x86: drop dead code from build_modrm_byte()
There are no templates with VexImmExt and ImmExt set at the same time. There are also no VEX3SOURCES templates with CpuFMA. I assume both are left-overs from the implementation of an early specification which was later revised.
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@ -1,3 +1,9 @@
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2018-04-26 Jan Beulich <jbeulich@suse.com>
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* config/tc-i386.c (build_modrm_byte): Drop code dealing with
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.veximmext and .immext set at the same time. Drop code dealing
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with .cpufma when .vexsources == VEX3SOURCES.
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2018-04-25 Christophe Lyon <christophe.lyon@st.com>
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Mickaël Guêné <mickael.guene@st.com>
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@ -6567,22 +6567,16 @@ build_modrm_byte (void)
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unsigned int source, dest;
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int vex_3_sources;
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/* The first operand of instructions with VEX prefix and 3 sources
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must be VEX_Imm4. */
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vex_3_sources = i.tm.opcode_modifier.vexsources == VEX3SOURCES;
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if (vex_3_sources)
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{
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unsigned int nds, reg_slot;
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expressionS *exp;
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if (i.tm.opcode_modifier.veximmext
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&& i.tm.opcode_modifier.immext)
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{
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dest = i.operands - 2;
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gas_assert (dest == 3);
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}
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else
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dest = i.operands - 1;
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gas_assert (!i.tm.opcode_modifier.veximmext
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|| !i.tm.opcode_modifier.immext);
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dest = i.operands - 1;
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nds = dest - 1;
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/* There are 2 kinds of instructions:
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@ -6623,15 +6617,6 @@ build_modrm_byte (void)
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reg_slot = 0;
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}
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/* FMA swaps REG and NDS. */
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if (i.tm.cpu_flags.bitfield.cpufma)
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{
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unsigned int tmp;
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tmp = reg_slot;
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reg_slot = nds;
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nds = tmp;
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}
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gas_assert (i.tm.operand_types[reg_slot].bitfield.regsimd);
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exp->X_op = O_constant;
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exp->X_add_number = register_number (i.op[reg_slot].regs) << 4;
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