diff --git a/config/bulldozer/make_defs.mk b/config/bulldozer/make_defs.mk
index 6a75d199e..06f7d8251 100644
--- a/config/bulldozer/make_defs.mk
+++ b/config/bulldozer/make_defs.mk
@@ -63,10 +63,10 @@ endif
 # Flags specific to optimized kernels.
 CKOPTFLAGS     := $(COPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CKVECFLAGS     := -mfpmath=sse -mavx -mfma4 -march=bdver1
+CKVECFLAGS     := -mfpmath=sse -mavx -mfma4 -march=bdver1 -mno-tbm -mno-xop -mno-lwp
 else
 ifeq ($(CC_VENDOR),clang)
-CKVECFLAGS     := -mfpmath=sse -mavx -mfma4 -march=bdver1
+CKVECFLAGS     := -mfpmath=sse -mavx -mfma4 -march=bdver1 -mno-tbm -mno-xop -mno-lwp
 else
 $(error gcc or clang are required for this configuration.)
 endif
diff --git a/config/excavator/make_defs.mk b/config/excavator/make_defs.mk
index 40a552198..48de8ed50 100644
--- a/config/excavator/make_defs.mk
+++ b/config/excavator/make_defs.mk
@@ -63,10 +63,10 @@ endif
 # Flags specific to optimized kernels.
 CKOPTFLAGS     := $(COPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CKVECFLAGS     := -mfpmath=sse -mavx -mfma -mno-fma4 -march=bdver4
+CKVECFLAGS     := -mfpmath=sse -mavx -mfma -march=bdver4 -mno-fma4 -mno-tbm -mno-xop -mno-lwp
 else
 ifeq ($(CC_VENDOR),clang)
-CKVECFLAGS     := -mfpmath=sse -mavx -mfma -mno-fma4 -march=bdver4
+CKVECFLAGS     := -mfpmath=sse -mavx -mfma -march=bdver4 -mno-fma4 -mno-tbm -mno-xop -mno-lwp
 else
 $(error gcc or clang are required for this configuration.)
 endif
diff --git a/config/piledriver/make_defs.mk b/config/piledriver/make_defs.mk
index 87b1b8644..425040692 100644
--- a/config/piledriver/make_defs.mk
+++ b/config/piledriver/make_defs.mk
@@ -57,16 +57,16 @@ endif
 ifeq ($(DEBUG_TYPE),noopt)
 COPTFLAGS      := -O0
 else
-COPTFLAGS      := -O2
+COPTFLAGS      := -O3
 endif
 
 # Flags specific to optimized kernels.
 CKOPTFLAGS     := $(COPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CKVECFLAGS     := -mfpmath=sse -mavx -mfma -mno-fma4 -march=bdver2
+CKVECFLAGS     := -mfpmath=sse -mavx -mfma -march=bdver2 -mno-fma4 -mno-tbm -mno-xop -mno-lwp
 else
 ifeq ($(CC_VENDOR),clang)
-CKVECFLAGS     := -mfpmath=sse -mavx -mfma -mno-fma4 -march=bdver2
+CKVECFLAGS     := -mfpmath=sse -mavx -mfma -march=bdver2 -mno-fma4 -mno-tbm -mno-xop -mno-lwp
 else
 $(error gcc or clang are required for this configuration.)
 endif
diff --git a/config/steamroller/make_defs.mk b/config/steamroller/make_defs.mk
index 656076fd9..58315d7f5 100644
--- a/config/steamroller/make_defs.mk
+++ b/config/steamroller/make_defs.mk
@@ -63,10 +63,10 @@ endif
 # Flags specific to optimized kernels.
 CKOPTFLAGS     := $(COPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CKVECFLAGS     := -mfpmath=sse -mavx -mfma -mno-fma4 -march=bdver3
+CKVECFLAGS     := -mfpmath=sse -mavx -mfma -march=bdver3 -mno-fma4 -mno-tbm -mno-xop -mno-lwp
 else
 ifeq ($(CC_VENDOR),clang)
-CKVECFLAGS     := -mfpmath=sse -mavx -mfma -mno-fma4 -march=bdver3
+CKVECFLAGS     := -mfpmath=sse -mavx -mfma -march=bdver3 -mno-fma4 -mno-tbm -mno-xop -mno-lwp
 else
 $(error gcc or clang are required for this configuration.)
 endif