From: Ilya Enkovich <enkovich.gnu@gmail.com>
Date: Thu, 15 Oct 2015 09:26:39 +0000 (+0000)
Subject: re PR other/66887 (trunk/libmpx/mpxrt/mpxrt.c:158: possible performance problem)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=269ca76f4b95b196558ee8b93828a722ee395196;p=gcc.git

re PR other/66887 (trunk/libmpx/mpxrt/mpxrt.c:158: possible performance problem)

libmpx/

	PR other/66887
	* mpxrt/mpxrt.c (read_mpx_status_sig): Remove useless code.

From-SVN: r228838
---

diff --git a/libmpx/ChangeLog b/libmpx/ChangeLog
index 450b7d36e8c..5e5f77d68a7 100644
--- a/libmpx/ChangeLog
+++ b/libmpx/ChangeLog
@@ -1,3 +1,8 @@
+2015-10-15  Ilya Enkovich  <enkovich.gnu@gmail.com>
+
+	PR other/66887
+	* mpxrt/mpxrt.c (read_mpx_status_sig): Remove useless code.
+
 2015-07-16  Ilya Enkovich  <enkovich.gnu@gmail.com>
 
 	* configure.ac: Remove link_mpx.
diff --git a/libmpx/mpxrt/mpxrt.c b/libmpx/mpxrt/mpxrt.c
index 0eff87e7cc6..c29c5d9a501 100644
--- a/libmpx/mpxrt/mpxrt.c
+++ b/libmpx/mpxrt/mpxrt.c
@@ -152,13 +152,8 @@ xgetbv (uint32_t index)
 static uint64_t
 read_mpx_status_sig (ucontext_t *uctxt)
 {
-  uint8_t __attribute__ ((__aligned__ (64))) buffer[4096];
-  struct xsave_struct *xsave_buf = (struct xsave_struct *)buffer;
-
-  memset (buffer, 0, sizeof (buffer));
-  memcpy (buffer,
-	  (uint8_t *)uctxt->uc_mcontext.fpregs + XSAVE_OFFSET_IN_FPMEM,
-	  sizeof (struct xsave_struct));
+  uint8_t *regs = (uint8_t *)uctxt->uc_mcontext.fpregs + XSAVE_OFFSET_IN_FPMEM;
+  struct xsave_struct *xsave_buf = (struct xsave_struct *)regs;
   return xsave_buf->bndcsr.status_reg;
 }