From 31fcb21ef523434a254c0bbff515345c2c6d8152 Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Fri, 27 Feb 2015 10:59:17 -0800 Subject: i965: Avoid applying negate to wrong MAD source. For some given GLSL IR like (+ (neg x) (* 1.2 x)), the try_emit_mad function would see that one of the +'s sources was a negate expression and set mul_negate = true without confirming that it was actually a multiply. Cc: 10.5 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89315 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89095 Reviewed-by: Ian Romanick (cherry picked from commit d528907fd2950c7bb968fff66dd79863cd128890) [Emil Velikov: drop the changes in brw_vec4_visitor.cpp] Signed-off-by: Emil Velikov Conflicts: src/mesa/drivers/dri/i965/brw_fs_visitor.cpp src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp --- src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 28 +++++++++++++--------------- 1 file changed, 13 insertions(+), 15 deletions(-) (limited to 'src') diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp index 6cddcf5e7e9..d8e10dfa538 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp @@ -428,21 +428,16 @@ fs_visitor::try_emit_mad(ir_expression *ir) if (ir->type != glsl_type::float_type) return false; - ir_rvalue *nonmul = ir->operands[1]; - ir_expression *mul = ir->operands[0]->as_expression(); + ir_rvalue *nonmul; + ir_expression *mul; + bool mul_negate, mul_abs; - bool mul_negate = false, mul_abs = false; - if (mul && mul->operation == ir_unop_abs) { - mul = mul->operands[0]->as_expression(); - mul_abs = true; - } else if (mul && mul->operation == ir_unop_neg) { - mul = mul->operands[0]->as_expression(); - mul_negate = true; - } + for (int i = 0; i < 2; i++) { + mul_negate = false; + mul_abs = false; - if (!mul || mul->operation != ir_binop_mul) { - nonmul = ir->operands[0]; - mul = ir->operands[1]->as_expression(); + mul = ir->operands[i]->as_expression(); + nonmul = ir->operands[1 - i]; if (mul && mul->operation == ir_unop_abs) { mul = mul->operands[0]->as_expression(); @@ -452,10 +447,13 @@ fs_visitor::try_emit_mad(ir_expression *ir) mul_negate = true; } - if (!mul || mul->operation != ir_binop_mul) - return false; + if (mul && mul->operation == ir_binop_mul) + break; } + if (!mul || mul->operation != ir_binop_mul) + return false; + if (nonmul->as_constant() || mul->operands[0]->as_constant() || mul->operands[1]->as_constant()) -- cgit v1.2.3