, RS, RA, LOG, "001", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0', '0', NONE),
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INSN_xori => (ALU, NONE, OP_XOR, NONE, IMM, CONST_UI, RS, RA, LOG, "001", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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INSN_xoris => (ALU, NONE, OP_XOR, NONE, IMM, CONST_UI_HI, RS, RA, LOG, "001", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE),
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others => (ALU, NONE, OP_ILLEGAL, NONE, IMM, NONE, NONE, NONE, ADD, "000", '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0', '0', NONE)
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);
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@@ -617,12 +617,6 @@ begin
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if op = OP_MFSPR then
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if d_in.ram_spr.valid = '1' then
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v.e.result_sel := SPR; -- ramspr_result
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elsif d_in.spr_info.valid = '0' or d_in.spr_info.wonly = '1' or
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d_in.spr_info.noop = '1' then
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-- Privileged mfspr to invalid/unimplemented SPR numbers
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-- writes the contents of RT back to RT (i.e. it's a no-op)
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-- as does any mfspr from the reserved/noop SPR numbers
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v.e.result_sel := LOG; -- logical_result
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end if;
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end if;
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v.e.privileged := d_in.decode.privileged;
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@@ -496,7 +496,7 @@ begin
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port map (
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rs => c_in,
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rb => b_in,
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op => e_in.insn_type,
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op => e_in.sub_select,
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invert_in => e_in.invert_a,
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invert_out => e_in.invert_out,
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is_signed => e_in.is_signed,
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16
logical.vhdl
16
logical.vhdl
@@ -10,7 +10,7 @@ entity logical is
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port (
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rs : in std_ulogic_vector(63 downto 0);
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rb : in std_ulogic_vector(63 downto 0);
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op : in insn_type_t;
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op : in subresult_sel_t;
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invert_in : in std_ulogic;
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invert_out : in std_ulogic;
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is_signed : in std_ulogic;
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@@ -114,7 +114,7 @@ begin
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end if;
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case op is
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when OP_LOGIC =>
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when "000" => -- OP_LOGIC
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-- for now, abuse the 'is_signed' field to indicate inversion of RS
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rs_adj := rs;
|
||||
if is_signed = '1' then
|
||||
@@ -124,13 +124,13 @@ begin
|
||||
if invert_out = '1' then
|
||||
tmp := not tmp;
|
||||
end if;
|
||||
when OP_XOR =>
|
||||
when "001" => -- OP_XOR
|
||||
tmp := rs xor rb;
|
||||
if invert_out = '1' then
|
||||
tmp := not tmp;
|
||||
end if;
|
||||
|
||||
when OP_BREV =>
|
||||
when "010" => -- OP_BREV
|
||||
if datalen(3) = '1' then
|
||||
tmp := rs( 7 downto 0) & rs(15 downto 8) & rs(23 downto 16) & rs(31 downto 24) &
|
||||
rs(39 downto 32) & rs(47 downto 40) & rs(55 downto 48) & rs(63 downto 56);
|
||||
@@ -142,11 +142,11 @@ begin
|
||||
rs(23 downto 16) & rs(31 downto 24) & rs( 7 downto 0) & rs(15 downto 8);
|
||||
end if;
|
||||
|
||||
when OP_PRTY =>
|
||||
when "011" => -- OP_PRTY
|
||||
tmp := parity;
|
||||
when OP_CMPB =>
|
||||
when "100" => -- OP_CMPB
|
||||
tmp := ppc_cmpb(rs, rb);
|
||||
when OP_BCD =>
|
||||
when "101" => -- OP_BCD
|
||||
-- invert_in is abused to indicate direction of conversion
|
||||
if invert_in = '0' then
|
||||
-- cbcdtd
|
||||
@@ -157,7 +157,7 @@ begin
|
||||
tmp := x"00" & dpd_to_bcd(rs(51 downto 42)) & dpd_to_bcd(rs(41 downto 32)) &
|
||||
x"00" & dpd_to_bcd(rs(19 downto 10)) & dpd_to_bcd(rs(9 downto 0));
|
||||
end if;
|
||||
when OP_EXTS =>
|
||||
when "110" => -- OP_EXTS
|
||||
-- note datalen is a 1-hot encoding
|
||||
negative := (datalen(0) and rs(7)) or
|
||||
(datalen(1) and rs(15)) or
|
||||
|
||||
Reference in New Issue
Block a user