From e52959e9612e6e645407c6256d35fac9c8fe3276 Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Fri, 18 Oct 2013 16:02:11 -0700 Subject: i965/fs: Match commutative expressions with reversed arguments. total instructions in shared programs: 1645011 -> 1644938 (-0.00%) instructions in affected programs: 17543 -> 17470 (-0.42%) Reviewed-by: Eric Anholt --- src/mesa/drivers/dri/i965/brw_fs_cse.cpp | 26 +++++++++++++++++++++++--- 1 file changed, 23 insertions(+), 3 deletions(-) (limited to 'src') diff --git a/src/mesa/drivers/dri/i965/brw_fs_cse.cpp b/src/mesa/drivers/dri/i965/brw_fs_cse.cpp index ab3e561724b..0afc5f65f6e 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_cse.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_cse.cpp @@ -77,9 +77,29 @@ is_expression(const fs_inst *const inst) } static bool -operands_match(fs_reg *xs, fs_reg *ys) +is_expression_commutative(enum opcode op) { - return xs[0].equals(ys[0]) && xs[1].equals(ys[1]) && xs[2].equals(ys[2]); + switch (op) { + case BRW_OPCODE_AND: + case BRW_OPCODE_OR: + case BRW_OPCODE_XOR: + case BRW_OPCODE_ADD: + case BRW_OPCODE_MUL: + return true; + default: + return false; + } +} + +static bool +operands_match(enum opcode op, fs_reg *xs, fs_reg *ys) +{ + if (!is_expression_commutative(op)) { + return xs[0].equals(ys[0]) && xs[1].equals(ys[1]) && xs[2].equals(ys[2]); + } else { + return (xs[0].equals(ys[0]) && xs[1].equals(ys[1])) || + (xs[1].equals(ys[0]) && xs[0].equals(ys[1])); + } } bool @@ -111,7 +131,7 @@ fs_visitor::opt_cse_local(bblock_t *block, exec_list *aeb) if (inst->opcode == entry->generator->opcode && inst->saturate == entry->generator->saturate && inst->dst.type == entry->generator->dst.type && - operands_match(entry->generator->src, inst->src)) { + operands_match(inst->opcode, entry->generator->src, inst->src)) { found = true; progress = true; -- cgit v1.2.3