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Only skip zero repeat expressions in a concatenation.

This commit is contained in:
Cary R 2015-02-02 18:13:50 -08:00
parent 84c592b068
commit 01ba41afd8
1 changed files with 14 additions and 9 deletions
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23
tgt-vvp/eval_vec4.c
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@ -808,22 +808,26 @@ static void draw_concat_vec4(ivl_expr_t expr)
concatenation. */
unsigned num_sube = ivl_expr_parms(expr);
unsigned sub_idx = 0;
ivl_expr_t sube;
assert(num_sube > 0);
/* Start with the most-significant bits. */
draw_eval_vec4(ivl_expr_parm(expr, sub_idx));
/* Evaluate, but skip any zero width elements at the head of the
* concatenation since they are (zero replications). */
while (ivl_expr_width(ivl_expr_parm(expr, sub_idx)) == 0) {
sube = ivl_expr_parm(expr, sub_idx);
draw_eval_vec4(sube);
/* Evaluate, but skip any zero replication expressions at the
* head of this concatenation. */
while ((ivl_expr_type(sube) == IVL_EX_CONCAT) &&
(ivl_expr_repeat(sube) == 0)) {
fprintf(vvp_out, " %%pop/vec4 1; skip zero replication\n");
sub_idx += 1;
draw_eval_vec4(ivl_expr_parm(expr, sub_idx));
sube = ivl_expr_parm(expr, sub_idx);
draw_eval_vec4(sube);
}
for ( sub_idx += 1 ; sub_idx < num_sube ; sub_idx += 1) {
/* Concatenate progressively lower parts. */
ivl_expr_t sube = ivl_expr_parm(expr, sub_idx);
sube = ivl_expr_parm(expr, sub_idx);
/* Special case: The next expression is a NUMBER that
can be concatenated using %concati/vec4
@ -834,9 +838,10 @@ static void draw_concat_vec4(ivl_expr_t expr)
}
draw_eval_vec4(sube);
/* Evaluate, but skip any zero width elements in the rest of the
* concatenation since they are also (zero replications). */
if (ivl_expr_width(sube) == 0) {
/* Evaluate, but skip any zero replication expressions in the
* rest of this concatenation. */
if ((ivl_expr_type(sube) == IVL_EX_CONCAT) &&
(ivl_expr_repeat(sube) == 0)) {
fprintf(vvp_out, " %%pop/vec4 1; skip zero replication\n");
continue;
}