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tcg: Add TCG_OPF_NOT_PRESENT if TCG_TARGET_HAS_foo is negative

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If INDEX_op_foo is always expanded by tcg_expand_vec_op, then
there may be no reasonable set of constraints to return from
tcg_target_op_def for that opcode.

Let TCG_TARGET_HAS_foo be specified as -1 in that case. Thus a
boolean test for TCG_TARGET_HAS_foo is true, but we will not
assert within process_op_defs when no constraints are specified.

Compare this with tcg_can_emit_vec_op, which already uses this
tri-state indication.

Backports commit 25c012b4009256505be3430480954a0233de343e from qemu
This commit is contained in:
Richard Henderson 2019-05-24 18:28:09 -04:00 committed by Lioncash
parent 568da655c6
commit a868533297
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 1 additions and 6 deletions
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7
qemu/tcg/tcg-opc.h
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@ -35,12 +35,7 @@ DEF(call, 0, 0, 3, TCG_OPF_CALL_CLOBBER | TCG_OPF_NOT_PRESENT)
DEF(br, 0, 0, 1, TCG_OPF_BB_END)
#ifdef _MSC_VER
#define IMPL(X) ((0 && !(X)) ? TCG_OPF_NOT_PRESENT : 0)
#else
#define IMPL(X) (__builtin_constant_p(X) && !(X) ? TCG_OPF_NOT_PRESENT : 0)
#endif
#define IMPL(X) (__builtin_constant_p(X) && (X) <= 0 ? TCG_OPF_NOT_PRESENT : 0)
#if TCG_TARGET_REG_BITS == 32
# define IMPL64 TCG_OPF_64BIT | TCG_OPF_NOT_PRESENT
#else