From fce0b55ccbc33d320b9734a53c2a9f7886450c73 Mon Sep 17 00:00:00 2001 From: xavier Date: Wed, 9 Mar 2016 09:58:48 +0100 Subject: [PATCH] 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 Cc: "11.0 11.1 11.2" Reviewed-by: Glenn Kennard Signed-off-by: Dave Airlie --- src/gallium/drivers/r600/sb/sb_expr.cpp | 8 ++++++-- 1 file 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) { -- 2.30.2