float128-sed: New files to convert TF names to KF names for PowerPC IEEE 128-bit floating...

2016-01-21  Michael Meissner  <meissner@linux.vnet.ibm.com>
	    Steven Munroe <munroesj@linux.vnet.ibm.com>
	    Tulio Magno Quites Machado Filho <tulioqm@br.ibm.com>

	* config/rs6000/float128-sed: New files to convert TF names to KF
	names for PowerPC IEEE 128-bit floating point support.
	* config/rs6000/float128-sed-hw: Likewise.

	* config/rs6000/float128-hw.c: New file for ISA 3.0 IEEE 128-bit
	floating point hardware support.

	* config/rs6000/float128-ifunc.c: New file to pick either IEEE
	128-bit floating point software emulation or use ISA 3.0 hardware
	support if it is available.

	* config/rs6000/quad-float128.h: New file to support IEEE 128-bit
	floating point.

	* config/rs6000/extendkftf2-sw.c: New file, convert IEEE 128-bit
	floating point to IBM extended double.

	* config/rs6000/trunctfkf2-sw.c: New file, convert IBM extended
	double to IEEE 128-bit floating point.

	* config/rs6000/t-float128: New Makefile fragments to enable
	building __float128 emulation support.
	* config/rs6000/t-float128-hw: Likewise.

	* config/rs6000/sfp-exceptions.c: New file to provide exception
	support for IEEE 128-bit floating point.

	* config/rs6000/floattikf.c: New files for converting between IEEE
	128-bit floating point and signed/unsigned 128-bit integers.
	* config/rs6000/fixunskfti.c: Likewise.
	* config/rs6000/fixkfti.c: Likewise.
	* config/rs6000/floatuntikf.c: Likewise.

	* config/rs6000/sfp-machine.h (_FP_W_TYPE_SIZE): Use 64-bit types
	when building on 64-bit systems, or when VSX is enabled.
	(_FP_W_TYPE): Likewise.
	(_FP_WS_TYPE): Likewise.
	(_FP_I_TYPE): Likewise.
	(TItype): Define on 64-bit systems.
	(UTItype): Likewise.
	(TI_BITS): Likewise.
	(_FP_MUL_MEAT_D): Add support for using 64-bit types.
	(_FP_MUL_MEAT_Q): Likewise.
	(_FP_DIV_MEAT_D): Likewise.
	(_FP_DIV_MEAT_Q): Likewise.
	(_FP_NANFRAC_D): Likewise.
	(_FP_NANFRAC_Q): Likewise.
	(ISA_BIT): Add exception support if we are being compiled on a
	machine with hardware floating point support to build the IEEE
	128-bit emulation functions.
	(FP_EX_INVALID): Likewise.
	(FP_EX_OVERFLOW): Likewise.
	(FP_EX_UNDERFLOW): Likewise.
	(FP_EX_DIVZERO): Likewise.
	(FP_EX_INEXACT): Likewise.
	(FP_EX_ALL): Likewise.
	(__sfp_handle_exceptions): Likewise.
	(FP_HANDLE_EXCEPTIONS): Likewise.
	(FP_RND_NEAREST): Likewise.
	(FP_RND_ZERO): Likewise.
	(FP_RND_PINF): Likewise.
	(FP_RND_MINF): Likewise.
	(FP_RND_MASK): Likewise.
	(_FP_DECL_EX): Likewise.
	(FP_INIT_ROUNDMODE): Likewise.
	(FP_ROUNDMODE): Likewise.

	* libgcc/config.host (powerpc*-*-linux*): If compiler can compile
	VSX code, enable IEEE 128-bit floating point.  If the compiler can
	compile IEEE 128-bit floating point code with ISA 3.0 IEEE 128-bit
	floating point hardware instructions and it supports declaring
	functions with the ifunc attribute, enable ifunc functions to
	switch between software and hardware support.
	* configure.ac (powerpc*-*-linux*): Likewise.
	* configure: Regenerate.



Co-Authored-By: Steven Munroe <munroesj@linux.vnet.ibm.com>
Co-Authored-By: Tulio Magno Quites Machado Filho <tulioqm@br.ibm.com>

From-SVN: r232685

1 files changed, 31 insertions, 0 deletions

diff --git a/libgcc/configure.ac b/libgcc/configure.ac
index 9d831a76997..860a5f58100 100644
--- a/libgcc/configure.ac
+++ b/libgcc/configure.ac
@@ -373,6 +373,37 @@ esac
 ;;
 esac
 
+case ${host} in
+powerpc*-*-linux*)
+  AC_CACHE_CHECK([whether the PowerPC compiler can do __float128],
+		 [libgcc_cv_powerpc_float128],
+		 [AC_COMPILE_IFELSE(
+    [#pragma GCC target ("vsx,float128")
+     __float128 add (__float128 *a) { return *a + *(a+1); }],
+    [libgcc_cv_powerpc_float128=yes],
+    [libgcc_cv_powerpc_float128=no])])
+
+  AC_CACHE_CHECK([whether the PowerPC compiler can do hardware __float128],
+		 [libgcc_cv_powerpc_float128_hw],
+		 [AC_COMPILE_IFELSE(
+    [#pragma GCC target ("cpu=power9,float128,float128-hardware")
+     #include <sys/auxv.h>
+     #ifndef AT_PLATFORM
+     #error "AT_PLATFORM is not defined"
+     #endif
+     __float128 add (__float128 a, __float128 b)
+     {
+       __float128 ret;
+       __asm__ ("xsaddqp %0,%1,%2" : "=v" (ret) : "v" (a), "v" (b));
+       return ret;
+     }
+     void *add_resolver (void) { return (void *) add; }
+     __float128 add_ifunc (__float128, __float128)
+	__attribute__ ((__ifunc__ ("add_resolver")));],
+    [libgcc_cv_powerpc_float128_hw=yes],
+    [libgcc_cv_powerpc_float128_hw=no])])
+esac
+
 # Collect host-machine-specific information.
 . ${srcdir}/config.host