diff --git a/libc/arch-x86/atom/atom.mk b/libc/arch-x86/atom/atom.mk
index 3f28fb2..1afabac 100644
--- a/libc/arch-x86/atom/atom.mk
+++ b/libc/arch-x86/atom/atom.mk
@@ -1,32 +1,27 @@
 libc_bionic_src_files_x86 += \
     arch-x86/atom/string/sse2-bzero-atom.S \
-    arch-x86/atom/string/sse2-memchr-atom.S \
-    arch-x86/atom/string/sse2-memrchr-atom.S \
     arch-x86/atom/string/sse2-memset-atom.S \
-    arch-x86/atom/string/sse2-strchr-atom.S \
     arch-x86/atom/string/sse2-strlen-atom.S \
-    arch-x86/atom/string/sse2-strnlen-atom.S \
-    arch-x86/atom/string/sse2-strrchr-atom.S \
-    arch-x86/atom/string/sse2-wcschr-atom.S \
-    arch-x86/atom/string/sse2-wcsrchr-atom.S \
-    arch-x86/atom/string/sse2-wcslen-atom.S \
-    arch-x86/atom/string/sse2-wcscmp-atom.S \
     arch-x86/atom/string/ssse3-bcopy-atom.S \
     arch-x86/atom/string/ssse3-memcmp-atom.S \
     arch-x86/atom/string/ssse3-memcpy-atom.S \
     arch-x86/atom/string/ssse3-memmove-atom.S \
-    arch-x86/atom/string/ssse3-strcat-atom.S \
-    arch-x86/atom/string/ssse3-strcmp-atom.S \
     arch-x86/atom/string/ssse3-strcpy-atom.S \
-    arch-x86/atom/string/ssse3-strlcat-atom.S \
-    arch-x86/atom/string/ssse3-strlcpy-atom.S \
-    arch-x86/atom/string/ssse3-strncat-atom.S \
-    arch-x86/atom/string/ssse3-strncmp-atom.S \
     arch-x86/atom/string/ssse3-strncpy-atom.S \
-    arch-x86/atom/string/ssse3-wcscat-atom.S \
-    arch-x86/atom/string/ssse3-wcscpy-atom.S \
     arch-x86/atom/string/ssse3-wmemcmp-atom.S
 
