diff --git a/src/util/arch/ppc64el/simd_utils.h b/src/util/arch/ppc64el/simd_utils.h
index 44c9122c..32014e54 100644
--- a/src/util/arch/ppc64el/simd_utils.h
+++ b/src/util/arch/ppc64el/simd_utils.h
@@ -285,7 +285,6 @@ m128 loadbytes128(const void *ptr, unsigned int n) {
     return a;
 }
 
-
 #define CASE_ALIGN_VECTORS(a, b, offset)  case offset: return (m128)vec_sld((int8x16_t)(b), (int8x16_t)(a), (16 - offset)); break;
 
 static really_really_inline
@@ -326,21 +325,21 @@ m128 palignr(m128 r, m128 l, int offset) {
 
 static really_really_inline
 m128 rshiftbyte_m128(m128 a, unsigned b) {
-   return rshift_m128(a,b);
+    return palignr_imm(zeroes128(), a, b);
 }
 
 static really_really_inline
 m128 lshiftbyte_m128(m128 a, unsigned b) {
-   return lshift_m128(a,b);
+    return palignr_imm(a, zeroes128(), 16 - b);
 }
 
 static really_inline
 m128 variable_byte_shift_m128(m128 in, s32 amount) {
     assert(amount >= -16 && amount <= 16);
-    if (amount < 0){
-	    return palignr_imm(zeroes128(), in, -amount);
-    } else{
-	    return palignr_imm(in, zeroes128(), 16 - amount);
+    if (amount < 0) {
+        return rshiftbyte_m128(in, -amount);
+    } else {
+        return lshiftbyte_m128(in, amount);
     }
 }
 
diff --git a/unit/internal/simd_utils.cpp b/unit/internal/simd_utils.cpp
index 69f1a64c..c5cfec7b 100644
--- a/unit/internal/simd_utils.cpp
+++ b/unit/internal/simd_utils.cpp
@@ -723,10 +723,59 @@ TEST(SimdUtilsTest, set2x128) {
 }
 #endif
 
+#define TEST_LSHIFTBYTE128(v1, buf, l) {                                                 \
+                                           m128 v_shifted = lshiftbyte_m128(v1, l);      \
+                                           storeu128(res, v_shifted);                    \
+                                           int i;                                        \
+                                           for (i=0; i < l; i++) {                       \
+                                               assert(res[i] == 0);                      \
+                                           }                                             \
+                                           for (; i < 16; i++) {                         \
+                                               assert(res[i] == vec[i - l]);             \
+                                           }                                             \
+                                       }
+
+TEST(SimdUtilsTest, lshiftbyte128){
+    u8 vec[16];
+    u8 res[16];
+    for (int i=0; i<16; i++) {
+        vec[i]=i;
+    }
+    m128 v1 = loadu128(vec);
+    for (int j = 0; j<16; j++){
+        TEST_LSHIFTBYTE128(v1, vec, j);
+    }
+}
+
+#define TEST_RSHIFTBYTE128(v1, buf, l) {                                                 \
+                                           m128 v_shifted = rshiftbyte_m128(v1, l);      \
+                                           storeu128(res, v_shifted);                    \
+                                           int i;                                        \
+                                           for (i=15; i >= 16 - l; i--) {                \
+                                               assert(res[i] == 0);                      \
+                                           }                                             \
+                                           for (; i >= 0; i--) {                         \
+                                               assert(res[i] == vec[i + l]);             \
+                                           }                                             \
+                                       }
+
+TEST(SimdUtilsTest, rshiftbyte128){
+    u8 vec[16];
+    u8 res[16];
+    for (int i=0; i<16; i++) {
+        vec[i]=i;
+    }
+    m128 v1 = loadu128(vec);
+    for (int j = 0; j<16; j++){
+        TEST_RSHIFTBYTE128(v1, vec, j);
+    }
+}
+
 TEST(SimdUtilsTest, variableByteShift128) {
     char base[] = "0123456789ABCDEF";
     m128 in = loadu128(base);
 
+
     EXPECT_TRUE(!diff128(rshiftbyte_m128(in, 0),
                          variable_byte_shift_m128(in, 0)));
     EXPECT_TRUE(!diff128(rshiftbyte_m128(in, 1),
@@ -773,7 +822,7 @@ TEST(SimdUtilsTest, variableByteShift128) {
     EXPECT_TRUE(!diff128(lshiftbyte_m128(in, 10),
                          variable_byte_shift_m128(in, 10)));
 
-    EXPECT_TRUE(!diff128(zeroes128(), variable_byte_shift_m128(in, 16)));
+    EXPECT_TRUE(!diff128(lshiftbyte_m128(in, 15), variable_byte_shift_m128(in, 15)));
     EXPECT_TRUE(!diff128(zeroes128(), variable_byte_shift_m128(in, -16)));
 }