[4.8] Add -mlong-double-128 and make it default for 64-bit Bionic

Backport of r207428:

2014-02-03  H.J. Lu  <hongjiu.lu@intel.com>

    gcc/

    	* config/i386/i386.c (flag_opts): Add -mlong-double-128.
    	(ix86_option_override_internal): Default long double to 64-bit for
    	32-bit Bionic and to 128-bit for 64-bit Bionic.

    	* config/i386/i386.h (LONG_DOUBLE_TYPE_SIZE): Use 128 if
    	TARGET_LONG_DOUBLE_128 is true.
    	(LIBGCC2_LONG_DOUBLE_TYPE_SIZE): Likewise.

    	* config/i386/i386.opt (mlong-double-80): Negate -mlong-double-64.
    	(mlong-double-64): Negate -mlong-double-128.
    	(mlong-double-128): New option.

    	* config/i386/i386-c.c (ix86_target_macros): Define
    	__LONG_DOUBLE_128__ for TARGET_LONG_DOUBLE_128.

    	* doc/invoke.texi: Document -mlong-double-128.

    gcc/testsuite/

    	* gcc.target/i386/long-double-64-1.c: Verify __multf3 isn't used.
    	* gcc.target/i386/long-double-64-4.c: Likewise.
    	* gcc.target/i386/long-double-80-1.c: Likewise.
    	* gcc.target/i386/long-double-80-2.c: Likewise.
    	* gcc.target/i386/long-double-80-3.c: Likewise.
    	* gcc.target/i386/long-double-80-4.c: Likewise.
    	* gcc.target/i386/long-double-80-5.c: Likewise.
    	* gcc.target/i386/long-double-64-2.c: Limit to ia32.  Verify
    	__multf3 isn't used.
    	* gcc.target/i386/long-double-64-3.c: Likewise.
    	* gcc.target/i386/long-double-128-1.c: New test.
    	* gcc.target/i386/long-double-128-2.c: Likewise.
    	* gcc.target/i386/long-double-128-3.c: Likewise.
    	* gcc.target/i386/long-double-128-4.c: Likewise.
    	* gcc.target/i386/long-double-128-5.c: Likewise.
    	* gcc.target/i386/long-double-128-6.c: Likewise.
    	* gcc.target/i386/long-double-128-7.c: Likewise.
    	* gcc.target/i386/long-double-128-8.c: Likewise.
    	* gcc.target/i386/long-double-128-9.c: Likewise.
    	* gcc.target/i386/long-double-64-5.c: Likewise.
    	* gcc.target/i386/long-double-64-6.c: Likewise.
    	* gcc.target/i386/long-double-64-7.c: Likewise.
    	* gcc.target/i386/long-double-64-8.c: Likewise.
    	* gcc.target/i386/long-double-64-9.c: Likewise.
    	* gcc.target/i386/long-double-80-10.c: Likewise.
    	* gcc.target/i386/long-double-80-8.c: Likewise.
    	* gcc.target/i386/long-double-80-9.c: Likewise.

Change-Id: I2e1ce44792dd78df521fa485f2c0d2303dbb83bd
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>

4 files changed, 26 insertions, 6 deletions

diff --git a/gcc-4.8/gcc/config/i386/i386-c.c b/gcc-4.8/gcc/config/i386/i386-c.c
index ef1e1eb3c..932e3d2eb 100644
--- a/gcc-4.8/gcc/config/i386/i386-c.c
+++ b/gcc-4.8/gcc/config/i386/i386-c.c
@@ -458,6 +458,9 @@ ix86_target_macros (void)
   if (TARGET_LONG_DOUBLE_64)
     cpp_define (parse_in, "__LONG_DOUBLE_64__");
 
+  if (TARGET_LONG_DOUBLE_128)
+    cpp_define (parse_in, "__LONG_DOUBLE_128__");
+
   cpp_define_formatted (parse_in, "__ATOMIC_HLE_ACQUIRE=%d", IX86_HLE_ACQUIRE);
   cpp_define_formatted (parse_in, "__ATOMIC_HLE_RELEASE=%d", IX86_HLE_RELEASE);
 
