diff options
| author | xavier <xavierb@gmail.com> | 2016-03-09 09:58:48 +0100 |
|---|---|---|
| committer | Emil Velikov <emil.l.velikov@gmail.com> | 2016-04-14 22:35:05 +0100 |
| commit | fbc184041ec293cc01a36988b0ed5e129f790ae6 (patch) | |
| tree | e499bc2c03eac94f251afa938a24fb494a879c15 | |
| parent | 9383b06d3e89da408527878ec143f066a7476250 (diff) | |
r600/sb: Do not distribute neg in expr_handler::fold_assoc() when folding multiplications.
Previously it was doing this transformation for a Trine 3 shader:
MUL R6.x.12, R13.x.23, 0.5|3f000000
- MULADD R4.x.12, -R6.x.12, 2|40000000, 1|3f800000
+ MULADD R4.x.12, -R13.x.23, -1|bf800000, 1|3f800000
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94412
Signed-off-by: Xavier Bouchoux <xavierb@gmail.com>
Cc: "11.0 11.1 11.2" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Glenn Kennard <glenn.kennard@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit fce0b55ccbc33d320b9734a53c2a9f7886450c73)
| -rw-r--r-- | src/gallium/drivers/r600/sb/sb_expr.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/gallium/drivers/r600/sb/sb_expr.cpp b/src/gallium/drivers/r600/sb/sb_expr.cpp index 556a05da395..3dd3a4815ba 100644 --- a/src/gallium/drivers/r600/sb/sb_expr.cpp +++ b/src/gallium/drivers/r600/sb/sb_expr.cpp @@ -598,9 +598,13 @@ bool expr_handler::fold_assoc(alu_node *n) { unsigned op = n->bc.op; bool allow_neg = false, cur_neg = false; + bool distribute_neg = false; switch(op) { case ALU_OP2_ADD: + distribute_neg = true; + allow_neg = true; + break; case ALU_OP2_MUL: case ALU_OP2_MUL_IEEE: allow_neg = true; @@ -632,7 +636,7 @@ bool expr_handler::fold_assoc(alu_node *n) { if (v1->is_const()) { literal arg = v1->get_const_value(); apply_alu_src_mod(a->bc, 1, arg); - if (cur_neg) + if (cur_neg && distribute_neg) arg.f = -arg.f; if (a == n) @@ -660,7 +664,7 @@ bool expr_handler::fold_assoc(alu_node *n) { if (v0->is_const()) { literal arg = v0->get_const_value(); apply_alu_src_mod(a->bc, 0, arg); - if (cur_neg) + if (cur_neg && distribute_neg) arg.f = -arg.f; if (last_arg == 0) { |