From: Revital Eres Date: Fri, 30 Sep 2011 13:10:56 +0000 (+0000) Subject: SMS: Avoid generating redundant reg-moves X-Git-Tag: releases/gcc-4.7.0~3455 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=442b891d022ef2a3a57fcc6210cab4bd9759902c;p=thirdparty%2Fgcc.git SMS: Avoid generating redundant reg-moves From-SVN: r179380 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index c20caa8687e2..b0756d068374 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2011-09-30 Revital Eres + + * modulo-sched.c (generate_reg_moves): Skip instructions that + do not set a register and verify no regmoves are created for + !single_set instructions. + 2011-09-30 Bernd Schmidt * hw-doloop.c (scan_loop): Compute register usage only for non-debug diff --git a/gcc/modulo-sched.c b/gcc/modulo-sched.c index 28be9425b449..7c33be54bb5d 100644 --- a/gcc/modulo-sched.c +++ b/gcc/modulo-sched.c @@ -476,7 +476,12 @@ generate_reg_moves (partial_schedule_ptr ps, bool rescan) sbitmap *uses_of_defs; rtx last_reg_move; rtx prev_reg, old_reg; - + rtx set = single_set (u->insn); + + /* Skip instructions that do not set a register. */ + if ((set && !REG_P (SET_DEST (set)))) + continue; + /* Compute the number of reg_moves needed for u, by looking at life ranges started at u (excluding self-loops). */ for (e = u->out; e; e = e->next_out) @@ -493,6 +498,16 @@ generate_reg_moves (partial_schedule_ptr ps, bool rescan) && SCHED_COLUMN (e->dest) < SCHED_COLUMN (e->src)) nreg_moves4e--; + if (nreg_moves4e >= 1) + { + /* !single_set instructions are not supported yet and + thus we do not except to encounter them in the loop + except from the doloop part. For the latter case + we assume no regmoves are generated as the doloop + instructions are tied to the branch with an edge. */ + gcc_assert (set); + } + nreg_moves = MAX (nreg_moves, nreg_moves4e); }