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tcg: Simplify logic using TCG_OPF_NOT_PRESENT 

Expand the definition of "not present" to include "should not be present".
This means we can simplify the logic surrounding the generic tcg opcodes
for which the host backend ought not be providing definitions.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-05-02 11:57:40 +01:00
parent 4ef76952bd
commit c1a61f6c85
3 changed files with 18 additions and 15 deletions
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26
tcg/tcg-opc.h
View File

@ -27,17 +27,21 @@
*/
/* predefined ops */
DEF(end, 0, 0, 0, 0) /* must be kept first */
DEF(nop, 0, 0, 0, 0)
DEF(nop1, 0, 0, 1, 0)
DEF(nop2, 0, 0, 2, 0)
DEF(nop3, 0, 0, 3, 0)
DEF(nopn, 0, 0, 1, 0) /* variable number of parameters */
DEF(end, 0, 0, 0, TCG_OPF_NOT_PRESENT) /* must be kept first */
DEF(nop, 0, 0, 0, TCG_OPF_NOT_PRESENT)
DEF(nop1, 0, 0, 1, TCG_OPF_NOT_PRESENT)
DEF(nop2, 0, 0, 2, TCG_OPF_NOT_PRESENT)
DEF(nop3, 0, 0, 3, TCG_OPF_NOT_PRESENT)
DEF(discard, 1, 0, 0, 0)
/* variable number of parameters */
DEF(nopn, 0, 0, 1, TCG_OPF_NOT_PRESENT)
DEF(discard, 1, 0, 0, TCG_OPF_NOT_PRESENT)
DEF(set_label, 0, 0, 1, TCG_OPF_BB_END | TCG_OPF_NOT_PRESENT)
/* variable number of parameters */
DEF(call, 0, 1, 2, TCG_OPF_CALL_CLOBBER)
DEF(set_label, 0, 0, 1, TCG_OPF_BB_END)
DEF(call, 0, 1, 2, TCG_OPF_CALL_CLOBBER) /* variable number of parameters */
DEF(br, 0, 0, 1, TCG_OPF_BB_END)
#define IMPL(X) (__builtin_constant_p(X) && !(X) ? TCG_OPF_NOT_PRESENT : 0)
@ -166,9 +170,9 @@ DEF(muls2_i64, 2, 2, 0, IMPL64 | IMPL(TCG_TARGET_HAS_muls2_i64))
/* QEMU specific */
#if TARGET_LONG_BITS > TCG_TARGET_REG_BITS
DEF(debug_insn_start, 0, 0, 2, 0)
DEF(debug_insn_start, 0, 0, 2, TCG_OPF_NOT_PRESENT)
#else
DEF(debug_insn_start, 0, 0, 1, 0)
DEF(debug_insn_start, 0, 0, 1, TCG_OPF_NOT_PRESENT)
#endif
DEF(exit_tb, 0, 0, 1, TCG_OPF_BB_END)
DEF(goto_tb, 0, 0, 1, TCG_OPF_BB_END)

4
tcg/tcg.c
View File

@ -1160,9 +1160,7 @@ void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs)
i = 0;
for (op = 0; op < ARRAY_SIZE(tcg_op_defs); op++) {
const TCGOpDef *def = &tcg_op_defs[op];
if (op < INDEX_op_call
|| op == INDEX_op_debug_insn_start
|| (def->flags & TCG_OPF_NOT_PRESENT)) {
if (def->flags & TCG_OPF_NOT_PRESENT) {
/* Wrong entry in op definitions? */
if (def->used) {
fprintf(stderr, "Invalid op definition for %s\n", def->name);

3
tcg/tcg.h
View File

@ -596,7 +596,8 @@ enum {
TCG_OPF_SIDE_EFFECTS = 0x04,
/* Instruction operands are 64-bits (otherwise 32-bits). */
TCG_OPF_64BIT = 0x08,
/* Instruction is optional and not implemented by the host. */
/* Instruction is optional and not implemented by the host, or insn
is generic and should not be implemened by the host. */
TCG_OPF_NOT_PRESENT = 0x10,
};