Index: buildbot/osuosl/master/config/builders.py
===================================================================
--- buildbot/osuosl/master/config/builders.py
+++ buildbot/osuosl/master/config/builders.py
@@ -269,7 +269,7 @@
                     useTwoStage=False,
                     runTestSuite=True,
                     testsuite_flags=[
-                        '--cppflags', '-mcpu=cortex-a15 -marm',
+                        '--cppflags', '-O3 -mcpu=cortex-a15 -marm',
                         '--threads=32', '--build-threads=32'],
                     extra_cmake_args=["-DLLVM_TARGETS_TO_BUILD='ARM'"])},
 
@@ -346,7 +346,7 @@
                     useTwoStage=False,
                     runTestSuite=True,
                     testsuite_flags=[
-                        '--cppflags', '-mcpu=cortex-a57',
+                        '--cppflags', '-O3 -mcpu=cortex-a57',
                         '--threads=32', '--build-threads=32'],
                     extra_cmake_args=["-DLLVM_TARGETS_TO_BUILD='ARM;AArch64'"])},
 
@@ -363,7 +363,7 @@
                 useTwoStage=True,
                 runTestSuite=True,
                 testsuite_flags=[
-                    '--cppflags', '-mcpu=cortex-a57 -fuse-ld=lld',
+                    '--cppflags', '-O3 -mcpu=cortex-a57 -fuse-ld=lld',
                     '--threads=32', '--build-threads=32'],
                 extra_cmake_args=[
                     "-DCMAKE_C_FLAGS='-mcpu=cortex-a57'",
@@ -401,7 +401,7 @@
                     useTwoStage=True,
                     runTestSuite=True,
                     testsuite_flags=[
-                        '--cppflags', '-mcpu=cortex-a15 -mfpu=vfpv3 -marm',
+                        '--cppflags', '-O3 -mcpu=cortex-a15 -mfpu=vfpv3 -marm',
                         '--threads=4', '--build-threads=4'],
                     extra_cmake_args=[
                         "-DCOMPILER_RT_TEST_COMPILER_CFLAGS='-mcpu=cortex-a15 -mfpu=vfpv3 -marm'",
@@ -421,7 +421,7 @@
                     useTwoStage=True,
                     runTestSuite=True,
                     testsuite_flags=[
-                        '--cppflags', '-mcpu=cortex-a15 -mthumb',
+                        '--cppflags', '-O3 -mcpu=cortex-a15 -mthumb',
                         '--threads=4', '--build-threads=4'],
                     extra_cmake_args=[
                         "-DCMAKE_C_FLAGS='-mcpu=cortex-a15 -mthumb'",
@@ -444,7 +444,7 @@
                     useTwoStage=True,
                     runTestSuite=True,
                     testsuite_flags=[
-                        '--cppflags', '-mcpu=cortex-a57 -fuse-ld=lld',
+                        '--cppflags', '-O3 -mcpu=cortex-a57 -fuse-ld=lld',
                         '--threads=32', '--build-threads=32'],
                     extra_cmake_args=[
                         "-DCMAKE_C_FLAGS='-mcpu=cortex-a57'",
@@ -468,7 +468,7 @@
                     testStage1=False,
                     runTestSuite=True,
                     testsuite_flags=[
-                        '--cppflags', '-mcpu=cortex-a57',
+                        '--cppflags', '-O3 -mcpu=cortex-a57',
                         '--threads=32', '--build-threads=32'],
                     extra_cmake_args=[
                         "-DCMAKE_C_FLAGS='-mcpu=cortex-a57'",