From f310ad015b87353cad60b4a6d6f74e20267a5612 Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Fri, 12 Jun 2015 13:54:43 +0200 Subject: [PATCH] backport: re PR target/62642 (x86 rdtsc is moved through barrier) Backported from mainline 2014-12-15 Vladimir Makarov PR target/62642 * ira.c (rtx_moveable_p): Prevent UNSPEC_VOLATILE moves. From-SVN: r224420 --- gcc/ChangeLog | 8 ++++++++ gcc/ira.c | 6 ++++++ 2 files changed, 14 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 971906297dcb..be2c3a9f590c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,11 @@ +2015-06-12 Jakub Jelinek + + Backported from mainline + 2014-12-15 Vladimir Makarov + + PR target/62642 + * ira.c (rtx_moveable_p): Prevent UNSPEC_VOLATILE moves. + 2015-06-12 Jakub Jelinek PR middle-end/63608 diff --git a/gcc/ira.c b/gcc/ira.c index 0c703c514ca0..fb0650e59ecd 100644 --- a/gcc/ira.c +++ b/gcc/ira.c @@ -4434,6 +4434,12 @@ 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; } -- 2.47.2