-libc_bionic_src_files_x86 += \
-    arch-x86/silvermont/string/sse2-stpcpy-slm.S \
-    arch-x86/silvermont/string/sse2-stpncpy-slm.S
+libc_bionic_src_files_exclude_x86 += \
+    arch-x86/generic/string/memcmp.S \
+
+libc_bionic_src_files_exclude_x86 += \
+    arch-x86/silvermont/string/sse2-bcopy-slm.S \
+    arch-x86/silvermont/string/sse2-bzero-slm.S \
+    arch-x86/silvermont/string/sse2-memcpy-slm.S \
+    arch-x86/silvermont/string/sse2-memmove-slm.S \
+    arch-x86/silvermont/string/sse2-memset-slm.S \
+    arch-x86/silvermont/string/sse2-strcpy-slm.S \
+    arch-x86/silvermont/string/sse2-strlen-slm.S \
+    arch-x86/silvermont/string/sse2-strncpy-slm.S \
+
+libc_freebsd_src_files_exclude_x86 += \
+    upstream-freebsd/lib/libc/string/wmemcmp.c \
diff --git a/libc/arch-x86/generic/generic.mk b/libc/arch-x86/generic/generic.mk
deleted file mode 100644
index 4aee5dc..0000000
--- a/libc/arch-x86/generic/generic.mk
+++ /dev/null
@@ -1,52 +0,0 @@
-libc_bionic_src_files_x86 += \
-    arch-x86/atom/string/sse2-memchr-atom.S \
-    arch-x86/atom/string/sse2-memrchr-atom.S \
-    arch-x86/atom/string/sse2-strchr-atom.S \
-    arch-x86/atom/string/sse2-strnlen-atom.S \
-    arch-x86/atom/string/sse2-strrchr-atom.S \
-    arch-x86/atom/string/sse2-wcschr-atom.S \
-    arch-x86/atom/string/sse2-wcsrchr-atom.S \
-    arch-x86/atom/string/sse2-wcslen-atom.S \
-    arch-x86/atom/string/sse2-wcscmp-atom.S \
-    arch-x86/silvermont/string/sse2-bcopy-slm.S \
-    arch-x86/silvermont/string/sse2-bzero-slm.S \
-    arch-x86/silvermont/string/sse2-memcpy-slm.S \
-    arch-x86/silvermont/string/sse2-memmove-slm.S \
-    arch-x86/silvermont/string/sse2-memset-slm.S \
-    arch-x86/silvermont/string/sse2-stpcpy-slm.S \
-    arch-x86/silvermont/string/sse2-stpncpy-slm.S \
-    arch-x86/silvermont/string/sse2-strcpy-slm.S \
-    arch-x86/silvermont/string/sse2-strlen-slm.S \
-    arch-x86/silvermont/string/sse2-strncpy-slm.S
-
-ifeq ($(ARCH_X86_HAVE_SSSE3),true)
-libc_bionic_src_files_x86 += \
-    arch-x86/atom/string/ssse3-strncat-atom.S \
-    arch-x86/atom/string/ssse3-strlcat-atom.S \
-    arch-x86/atom/string/ssse3-strlcpy-atom.S \
-    arch-x86/atom/string/ssse3-strcmp-atom.S \
-    arch-x86/atom/string/ssse3-strncmp-atom.S \
-    arch-x86/atom/string/ssse3-strcat-atom.S \
-    arch-x86/atom/string/ssse3-wcscat-atom.S \
-    arch-x86/atom/string/ssse3-wcscpy-atom.S
-else
-libc_bionic_src_files_x86 += \
-    arch-x86/generic/string/strcmp.S \
-    arch-x86/generic/string/strncmp.S \
-    arch-x86/generic/string/strcat.S \
-    upstream-freebsd/lib/libc/string/wcscpy.c \
-    upstream-freebsd/lib/libc/string/wcscat.c \
-    upstream-openbsd/lib/libc/string/strlcat.c \
-    upstream-openbsd/lib/libc/string/strlcpy.c \
-    upstream-openbsd/lib/libc/string/strncat.c
-endif
-
-ifeq ($(ARCH_X86_HAVE_SSE4),true)
- libc_bionic_src_files_x86 += \
-    arch-x86/silvermont/string/sse4-memcmp-slm.S \
-    arch-x86/silvermont/string/sse4-wmemcmp-slm.S
-else
-libc_bionic_src_files_x86 += \
-    arch-x86/generic/string/memcmp.S \
-    upstream-freebsd/lib/libc/string/wmemcmp.c
-endif
diff --git a/libc/arch-x86/silvermont/silvermont.mk b/libc/arch-x86/silvermont/silvermont.mk
index 176bee3..e69de29 100644
--- a/libc/arch-x86/silvermont/silvermont.mk
+++ b/libc/arch-x86/silvermont/silvermont.mk
@@ -1,32 +0,0 @@
-libc_bionic_src_files_x86 += \
-    arch-x86/silvermont/string/sse2-bcopy-slm.S \
-    arch-x86/silvermont/string/sse2-bzero-slm.S \
-    arch-x86/silvermont/string/sse2-memcpy-slm.S \
-    arch-x86/silvermont/string/sse2-memmove-slm.S \
-    arch-x86/silvermont/string/sse2-memset-slm.S \
-    arch-x86/silvermont/string/sse2-stpcpy-slm.S \
-    arch-x86/silvermont/string/sse2-stpncpy-slm.S \
-    arch-x86/silvermont/string/sse2-strcpy-slm.S \
-    arch-x86/silvermont/string/sse2-strlen-slm.S \
-    arch-x86/silvermont/string/sse2-strncpy-slm.S \
-    arch-x86/silvermont/string/sse4-memcmp-slm.S \
-    arch-x86/silvermont/string/sse4-wmemcmp-slm.S
-
-libc_bionic_src_files_x86 += \
-    arch-x86/atom/string/sse2-memchr-atom.S \
-    arch-x86/atom/string/sse2-memrchr-atom.S \
-    arch-x86/atom/string/sse2-strchr-atom.S \
-    arch-x86/atom/string/sse2-strrchr-atom.S \
-    arch-x86/atom/string/sse2-strnlen-atom.S \
-    arch-x86/atom/string/sse2-wcschr-atom.S \
-    arch-x86/atom/string/sse2-wcsrchr-atom.S \
-    arch-x86/atom/string/sse2-wcslen-atom.S \
-    arch-x86/atom/string/sse2-wcscmp-atom.S \
-    arch-x86/atom/string/ssse3-strncat-atom.S \
-    arch-x86/atom/string/ssse3-strlcat-atom.S \
-    arch-x86/atom/string/ssse3-strlcpy-atom.S \
-    arch-x86/atom/string/ssse3-strcmp-atom.S \
-    arch-x86/atom/string/ssse3-strncmp-atom.S \
-    arch-x86/atom/string/ssse3-strcat-atom.S \
-    arch-x86/atom/string/ssse3-wcscat-atom.S \
-    arch-x86/atom/string/ssse3-wcscpy-atom.S
diff --git a/libc/arch-x86/x86.mk b/libc/arch-x86/x86.mk
index e5d70a9..b4056bb 100644
--- a/libc/arch-x86/x86.mk
+++ b/libc/arch-x86/x86.mk
@@ -1,17 +1,103 @@
 # 32-bit x86.
 
