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tcg/optimize: Copy mask writeback to fold_masks

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Use of fold_masks should be restricted to those opcodes that
can reliably make use of it -- those with a single output,
and from higher-level folders that set up the masks.
Prepare for conversion of each folder in turn.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-08 18:26:48 -06:00
parent 045ace35a8
commit 56e06ecfa5
1 changed files with 14 additions and 3 deletions
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17
tcg/optimize.c
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@ -1048,6 +1048,12 @@ static bool fold_masks(OptContext *ctx, TCGOp *op)
{ {
uint64_t z_mask = ctx->z_mask; uint64_t z_mask = ctx->z_mask;
uint64_t s_mask = ctx->s_mask; uint64_t s_mask = ctx->s_mask;
const TCGOpDef *def = &tcg_op_defs[op->opc];
TCGTemp *ts;
TempOptInfo *ti;
/* Only single-output opcodes are supported here. */
tcg_debug_assert(def->nb_oargs == 1);
/* /*
* 32-bit ops generate 32-bit results, which for the purpose of * 32-bit ops generate 32-bit results, which for the purpose of
@ -1059,14 +1065,19 @@ static bool fold_masks(OptContext *ctx, TCGOp *op)
if (ctx->type == TCG_TYPE_I32) { if (ctx->type == TCG_TYPE_I32) {
z_mask = (int32_t)z_mask; z_mask = (int32_t)z_mask;
s_mask |= MAKE_64BIT_MASK(32, 32); s_mask |= MAKE_64BIT_MASK(32, 32);
ctx->z_mask = z_mask;
ctx->s_mask = s_mask;
} }
if (z_mask == 0) { if (z_mask == 0) {
return tcg_opt_gen_movi(ctx, op, op->args[0], 0); return tcg_opt_gen_movi(ctx, op, op->args[0], 0);
} }
return false;
ts = arg_temp(op->args[0]);
reset_ts(ctx, ts);
ti = ts_info(ts);
ti->z_mask = z_mask;
ti->s_mask = s_mask;
return true;
} }
/* /*