From d8c1674416836c4b4573172b541992ddd12df713 Mon Sep 17 00:00:00 2001 From: Vladimir Makarov Date: Mon, 15 Dec 2014 20:04:04 +0000 Subject: [PATCH] re PR target/62642 (x86 rdtsc is moved through barrier) 2014-12-15 Vladimir Makarov PR target/62642 * ira.c (rtx_moveable_p): Prevent UNSPEC_VOLATILE moves. From-SVN: r218761 --- gcc/ChangeLog | 7 ++++++- gcc/ira.c | 6 ++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 8276d646c5d..87ee0f9f475 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,9 +1,14 @@ +2014-12-15 Vladimir Makarov + + PR target/62642 + * ira.c (rtx_moveable_p): Prevent UNSPEC_VOLATILE moves. + 2014-12-15 Vladimir Makarov * ira-int.h (ira_prohibited_class_mode_regs): Remove. (struct target_ira_int): Move x_ira_prohibited_class_mode_regs to ... - * ira.h (struct target_ira_int): ... here. + * ira.h (struct target_ira): ... here. (ira_prohibited_class_mode_regs): Define. * lra-constraints.c (process_alt_operands): Add one more condition to refuse alternative when reload pseudo of given class can not diff --git a/gcc/ira.c b/gcc/ira.c index e610d358177..f08aa23e408 100644 --- a/gcc/ira.c +++ b/gcc/ira.c @@ -4358,6 +4358,12 @@ rtx_moveable_p (rtx *loc, enum op_type type) case CLOBBER: return rtx_moveable_p (&SET_DEST (x), OP_OUT); + case UNSPEC_VOLATILE: + /* It is a bad idea to consider insns with with such rtl + as moveable ones. The insn scheduler also considers them as barrier + for a reason. */ + return false; + default: break; } -- 2.30.2