diff --git a/gcc-4.8/gcc/config/i386/i386.c b/gcc-4.8/gcc/config/i386/i386.c
index ddc76a558..fed91164d 100644
--- a/gcc-4.8/gcc/config/i386/i386.c
+++ b/gcc-4.8/gcc/config/i386/i386.c
@@ -2674,6 +2674,7 @@ ix86_target_string (HOST_WIDE_INT isa, int flags, const char *arch,
   static struct ix86_target_opts flag_opts[] =
   {
     { "-m128bit-long-double",		MASK_128BIT_LONG_DOUBLE },
+    { "-mlong-double-128",		MASK_LONG_DOUBLE_128 },
     { "-mlong-double-64",		MASK_LONG_DOUBLE_64 },
     { "-m80387",			MASK_80387 },
     { "-maccumulate-outgoing-args",	MASK_ACCUMULATE_OUTGOING_ARGS },
@@ -4006,10 +4007,19 @@ ix86_option_override_internal (bool main_args_p)
   else if (target_flags_explicit & MASK_RECIP)
     recip_mask &= ~(RECIP_MASK_ALL & ~recip_mask_explicit);
 
-  /* Default long double to 64-bit for Bionic.  */
+  /* Default long double to 64-bit for 32-bit Bionic and to __float128
+     for 64-bit Bionic.  */
   if (TARGET_HAS_BIONIC
-      && !(target_flags_explicit & MASK_LONG_DOUBLE_64))
-    target_flags |= MASK_LONG_DOUBLE_64;
+      && !(target_flags_explicit
+	   & (MASK_LONG_DOUBLE_64 | MASK_LONG_DOUBLE_128)))
+    target_flags |= (TARGET_64BIT
+			     ? MASK_LONG_DOUBLE_128
+			     : MASK_LONG_DOUBLE_64);
+
+  if ((target_flags & MASK_LONG_DOUBLE_128))
+    target_flags &= ~MASK_LONG_DOUBLE_64;
+  else if ((target_flags & MASK_LONG_DOUBLE_64))
+    target_flags &= ~MASK_LONG_DOUBLE_128;
 
   /* Save the initial options in case the user does function specific
      options.  */
diff --git a/gcc-4.8/gcc/config/i386/i386.h b/gcc-4.8/gcc/config/i386/i386.h
index 2a8e34c09..ead60937c 100644
--- a/gcc-4.8/gcc/config/i386/i386.h
+++ b/gcc-4.8/gcc/config/i386/i386.h
@@ -691,12 +691,15 @@ enum target_cpu_default
 #define LONG_LONG_TYPE_SIZE 64
 #define FLOAT_TYPE_SIZE 32
 #define DOUBLE_TYPE_SIZE 64
-#define LONG_DOUBLE_TYPE_SIZE (TARGET_LONG_DOUBLE_64 ? 64 : 80)
+#define LONG_DOUBLE_TYPE_SIZE \
+  (TARGET_LONG_DOUBLE_64 ? 64 : (TARGET_LONG_DOUBLE_128 ? 128 : 80))
 
 /* Define this to set long double type size to use in libgcc2.c, which can
    not depend on target_flags.  */
 #ifdef __LONG_DOUBLE_64__
 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
+#elif defined (__LONG_DOUBLE_128__)
+#define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 128
 #else
 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 80
 #endif
diff --git a/gcc-4.8/gcc/config/i386/i386.opt b/gcc-4.8/gcc/config/i386/i386.opt
index f5ad69e26..b13ca84ab 100644
--- a/gcc-4.8/gcc/config/i386/i386.opt
+++ b/gcc-4.8/gcc/config/i386/i386.opt
@@ -86,13 +86,17 @@ Target RejectNegative Report InverseMask(128BIT_LONG_DOUBLE) Save
 sizeof(long double) is 12
 
 mlong-double-80
-Target Report RejectNegative InverseMask(LONG_DOUBLE_64) Save
+Target Report RejectNegative Negative(mlong-double-64) InverseMask(LONG_DOUBLE_64) Save
 Use 80-bit long double
 
 mlong-double-64
-Target Report RejectNegative Mask(LONG_DOUBLE_64) Save
+Target Report RejectNegative Negative(mlong-double-128) Mask(LONG_DOUBLE_64) InverseMask(LONG_DOUBLE_128) Save
 Use 64-bit long double
 
+mlong-double-128
+Target Report RejectNegative Negative(mlong-double-80) Mask(LONG_DOUBLE_128) InverseMask(LONG_DOUBLE_64) Save
+Use 128-bit long double
+
 maccumulate-outgoing-args
 Target Report Mask(ACCUMULATE_OUTGOING_ARGS) Save
 Reserve space for outgoing arguments in the function prologue