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MIPS/opcodes: Factor out ISA matching against flags

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In preparation for the next change factor out code for ISA matching
against instruction flags used in MIPS opcode tables, similarly to how
CPU matching is already done.  No functional change, though for clarity
split the single `if' statement into multiple ones and use temporaries
rather than repeated expressions.

	include/
	* opcode/mips.h (isa_is_member): New inline function, factored
	out from...
	(opcode_is_member): ... here.
This commit is contained in:
Maciej W. Rozycki
2021-05-29 03:26:32 +02:00
parent dd84446824
commit b1458c4569
2 changed files with 27 additions and 4 deletions
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25
include/opcode/mips.h
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@ -1471,6 +1471,26 @@ cpu_is_member (int cpu, unsigned int mask)
}
}
/* Return true if the given ISA is included in INSN_* mask MASK. */
static inline bool
isa_is_member (int isa, unsigned int mask)
{
isa &= INSN_ISA_MASK;
mask &= INSN_ISA_MASK;
if (isa == 0)
return false;
if (mask == 0)
return false;
if (((mips_isa_table[isa - 1] >> (mask - 1)) & 1) == 0)
return false;
return true;
}
/* Test for membership in an ISA including chip specific ISAs. INSN
is pointer to an element of the opcode table; ISA is the specified
ISA/ASE bitmask to test against; and CPU is the CPU specific ISA to
@ -1483,10 +1503,7 @@ opcode_is_member (const struct mips_opcode *insn, int isa, int ase, int cpu)
if (!cpu_is_member (cpu, insn->exclusions))
{
/* Test for ISA level compatibility. */
if ((isa & INSN_ISA_MASK) != 0
&& (insn->membership & INSN_ISA_MASK) != 0
&& ((mips_isa_table[(isa & INSN_ISA_MASK) - 1]
>> ((insn->membership & INSN_ISA_MASK) - 1)) & 1) != 0)
if (isa_is_member (isa, insn->membership))
return true;
/* Test for ASE compatibility. */