From: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
Date: Wed, 5 Oct 2016 14:57:14 +0000 (+0000)
Subject: [fold-const] Fix native_encode_real for HFmode constants
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=37a1d58a10eb8b176c8fac2a25bd8ca8cba0a91e;p=gcc.git

[fold-const] Fix native_encode_real for HFmode constants

	* fold-const.c (native_encode_real): Fix logic for selecting offset
	to write to when BYTES_BIG_ENDIAN.

From-SVN: r240791
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 81e4235d2e4..6b4dc9cd145 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2016-10-05  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* fold-const.c (native_encode_real): Fix logic for selecting offset
+	to write to when BYTES_BIG_ENDIAN.
+
 2016-10-05  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	* builtins.c (fold_builtin_strchr): Remove function.
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index a6b7ec7dfec..65c75f63931 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -7142,7 +7142,16 @@ native_encode_real (const_tree expr, unsigned char *ptr, int len, int off)
 	    offset += byte % UNITS_PER_WORD;
 	}
       else
-	offset = BYTES_BIG_ENDIAN ? 3 - byte : byte;
+	{
+	  offset = byte;
+	  if (BYTES_BIG_ENDIAN)
+	    {
+	      /* Reverse bytes within each long, or within the entire float
+		 if it's smaller than a long (for HFmode).  */
+	      offset = MIN (3, total_bytes - 1) - offset;
+	      gcc_assert (offset >= 0);
+	    }
+	}
       offset = offset + ((bitpos / BITS_PER_UNIT) & ~3);
       if (offset >= off
 	  && offset - off < len)