re PR middle-end/39986 (decimal float constant is incorrect when cc1 is a 64-bit binary)

	PR middle-end/39986
	* dfp.c (encode_decimal32, decode_decimal32, encode_decimal64,
	decode_decimal64, encode_decimal128, decode_decimal128): Avoid
	32-bit memcpy into long.

	* gcc.dg/dfp/pr39986.c: New test.

From-SVN: r147188

1 files changed, 58 insertions, 26 deletions

diff --git a/gcc/dfp.c b/gcc/dfp.c
index 875e8c4..5e1dbcc 100644
--- a/gcc/dfp.c
+++ b/gcc/dfp.c
@@ -133,6 +133,7 @@ encode_decimal32 (const struct real_format *fmt ATTRIBUTE_UNUSED,
   decNumber dn;
   decimal32 d32;
   decContext set;
+  int32_t image;
 
   decContextDefault (&set, DEC_INIT_DECIMAL128);
   set.traps = 0;
@@ -140,7 +141,8 @@ encode_decimal32 (const struct real_format *fmt ATTRIBUTE_UNUSED,
   decimal_to_decnumber (r, &dn); 
   decimal32FromNumber (&d32, &dn, &set);
 
-  memcpy (&buf[0], d32.bytes, sizeof (uint32_t));
+  memcpy (&image, d32.bytes, sizeof (int32_t));
+  buf[0] = image;
 }
 
 /* Decode an IEEE 754 decimal32 type into a real.  */
@@ -152,11 +154,13 @@ decode_decimal32 (const struct real_format *fmt ATTRIBUTE_UNUSED,
   decNumber dn;
   decimal32 d32;
   decContext set;
+  int32_t image;
 
   decContextDefault (&set, DEC_INIT_DECIMAL128);
   set.traps = 0;
 
-  memcpy (&d32.bytes, &buf[0], sizeof (uint32_t));
+  image = buf[0];
+  memcpy (&d32.bytes, &image, sizeof (int32_t));
 
   decimal32ToNumber (&d32, &dn);
   decimal_from_decnumber (r, &dn, &set); 
@@ -171,6 +175,7 @@ encode_decimal64 (const struct real_format *fmt ATTRIBUTE_UNUSED,
   decNumber dn;
   decimal64 d64;
   decContext set;
+  int32_t image;
 
   decContextDefault (&set, DEC_INIT_DECIMAL128);
   set.traps = 0;
@@ -180,13 +185,17 @@ encode_decimal64 (const struct real_format *fmt ATTRIBUTE_UNUSED,
 
   if (WORDS_BIGENDIAN == FLOAT_WORDS_BIG_ENDIAN)
     {
-      memcpy (&buf[0], &d64.bytes[0], sizeof (uint32_t));
-      memcpy (&buf[1], &d64.bytes[4], sizeof (uint32_t));
+      memcpy (&image, &d64.bytes[0], sizeof (int32_t));
+      buf[0] = image;
+      memcpy (&image, &d64.bytes[4], sizeof (int32_t));
+      buf[1] = image;
     }
   else
     {
-      memcpy (&buf[0], &d64.bytes[4], sizeof (uint32_t));
-      memcpy (&buf[1], &d64.bytes[0], sizeof (uint32_t));
+      memcpy (&image, &d64.bytes[4], sizeof (int32_t));
+      buf[0] = image;
+      memcpy (&image, &d64.bytes[0], sizeof (int32_t));
+      buf[1] = image;
     }
 }
 
@@ -199,19 +208,24 @@ decode_decimal64 (const struct real_format *fmt ATTRIBUTE_UNUSED,
   decNumber dn;
   decimal64 d64;
   decContext set;
+  int32_t image;
 
   decContextDefault (&set, DEC_INIT_DECIMAL128);
   set.traps = 0;
 
   if (WORDS_BIGENDIAN == FLOAT_WORDS_BIG_ENDIAN)
     {
-      memcpy (&d64.bytes[0], &buf[0], sizeof (uint32_t));
-      memcpy (&d64.bytes[4], &buf[1], sizeof (uint32_t));
+      image = buf[0];
+      memcpy (&d64.bytes[0], &image, sizeof (int32_t));
+      image = buf[1];
+      memcpy (&d64.bytes[4], &image, sizeof (int32_t));
     }
   else
     {
-      memcpy (&d64.bytes[0], &buf[1], sizeof (uint32_t));
-      memcpy (&d64.bytes[4], &buf[0], sizeof (uint32_t));
+      image = buf[1];
+      memcpy (&d64.bytes[0], &image, sizeof (int32_t));
+      image = buf[0];
+      memcpy (&d64.bytes[4], &image, sizeof (int32_t));
     }
 
