diff --git a/libavcodec/mips/aacdec_mips.h b/libavcodec/mips/aacdec_mips.h
index 9ba307962f..c9efdbbe38 100644
--- a/libavcodec/mips/aacdec_mips.h
+++ b/libavcodec/mips/aacdec_mips.h
@@ -68,10 +68,10 @@ static inline float *VMUL2_mips(float *dst, const float *v, unsigned idx,
     float *ret;
 
     __asm__ volatile(
-        "andi    %[temp3],  %[idx],       15           \n\t"
-        "ext     %[temp4],  %[idx],       4,      4    \n\t"
+        "andi    %[temp3],  %[idx],       0x0F         \n\t"
+        "andi    %[temp4],  %[idx],       0xF0         \n\t"
         "sll     %[temp3],  %[temp3],     2            \n\t"
-        "sll     %[temp4],  %[temp4],     2            \n\t"
+        "srl     %[temp4],  %[temp4],     2            \n\t"
         "lwc1    %[temp2],  0(%[scale])                \n\t"
         "lwxc1   %[temp0],  %[temp3](%[v])             \n\t"
         "lwxc1   %[temp1],  %[temp4](%[v])             \n\t"
@@ -99,14 +99,13 @@ static inline float *VMUL4_mips(float *dst, const float *v, unsigned idx,
     float *ret;
 
     __asm__ volatile(
-        "andi    %[temp0],  %[idx],       3           \n\t"
-        "ext     %[temp1],  %[idx],       2,      2   \n\t"
-        "ext     %[temp2],  %[idx],       4,      2   \n\t"
-        "ext     %[temp3],  %[idx],       6,      2   \n\t"
+        "andi    %[temp0],  %[idx],       0x03        \n\t"
+        "andi    %[temp1],  %[idx],       0x0C        \n\t"
+        "andi    %[temp2],  %[idx],       0x30        \n\t"
+        "andi    %[temp3],  %[idx],       0xC0        \n\t"
         "sll     %[temp0],  %[temp0],     2           \n\t"
-        "sll     %[temp1],  %[temp1],     2           \n\t"
-        "sll     %[temp2],  %[temp2],     2           \n\t"
-        "sll     %[temp3],  %[temp3],     2           \n\t"
+        "srl     %[temp2],  %[temp2],     2           \n\t"
+        "srl     %[temp3],  %[temp3],     4           \n\t"
         "lwc1    %[temp4],  0(%[scale])               \n\t"
         "lwxc1   %[temp5],  %[temp0](%[v])            \n\t"
         "lwxc1   %[temp6],  %[temp1](%[v])            \n\t"
@@ -142,14 +141,14 @@ static inline float *VMUL2S_mips(float *dst, const float *v, unsigned idx,
     float *ret;
 
     __asm__ volatile(
-        "andi    %[temp0],  %[idx],       15         \n\t"
-        "ext     %[temp1],  %[idx],       4,     4   \n\t"
+        "andi    %[temp0],  %[idx],       0x0F       \n\t"
+        "andi    %[temp1],  %[idx],       0xF0       \n\t"
         "lw      %[temp4],  0(%[scale])              \n\t"
         "srl     %[temp2],  %[sign],      1          \n\t"
         "sll     %[temp3],  %[sign],      31         \n\t"
         "sll     %[temp2],  %[temp2],     31         \n\t"
         "sll     %[temp0],  %[temp0],     2          \n\t"
-        "sll     %[temp1],  %[temp1],     2          \n\t"
+        "srl     %[temp1],  %[temp1],     2          \n\t"
         "lwxc1   %[temp8],  %[temp0](%[v])           \n\t"
         "lwxc1   %[temp9],  %[temp1](%[v])           \n\t"
         "xor     %[temp5],  %[temp4],     %[temp2]   \n\t"
@@ -185,22 +184,24 @@ static inline float *VMUL4S_mips(float *dst, const float *v, unsigned idx,
 
     __asm__ volatile(
         "lw      %[temp0],   0(%[scale])               \n\t"
-        "and     %[temp1],   %[idx],       3           \n\t"
-        "ext     %[temp2],   %[idx],       2,      2   \n\t"
-        "ext     %[temp3],   %[idx],       4,      2   \n\t"
-        "ext     %[temp4],   %[idx],       6,      2   \n\t"
-        "sll     %[temp1],   %[temp1],     2           \n\t"
-        "sll     %[temp2],   %[temp2],     2           \n\t"
-        "sll     %[temp3],   %[temp3],     2           \n\t"
-        "sll     %[temp4],   %[temp4],     2           \n\t"
+        "andi    %[temp1],  %[idx],       0x03         \n\t"
+        "andi    %[temp2],  %[idx],       0x0C         \n\t"
+        "andi    %[temp3],  %[idx],       0x30         \n\t"
+        "andi    %[temp4],  %[idx],       0xC0         \n\t"
+        "sll     %[temp1],  %[temp1],     2            \n\t"
+        "srl     %[temp3],  %[temp3],     2            \n\t"
+        "srl     %[temp4],  %[temp4],     4            \n\t"
         "lwxc1   %[temp10],  %[temp1](%[v])            \n\t"
         "lwxc1   %[temp11],  %[temp2](%[v])            \n\t"
         "lwxc1   %[temp12],  %[temp3](%[v])            \n\t"
         "lwxc1   %[temp13],  %[temp4](%[v])            \n\t"
         "and     %[temp1],   %[sign],      %[mask]     \n\t"
-        "ext     %[temp2],   %[idx],       12,     1   \n\t"
-        "ext     %[temp3],   %[idx],       13,     1   \n\t"
-        "ext     %[temp4],   %[idx],       14,     1   \n\t"
+        "srl     %[temp2],   %[idx],       12          \n\t"
+        "srl     %[temp3],   %[idx],       13          \n\t"
+        "srl     %[temp4],   %[idx],       14          \n\t"
+        "andi    %[temp2],   %[temp2],     1           \n\t"
+        "andi    %[temp3],   %[temp3],     1           \n\t"
+        "andi    %[temp4],   %[temp4],     1           \n\t"
         "sllv    %[sign],    %[sign],      %[temp2]    \n\t"
         "xor     %[temp1],   %[temp0],     %[temp1]    \n\t"
         "and     %[temp2],   %[sign],      %[mask]     \n\t"