 #
-# Default implementations of functions that are commonly optimized.
+# Generic x86 optimizations, may be overriden by CPU variants.
 #
 
-libc_common_src_files_x86 += \
-    bionic/__memcpy_chk.cpp \
-    bionic/__memset_chk.cpp \
-    bionic/__strcpy_chk.cpp \
-    bionic/__strcat_chk.cpp \
+libc_bionic_src_files_x86 += \
+    arch-x86/atom/string/sse2-memchr-atom.S \
+    arch-x86/atom/string/sse2-memrchr-atom.S \
+    arch-x86/atom/string/sse2-strchr-atom.S \
+    arch-x86/atom/string/sse2-strnlen-atom.S \
+    arch-x86/atom/string/sse2-strrchr-atom.S \
+    arch-x86/atom/string/sse2-wcschr-atom.S \
+    arch-x86/atom/string/sse2-wcsrchr-atom.S \
+    arch-x86/atom/string/sse2-wcslen-atom.S \
+    arch-x86/atom/string/sse2-wcscmp-atom.S \
+    arch-x86/silvermont/string/sse2-bcopy-slm.S \
+    arch-x86/silvermont/string/sse2-bzero-slm.S \
+    arch-x86/silvermont/string/sse2-memcpy-slm.S \
+    arch-x86/silvermont/string/sse2-memmove-slm.S \
+    arch-x86/silvermont/string/sse2-memset-slm.S \
+    arch-x86/silvermont/string/sse2-stpcpy-slm.S \
+    arch-x86/silvermont/string/sse2-stpncpy-slm.S \
+    arch-x86/silvermont/string/sse2-strcpy-slm.S \
+    arch-x86/silvermont/string/sse2-strlen-slm.S \
+    arch-x86/silvermont/string/sse2-strncpy-slm.S
 
