Update mlkem_native.c and mlkem_native.S

Signed-off-by: Hanno Becker <beckphan@amazon.co.uk>

Author: hanno-becker

mlkem/mlkem_native.S

@@ -85,6 +85,12 @@
 #include "mlkem/src/native/x86_64/src/rej_uniform_asm.S"
 #include "mlkem/src/native/x86_64/src/tomont.S"
 #endif /* MLK_SYS_X86_64 */
+#if defined(MLK_SYS_PPC64LE)
+#include "mlkem/src/native/ppc64le/src/intt_ppc.S"
+#include "mlkem/src/native/ppc64le/src/ntt_ppc.S"
+#include "mlkem/src/native/ppc64le/src/poly_tomont.S"
+#include "mlkem/src/native/ppc64le/src/reduce.S"
+#endif /* MLK_SYS_PPC64LE */
 #endif /* MLK_CONFIG_USE_NATIVE_BACKEND_ARITH */
 
 #if defined(MLK_CONFIG_USE_NATIVE_BACKEND_FIPS202)

scripts/autogen

@@ -1220,6 +1220,10 @@ def x86_64(c):
     return "/x86_64/" in c
 
 
+def ppc64le(c):
+    return "/ppc64le/" in c
+
+
 def native_fips202(c):
     return native(c) and fips202(c)
 
@@ -1252,6 +1256,10 @@ def native_arith_x86_64(c):
     return native_arith(c) and x86_64(c)
 
 
+def native_arith_ppc64le(c):
+    return native_arith(c) and ppc64le(c)
+
+
 def native_arith_core(c):
     return (
         native_arith(c) and not native_arith_x86_64(c) and not native_arith_aarch64(c)
@@ -1515,6 +1523,10 @@ def gen_monolithic_asm_file(dry_run=False):
         for c in filter(native_arith_x86_64, asm_sources):
             yield f'#include "{c}"'
         yield "#endif"
+        yield "#if defined(MLK_SYS_PPC64LE)"
+        for c in filter(native_arith_ppc64le, asm_sources):
+            yield f'#include "{c}"'
+        yield "#endif"
         yield "#endif"
         yield ""
         yield "#if defined(MLK_CONFIG_USE_NATIVE_BACKEND_FIPS202)"