diff --git a/media/libopus/silk/NSQ_del_dec.c b/media/libopus/silk/NSQ_del_dec.c
index 522be4066..12861e14f 100644
--- a/media/libopus/silk/NSQ_del_dec.c
+++ b/media/libopus/silk/NSQ_del_dec.c
@@ -106,6 +106,13 @@ static OPUS_INLINE void silk_noise_shape_quantizer_del_dec(
     opus_int            decisionDelay           /* I                                        */
 );
 
+#if (__GNUC__ == 4 && __GNUC_MINOR__ == 8 && __GNUC_PATCHLEVEL__ == 5)
+#ifdef TENFOURFOX_G5
+/* work around issue 461 */
+__attribute__((optimize("no-tree-vectorize")))
+#endif
+#endif
+
 void silk_NSQ_del_dec(
     const silk_encoder_state    *psEncC,                                    /* I/O  Encoder State                   */
     silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                       */
diff --git a/media/libyuv/source/row_common.cc b/media/libyuv/source/row_common.cc
index a718399eb..dcd71353c 100644
--- a/media/libyuv/source/row_common.cc
+++ b/media/libyuv/source/row_common.cc
@@ -1116,6 +1116,13 @@ void I422ToARGB4444Row_C(const uint8* src_y,
   }
 }
 
+#if (__GNUC__ == 4 && __GNUC_MINOR__ == 8 && __GNUC_PATCHLEVEL__ == 5)
+#ifdef __ppc__
+/* work around issue 461 */
+__attribute__((optimize("no-tree-vectorize")))
+#endif
+#endif
+
 void I422ToARGB1555Row_C(const uint8* src_y,
                          const uint8* src_u,
                          const uint8* src_v,
@@ -1154,6 +1161,16 @@ void I422ToARGB1555Row_C(const uint8* src_y,
   }
 }
 
+#if (__GNUC__ == 4 && __GNUC_MINOR__ == 8 && __GNUC_PATCHLEVEL__ == 5)
+#ifdef __ppc__
+#ifndef TENFOURFOX_G5
+/* Work around issue 461, 7450 only
+   Safe to comment for a 7400 build */
+__attribute__((optimize("no-tree-vectorize")))
+#endif
+#endif
+#endif
+
 void I422ToRGB565Row_C(const uint8* src_y,
                        const uint8* src_u,
                        const uint8* src_v,
@@ -1280,6 +1297,14 @@ void NV21ToARGBRow_C(const uint8* src_y,
   }
 }
 
+#if (__GNUC__ == 4 && __GNUC_MINOR__ == 8 && __GNUC_PATCHLEVEL__ == 5)
+#ifdef __ppc__
+/* work around issue 461 */
+__attribute__((optimize("no-tree-vectorize")))
+#endif
+#endif
+
+
 void NV12ToRGB565Row_C(const uint8* src_y,
                        const uint8* usrc_v,
                        uint8* dst_rgb565,
@@ -1315,6 +1340,13 @@ void NV12ToRGB565Row_C(const uint8* src_y,
   }
 }
 
+#if (__GNUC__ == 4 && __GNUC_MINOR__ == 8 && __GNUC_PATCHLEVEL__ == 5)
+#ifdef __ppc__
+/* work around issue 461 */
+__attribute__((optimize("no-tree-vectorize")))
+#endif
+#endif
+
 void NV21ToRGB565Row_C(const uint8* src_y,
                        const uint8* vsrc_u,
                        uint8* dst_rgb565,
diff --git a/media/libyuv/source/scale_common.cc b/media/libyuv/source/scale_common.cc
index 6ed8bfaf9..c5700bfbb 100644
--- a/media/libyuv/source/scale_common.cc
+++ b/media/libyuv/source/scale_common.cc
@@ -88,6 +88,13 @@ void ScaleRowDown4_C(const uint8* src_ptr, ptrdiff_t src_stride,
   }
 }
 
+#if (__GNUC__ == 4 && __GNUC_MINOR__ == 8 && __GNUC_PATCHLEVEL__ == 5)
+#ifdef TENFOURFOX_G5
+/* work around issue 461 */
+__attribute__((optimize("no-tree-vectorize")))
+#endif
+#endif
+
 void ScaleRowDown4Box_C(const uint8* src_ptr, ptrdiff_t src_stride,
                         uint8* dst, int dst_width) {
   intptr_t stride = src_stride;
diff --git a/media/webrtc/trunk/webrtc/modules/audio_coding/codecs/isac/main/source/entropy_coding.c b/media/webrtc/trunk/webrtc/modules/audio_coding/codecs/isac/main/source/entropy_coding.c
index dd1d64af7..c9e04b1e8 100644
--- a/media/webrtc/trunk/webrtc/modules/audio_coding/codecs/isac/main/source/entropy_coding.c
+++ b/media/webrtc/trunk/webrtc/modules/audio_coding/codecs/isac/main/source/entropy_coding.c
@@ -385,6 +385,12 @@ int WebRtcIsac_DecodeSpec(Bitstr* streamdata, int16_t AvgPitchGain_Q12,
   return len;
 }
 
+#if (__GNUC__ == 4 && __GNUC_MINOR__ == 8 && __GNUC_PATCHLEVEL__ == 5)
+#ifdef TENFOURFOX_G5
+/* work around issue 461 */
+__attribute__((optimize("no-tree-vectorize")))
+#endif
+#endif
 
 int WebRtcIsac_EncodeSpec(const int16_t* fr, const int16_t* fi,
                           int16_t AvgPitchGain_Q12, enum ISACBand band,