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t_dd_dmatmp: Use addition instead of subtraction in loop bounds

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This is used everywhere else in this file because it avoids problems
when count is zero (due to trimming).

No piglit regressions on i915 (G33) or radeon (Radeon 7500).

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=38109
Reviewed-by: Brian Paul <brianp@vmware.com>
Cc: Marius Predut <marius.predut@intel.com>
Cc: "10.6 11.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit 25543d8ec5)
This commit is contained in:
Ian Romanick 2015-09-14 11:59:22 -07:00 • committed by Emil Velikov
parent e0a6546ddd
commit dad649b66c
1 changed files with 1 additions and 1 deletions
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2
src/mesa/tnl_dd/t_dd_dmatmp.h
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@ -623,7 +623,7 @@ static void TAG(render_quads_verts)( struct gl_context *ctx,
INIT(GL_TRIANGLES);
for (j = 0; j < count-3; j += 4) {
for (j = 0; j + 3 < count; j += 4) {
void *tmp = ALLOC_VERTS( 6 );
/* Send v0, v1, v3
*/