From: Jim Wilson Date: Fri, 8 Feb 2019 20:57:12 +0000 (-0800) Subject: RISC-V: Compress 3-operand beq/bne against x0. X-Git-Tag: gdb-8.3-release~239 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ca0bc1509849a3871e99fdf48705b93f18d5fa7b;p=thirdparty%2Fbinutils-gdb.git RISC-V: Compress 3-operand beq/bne against x0. This lets us accept an instruction like beq a2,x0,.Label and generate a compressed beqz. This will allow some future simplications to the gcc support, e.g. eliminating some duplicate patterns, and avoiding adding new duplicate patterns, since currently we have to handle signed and equality compares against zero specially. Tested with rv{32,64}-{elf,linux} cross builds and make checks for binutils and gcc. There were no regressions. gas/ * config/tc-riscv.c (validate_riscv_insn) <'C'>: Add 'z' support. (riscv_ip) <'C'>: Add 'z' support. opcodes/ * riscv-opc.c (riscv_opcodes) : Use Cz to compress 3 operand form. : Likewise. --- diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c index 993161568ff..99b007f59f1 100644 --- a/gas/config/tc-riscv.c +++ b/gas/config/tc-riscv.c @@ -586,6 +586,7 @@ validate_riscv_insn (const struct riscv_opcode *opc, int length) case 'v': used_bits |= ENCODE_RVC_IMM (-1U); break; case 'w': break; /* RS1S, constrained to equal RD */ case 'x': break; /* RS2S, constrained to equal RD */ + case 'z': break; /* RS2S, contrained to be x0 */ case 'K': used_bits |= ENCODE_RVC_ADDI4SPN_IMM (-1U); break; case 'L': used_bits |= ENCODE_RVC_ADDI16SP_IMM (-1U); break; case 'M': used_bits |= ENCODE_RVC_SWSP_IMM (-1U); break; @@ -1472,6 +1473,11 @@ riscv_ip (char *str, struct riscv_cl_insn *ip, expressionS *imm_expr, || regno != X_SP) break; continue; + case 'z': /* RS2, contrained to equal x0. */ + if (!reg_lookup (&s, RCLASS_GPR, ®no) + || regno != 0) + break; + continue; case '>': if (my_getSmallExpression (imm_expr, imm_reloc, s, p) || imm_expr->X_op != O_constant diff --git a/opcodes/riscv-opc.c b/opcodes/riscv-opc.c index 72e6b9d48f9..bd652590b58 100644 --- a/opcodes/riscv-opc.c +++ b/opcodes/riscv-opc.c @@ -247,6 +247,7 @@ const struct riscv_opcode riscv_opcodes[] = {"and", 0, {"I", 0}, "d,s,j", MATCH_ANDI, MASK_ANDI, match_opcode, INSN_ALIAS }, {"beqz", 0, {"C", 0}, "Cs,Cp", MATCH_C_BEQZ, MASK_C_BEQZ, match_opcode, INSN_ALIAS|INSN_CONDBRANCH }, {"beqz", 0, {"I", 0}, "s,p", MATCH_BEQ, MASK_BEQ | MASK_RS2, match_opcode, INSN_ALIAS|INSN_CONDBRANCH }, +{"beq", 0, {"C", 0}, "Cs,Cz,Cp", MATCH_C_BEQZ, MASK_C_BEQZ, match_opcode, INSN_ALIAS|INSN_CONDBRANCH }, {"beq", 0, {"I", 0}, "s,t,p", MATCH_BEQ, MASK_BEQ, match_opcode, INSN_CONDBRANCH }, {"blez", 0, {"I", 0}, "t,p", MATCH_BGE, MASK_BGE | MASK_RS1, match_opcode, INSN_ALIAS|INSN_CONDBRANCH }, {"bgez", 0, {"I", 0}, "s,p", MATCH_BGE, MASK_BGE | MASK_RS2, match_opcode, INSN_ALIAS|INSN_CONDBRANCH }, @@ -262,6 +263,7 @@ const struct riscv_opcode riscv_opcodes[] = {"bgtu", 0, {"I", 0}, "t,s,p", MATCH_BLTU, MASK_BLTU, match_opcode, INSN_ALIAS|INSN_CONDBRANCH }, {"bnez", 0, {"C", 0}, "Cs,Cp", MATCH_C_BNEZ, MASK_C_BNEZ, match_opcode, INSN_ALIAS|INSN_CONDBRANCH }, {"bnez", 0, {"I", 0}, "s,p", MATCH_BNE, MASK_BNE | MASK_RS2, match_opcode, INSN_ALIAS|INSN_CONDBRANCH }, +{"bne", 0, {"C", 0}, "Cs,Cz,Cp", MATCH_C_BNEZ, MASK_C_BNEZ, match_opcode, INSN_ALIAS|INSN_CONDBRANCH }, {"bne", 0, {"I", 0}, "s,t,p", MATCH_BNE, MASK_BNE, match_opcode, INSN_CONDBRANCH }, {"addi", 0, {"C", 0}, "Ct,Cc,CK", MATCH_C_ADDI4SPN, MASK_C_ADDI4SPN, match_c_addi4spn, INSN_ALIAS }, {"addi", 0, {"C", 0}, "d,CU,Cj", MATCH_C_ADDI, MASK_C_ADDI, match_rd_nonzero, INSN_ALIAS },