Add support for POWER8/VSX

Add ppc, ppc64 and ppc64le on all_platforms and ARCH_LIST

Add VSX flags and check for -mvsx

Define empty setup_rtcd_internal

Add Altivec detection based on:
http://freevec.org/function/altivec_runtime_detection_linux

Detect VSX at runtime when enabled

Change-Id: I304f4d8c5fee0ff19b6483cd2e9cc50d6ddec472
Signed-off-by: Rafael de Lucena Valle <rafaeldelucena@gmail.com>

3 files changed, 49 insertions, 0 deletions

diff --git a/build/make/Makefile b/build/make/Makefile
index cba605786..0d29609ff 100644
--- a/build/make/Makefile
+++ b/build/make/Makefile
@@ -124,6 +124,7 @@ ifeq ($(TOOLCHAIN), x86-os2-gcc)
 CFLAGS += -mstackrealign
 endif
 
+# x86[_64]
 $(BUILD_PFX)%_mmx.c.d: CFLAGS += -mmmx
 $(BUILD_PFX)%_mmx.c.o: CFLAGS += -mmmx
 $(BUILD_PFX)%_sse2.c.d: CFLAGS += -msse2
@@ -139,6 +140,10 @@ $(BUILD_PFX)%_avx.c.o: CFLAGS += -mavx
 $(BUILD_PFX)%_avx2.c.d: CFLAGS += -mavx2
 $(BUILD_PFX)%_avx2.c.o: CFLAGS += -mavx2
 
+# POWER
+$(BUILD_PFX)%_vsx.c.d: CFLAGS += -mvsx
+$(BUILD_PFX)%_vsx.c.o: CFLAGS += -mvsx
+
 $(BUILD_PFX)%.c.d: %.c
 	$(if $(quiet),@echo "    [DEP] $@")
 	$(qexec)mkdir -p $(dir $@)
diff --git a/build/make/configure.sh b/build/make/configure.sh
index ac60f5082..dcfdfe1d2 100644
--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -697,6 +697,9 @@ process_common_toolchain() {
       *sparc*)
         tgt_isa=sparc
         ;;
+      power*)
+        tgt_isa=ppc
+        ;;
     esac
 
     # detect tgt_os
@@ -782,6 +785,9 @@ process_common_toolchain() {
     mips*)
       enable_feature mips
       ;;
+    ppc*)
+      enable_feature ppc
+      ;;
   esac
 
   # PIC is probably what we want when building shared libs
@@ -1159,6 +1165,11 @@ EOF
       check_add_asflags -march=${tgt_isa}
       check_add_asflags -KPIC
       ;;
+    ppc*)
+      link_with_cc=gcc
+      setup_gnu_toolchain
+      check_gcc_machine_option "vsx"
+      ;;
     x86*)
       case  ${tgt_os} in
         win*)
diff --git a/build/make/rtcd.pl b/build/make/rtcd.pl
index 9e746c46d..58700895f 100755
--- a/build/make/rtcd.pl
+++ b/build/make/rtcd.pl
@@ -335,6 +335,36 @@ EOF
   common_bottom;
 }
 
+sub ppc() {
+  determine_indirection("c", @ALL_ARCHS);
+
+  # Assign the helper variable for each enabled extension
+  foreach my $opt (@ALL_ARCHS) {
+    my $opt_uc = uc $opt;
+    eval "\$have_${opt}=\"flags & HAS_${opt_uc}\"";
+  }
+
+  common_top;
+  print <<EOF;
+#include "vpx_config.h"
+
+#ifdef RTCD_C
+#include "vpx_ports/ppc.h"
+static void setup_rtcd_internal(void)
+{
+    int flags = ppc_simd_caps();
+    (void)flags;
+EOF
+
+  set_function_pointers("c", @ALL_ARCHS);
+
+  print <<EOF;
+}
+#endif
+EOF
+  common_bottom;
+}
+
 sub unoptimized() {
   determine_indirection "c";
   common_top;
@@ -390,6 +420,9 @@ if ($opts{arch} eq 'x86') {
 } elsif ($opts{arch} eq 'armv8' || $opts{arch} eq 'arm64' ) {
   @ALL_ARCHS = filter(qw/neon/);
   arm;
+} elsif ($opts{arch} eq 'ppc' ) {
+  @ALL_ARCHS = filter(qw/vsx/);
+  ppc;
 } else {
   unoptimized;
 }