From 4009a9ead490ef1718e6fa83141aa086a43cd901 Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Tue, 10 Feb 2015 17:45:28 -0800 Subject: [PATCH] i965/fs: Allow saturate propagation to propagate negations into MADs. Allows us to transform mad res src0 src1 src2 mov.sat dst -res into mad.sat dst -src0 -src1 src2 instructions in affected programs: 3712 -> 3688 (-0.65%) helped: 24 Reviewed-by: Ian Romanick --- src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp b/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp index 7c825097ca2..dc2b0c8aa8d 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp @@ -86,6 +86,10 @@ opt_saturate_propagation_local(fs_visitor *v, bblock_t *block) if (scan_inst->opcode == BRW_OPCODE_MUL) { scan_inst->src[0].negate = !scan_inst->src[0].negate; inst->src[0].negate = false; + } else if (scan_inst->opcode == BRW_OPCODE_MAD) { + scan_inst->src[0].negate = !scan_inst->src[0].negate; + scan_inst->src[1].negate = !scan_inst->src[1].negate; + inst->src[0].negate = false; } else if (scan_inst->opcode == BRW_OPCODE_ADD) { if (scan_inst->src[1].file == IMM) { if (!brw_negate_immediate(scan_inst->src[1].type, -- 2.30.2