   decimal64ToNumber (&d64, &dn);
@@ -227,6 +241,7 @@ encode_decimal128 (const struct real_format *fmt ATTRIBUTE_UNUSED,
   decNumber dn;
   decContext set;
   decimal128 d128;
+  int32_t image;
 
   decContextDefault (&set, DEC_INIT_DECIMAL128);
   set.traps = 0;
@@ -236,17 +251,25 @@ encode_decimal128 (const struct real_format *fmt ATTRIBUTE_UNUSED,
 
   if (WORDS_BIGENDIAN == FLOAT_WORDS_BIG_ENDIAN)
     {
-      memcpy (&buf[0], &d128.bytes[0], sizeof (uint32_t));
-      memcpy (&buf[1], &d128.bytes[4], sizeof (uint32_t));
-      memcpy (&buf[2], &d128.bytes[8], sizeof (uint32_t));
-      memcpy (&buf[3], &d128.bytes[12], sizeof (uint32_t));
+      memcpy (&image, &d128.bytes[0], sizeof (int32_t));
+      buf[0] = image;
+      memcpy (&image, &d128.bytes[4], sizeof (int32_t));
+      buf[1] = image;
+      memcpy (&image, &d128.bytes[8], sizeof (int32_t));
+      buf[2] = image;
+      memcpy (&image, &d128.bytes[12], sizeof (int32_t));
+      buf[3] = image;
     }
   else
     {
-      memcpy (&buf[0], &d128.bytes[12], sizeof (uint32_t));
-      memcpy (&buf[1], &d128.bytes[8], sizeof (uint32_t));
-      memcpy (&buf[2], &d128.bytes[4], sizeof (uint32_t));
-      memcpy (&buf[3], &d128.bytes[0], sizeof (uint32_t));
+      memcpy (&image, &d128.bytes[12], sizeof (int32_t));
+      buf[0] = image;
+      memcpy (&image, &d128.bytes[8], sizeof (int32_t));
+      buf[1] = image;
+      memcpy (&image, &d128.bytes[4], sizeof (int32_t));
+      buf[2] = image;
+      memcpy (&image, &d128.bytes[0], sizeof (int32_t));
+      buf[3] = image;
     }
 }
 
@@ -259,23 +282,32 @@ decode_decimal128 (const struct real_format *fmt ATTRIBUTE_UNUSED,
   decNumber dn;
   decimal128 d128;
   decContext set;
+  int32_t image;
 
   decContextDefault (&set, DEC_INIT_DECIMAL128);
   set.traps = 0;
 
   if (WORDS_BIGENDIAN == FLOAT_WORDS_BIG_ENDIAN)
     {
-      memcpy (&d128.bytes[0],  &buf[0], sizeof (uint32_t));
-      memcpy (&d128.bytes[4],  &buf[1], sizeof (uint32_t));
-      memcpy (&d128.bytes[8],  &buf[2], sizeof (uint32_t));
-      memcpy (&d128.bytes[12], &buf[3], sizeof (uint32_t));
+      image = buf[0];
+      memcpy (&d128.bytes[0],  &image, sizeof (int32_t));
+      image = buf[1];
+      memcpy (&d128.bytes[4],  &image, sizeof (int32_t));
+      image = buf[2];
+      memcpy (&d128.bytes[8],  &image, sizeof (int32_t));
+      image = buf[3];
+      memcpy (&d128.bytes[12], &image, sizeof (int32_t));
     }
   else
     {
-      memcpy (&d128.bytes[0],  &buf[3], sizeof (uint32_t));
-      memcpy (&d128.bytes[4],  &buf[2], sizeof (uint32_t));
-      memcpy (&d128.bytes[8],  &buf[1], sizeof (uint32_t));
-      memcpy (&d128.bytes[12], &buf[0], sizeof (uint32_t));
+      image = buf[3];
+      memcpy (&d128.bytes[0],  &image, sizeof (int32_t));
+      image = buf[2];
+      memcpy (&d128.bytes[4],  &image, sizeof (int32_t));
+      image = buf[1];
+      memcpy (&d128.bytes[8],  &image, sizeof (int32_t));
+      image = buf[0];
+      memcpy (&d128.bytes[12], &image, sizeof (int32_t));
     }
 
   decimal128ToNumber (&d128, &dn);