backport: arm.c (arm_libcall_uses_aapcs_base): Use correct ABI for double-precision...

	Backport from mainline.
	2011-06-08  Julian Brown  <julian@codesourcery.com>

	* config/arm/arm.c (arm_libcall_uses_aapcs_base): Use correct ABI
	for double-precision helper functions in hard-float mode if only
	single-precision arithmetic is supported in hardware.

From-SVN: r184194

diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 54b7603f3fc08e9e35eae31452f08e4e5a2a756d..49c2a75bdbc5dd1dfbf8a10088fac658add57247 100644 (file)
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -3581,6 +3581,28 @@ arm_libcall_uses_aapcs_base (const_rtx libcall)
                   convert_optab_libfunc (sfix_optab, DImode, SFmode));
       add_libcall (libcall_htab,
                   convert_optab_libfunc (ufix_optab, DImode, SFmode));
+
+      /* Values from double-precision helper functions are returned in core
+        registers if the selected core only supports single-precision
+        arithmetic, even if we are using the hard-float ABI.  The same is
+        true for single-precision helpers, but we will never be using the
+        hard-float ABI on a CPU which doesn't support single-precision
+        operations in hardware.  */
+      add_libcall (libcall_htab, optab_libfunc (add_optab, DFmode));
+      add_libcall (libcall_htab, optab_libfunc (sdiv_optab, DFmode));
+      add_libcall (libcall_htab, optab_libfunc (smul_optab, DFmode));
+      add_libcall (libcall_htab, optab_libfunc (neg_optab, DFmode));
+      add_libcall (libcall_htab, optab_libfunc (sub_optab, DFmode));
+      add_libcall (libcall_htab, optab_libfunc (eq_optab, DFmode));
+      add_libcall (libcall_htab, optab_libfunc (lt_optab, DFmode));
+      add_libcall (libcall_htab, optab_libfunc (le_optab, DFmode));
+      add_libcall (libcall_htab, optab_libfunc (ge_optab, DFmode));
+      add_libcall (libcall_htab, optab_libfunc (gt_optab, DFmode));
+      add_libcall (libcall_htab, optab_libfunc (unord_optab, DFmode));
+      add_libcall (libcall_htab, convert_optab_libfunc (sext_optab, DFmode,
+                                                       SFmode));
+      add_libcall (libcall_htab, convert_optab_libfunc (trunc_optab, SFmode,
+                                                       DFmode));
     }
 
   return libcall && htab_find (libcall_htab, libcall) != NULL;