From c51ec0a3d68c86ba9b2e2d0c61556fee8308d570 Mon Sep 17 00:00:00 2001 From: Andrew MacLeod Date: Wed, 8 Feb 2012 15:26:02 +0000 Subject: optabs.c (expand_atomic_load): Do not assume compare_and_swap will succeed for larger than word integers. * optabs.c (expand_atomic_load): Do not assume compare_and_swap will succeed for larger than word integers. From-SVN: r184009 --- gcc/optabs.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'gcc/optabs.c') diff --git a/gcc/optabs.c b/gcc/optabs.c index 87cce8e..b0ecdf0 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -7665,9 +7665,12 @@ expand_atomic_load (rtx target, rtx mem, enum memmodel model) /* Issue val = compare_and_swap (mem, 0, 0). This may cause the occasional harmless store of 0 when the value is already 0, but it seems to be OK according to the standards guys. */ - expand_atomic_compare_and_swap (NULL, &target, mem, const0_rtx, - const0_rtx, false, model, model); - return target; + if (expand_atomic_compare_and_swap (NULL, &target, mem, const0_rtx, + const0_rtx, false, model, model)) + return target; + else + /* Otherwise there is no atomic load, leave the library call. */ + return NULL_RTX; } /* Otherwise assume loads are atomic, and emit the proper barriers. */ -- cgit v1.1