-libc_freebsd_src_files_x86 += \
-    upstream-freebsd/lib/libc/string/wmemmove.c \
+libc_bionic_src_files_x86 += \
+    arch-x86/generic/string/memcmp.S \
+    arch-x86/generic/string/strcmp.S \
+    arch-x86/generic/string/strncmp.S \
+    arch-x86/generic/string/strcat.S
+
+ifeq ($(ARCH_X86_HAVE_SSSE3),true)
+libc_bionic_src_files_x86 += \
+    arch-x86/atom/string/ssse3-strncat-atom.S \
+    arch-x86/atom/string/ssse3-strlcat-atom.S \
+    arch-x86/atom/string/ssse3-strlcpy-atom.S \
+    arch-x86/atom/string/ssse3-strcmp-atom.S \
+    arch-x86/atom/string/ssse3-strncmp-atom.S \
+    arch-x86/atom/string/ssse3-strcat-atom.S \
+    arch-x86/atom/string/ssse3-wcscat-atom.S \
+    arch-x86/atom/string/ssse3-wcscpy-atom.S
+libc_bionic_src_files_exclude_x86 += \
+    arch-x86/generic/string/strcmp.S \
+    arch-x86/generic/string/strncmp.S \
+    arch-x86/generic/string/strcat.S
+endif
+
+ifeq ($(ARCH_X86_HAVE_SSE4),true)
+libc_bionic_src_files_x86 += \
+    arch-x86/silvermont/string/sse4-memcmp-slm.S \
+    arch-x86/silvermont/string/sse4-wmemcmp-slm.S
+libc_bionic_src_files_exclude_x86 += \
+    arch-x86/generic/string/memcmp.S
+endif
+
+#
+# Remove default implementations that we have optimized versions of.
+#
+
+libc_freebsd_src_files_exclude_x86 += \
+    upstream-freebsd/lib/libc/string/wcschr.c \
+    upstream-freebsd/lib/libc/string/wcscmp.c \
+    upstream-freebsd/lib/libc/string/wcslen.c \
+    upstream-freebsd/lib/libc/string/wcsrchr.c \
+
+ifeq ($(ARCH_X86_HAVE_SSSE3),true)
+libc_freebsd_src_files_exclude_x86 += \
+    upstream-freebsd/lib/libc/string/wcscat.c \
+    upstream-freebsd/lib/libc/string/wcscpy.c
+endif
+
+ifeq ($(ARCH_X86_HAVE_SSE4),true)
+libc_freebsd_src_files_exclude_x86 += \
+    upstream-freebsd/lib/libc/string/wmemcmp.c
+endif
+
+libc_openbsd_src_files_exclude_x86 += \
+    upstream-openbsd/lib/libc/string/memchr.c \
+    upstream-openbsd/lib/libc/string/memmove.c \
+    upstream-openbsd/lib/libc/string/memrchr.c \
+    upstream-openbsd/lib/libc/string/stpcpy.c \
+    upstream-openbsd/lib/libc/string/stpncpy.c \
+    upstream-openbsd/lib/libc/string/strcat.c \
+    upstream-openbsd/lib/libc/string/strcpy.c \
+    upstream-openbsd/lib/libc/string/strncmp.c \
+    upstream-openbsd/lib/libc/string/strncpy.c \
+
+ifeq ($(ARCH_X86_HAVE_SSSE3),true)
+libc_openbsd_src_files_exclude_x86 += \
+    upstream-openbsd/lib/libc/string/strlcat.c \
+    upstream-openbsd/lib/libc/string/strlcpy.c \
+    upstream-openbsd/lib/libc/string/strncat.c
+endif
+
+libc_bionic_src_files_exclude_x86 += \
+    bionic/strchr.cpp \
+    bionic/strnlen.c \
+    bionic/strrchr.cpp \
 
 #
 # Inherently architecture-specific functions.
@@ -30,12 +116,14 @@
 ## ARCH variant specific source files
 arch_variant_mk := $(LOCAL_PATH)/arch-x86/$(TARGET_ARCH_VARIANT)/$(TARGET_ARCH_VARIANT).mk
 ifeq ($(wildcard $(arch_variant_mk)),)
-    arch_variant_mk := $(LOCAL_PATH)/arch-x86/generic/generic.mk
+    arch_variant_mk :=
 endif
+ifneq ($(arch_variant_mk),)
 include $(arch_variant_mk)
 libc_common_additional_dependencies += $(arch_variant_mk)
 
 arch_variant_mk :=
+endif
 
 libc_crt_target_cflags_x86 := \
     -m32 \