Optimise srot for POWER9

Use lxvd2x instruction instead of lxvw4x.
lxvd2x performs far better on the new POWER architecture than lxvw4x.

diff --git a/kernel/power/srot_microk_power8.c b/kernel/power/srot_microk_power8.c
index 0a18c16e02abcb7c510228228d16bc6ee2825fc4..6eecb60a1ad906ea5149233d362d8506298f19f3 100644 (file)
--- a/kernel/power/srot_microk_power8.c
+++ b/kernel/power/srot_microk_power8.c
@@ -57,15 +57,15 @@ static void srot_kernel_16 (long n, float *x, float *y, float c, float s)
        "xscvdpspn      37, %x14        \n\t"   // load s to all words
        "xxspltw                37, 37, 0       \n\t"
 
-       "lxvw4x         32, 0, %3       \n\t"   // load x
-       "lxvw4x         33, %15, %3     \n\t"
-       "lxvw4x         34, %16, %3     \n\t"
-       "lxvw4x         35, %17, %3     \n\t"
+       "lxvd2x         32, 0, %3       \n\t"   // load x
+       "lxvd2x         33, %15, %3     \n\t"
+       "lxvd2x         34, %16, %3     \n\t"
+       "lxvd2x         35, %17, %3     \n\t"
 
-       "lxvw4x         48, 0, %4       \n\t"   // load y
-       "lxvw4x         49, %15, %4     \n\t"
-       "lxvw4x         50, %16, %4     \n\t"
-       "lxvw4x         51, %17, %4     \n\t"
+       "lxvd2x         48, 0, %4       \n\t"   // load y
+       "lxvd2x         49, %15, %4     \n\t"
+       "lxvd2x         50, %16, %4     \n\t"
+       "lxvd2x         51, %17, %4     \n\t"
 
        "addi           %3, %3, 64      \n\t"
        "addi           %4, %4, 64      \n\t"
@@ -89,26 +89,26 @@ static void srot_kernel_16 (long n, float *x, float *y, float c, float s)
        "xvmulsp                44, 32, 37      \n\t"   // s * x
        "xvmulsp                45, 33, 37      \n\t"
 
-       "lxvw4x         32, 0, %3       \n\t"   // load x
-       "lxvw4x         33, %15, %3     \n\t"
+       "lxvd2x         32, 0, %3       \n\t"   // load x
+       "lxvd2x         33, %15, %3     \n\t"
 
        "xvmulsp                46, 34, 37      \n\t"
        "xvmulsp                47, 35, 37      \n\t"
 
-       "lxvw4x         34, %16, %3     \n\t"
-       "lxvw4x         35, %17, %3     \n\t"
+       "lxvd2x         34, %16, %3     \n\t"
+       "lxvd2x         35, %17, %3     \n\t"
 
        "xvmulsp                %x9, 48, 37     \n\t"   // s * y
        "xvmulsp                %x10, 49, 37    \n\t"
 
-       "lxvw4x         48, 0, %4       \n\t"   // load y
-       "lxvw4x         49, %15, %4     \n\t"
+       "lxvd2x         48, 0, %4       \n\t"   // load y
+       "lxvd2x         49, %15, %4     \n\t"
 
        "xvmulsp                %x11, 50, 37    \n\t"
        "xvmulsp                %x12, 51, 37    \n\t"
 
-       "lxvw4x         50, %16, %4     \n\t"
-       "lxvw4x         51, %17, %4     \n\t"
+       "lxvd2x         50, %16, %4     \n\t"
+       "lxvd2x         51, %17, %4     \n\t"
 
        "xvaddsp                40, 40, %x9     \n\t"   // c * x + s * y
        "xvaddsp                41, 41, %x10    \n\t"   // c * x + s * y
@@ -124,15 +124,15 @@ static void srot_kernel_16 (long n, float *x, float *y, float c, float s)
        "xvsubsp                %x7, %x7, 46    \n\t"   // c * y - s * x
        "xvsubsp                %x8, %x8, 47    \n\t"   // c * y - s * x
 
-       "stxvw4x                40, 0, %3       \n\t"   // store x
-       "stxvw4x                41, %15, %3     \n\t"
-       "stxvw4x                42, %16, %3     \n\t"
-       "stxvw4x                43, %17, %3     \n\t"
+       "stxvd2x                40, 0, %3       \n\t"   // store x
+       "stxvd2x                41, %15, %3     \n\t"
+       "stxvd2x                42, %16, %3     \n\t"
+       "stxvd2x                43, %17, %3     \n\t"
 
-       "stxvw4x                %x5, 0, %4      \n\t"   // store y
-       "stxvw4x                %x6, %15, %4    \n\t"
-       "stxvw4x                %x7, %16, %4    \n\t"
-       "stxvw4x                %x8, %17, %4    \n\t"
+       "stxvd2x                %x5, 0, %4      \n\t"   // store y
+       "stxvd2x                %x6, %15, %4    \n\t"
+       "stxvd2x                %x7, %16, %4    \n\t"
+       "stxvd2x                %x8, %17, %4    \n\t"
 
        "addi           %3, %3, 128     \n\t"
        "addi           %4, %4, 128     \n\t"
@@ -175,15 +175,15 @@ static void srot_kernel_16 (long n, float *x, float *y, float c, float s)
        "xvsubsp                %x7, %x7, 46    \n\t"   // c * y - s * x
        "xvsubsp                %x8, %x8, 47    \n\t"   // c * y - s * x
 
-       "stxvw4x                40, 0, %3       \n\t"   // store x
-       "stxvw4x                41, %15, %3     \n\t"
-       "stxvw4x                42, %16, %3     \n\t"
-       "stxvw4x                43, %17, %3     \n\t"
+       "stxvd2x                40, 0, %3       \n\t"   // store x
+       "stxvd2x                41, %15, %3     \n\t"
+       "stxvd2x                42, %16, %3     \n\t"
+       "stxvd2x                43, %17, %3     \n\t"
 
-       "stxvw4x                %x5, 0, %4      \n\t"   // store y
-       "stxvw4x                %x6, %15, %4    \n\t"
-       "stxvw4x                %x7, %16, %4    \n\t"
-       "stxvw4x                %x8, %17, %4    \n"
+       "stxvd2x                %x5, 0, %4      \n\t"   // store y
+       "stxvd2x                %x6, %15, %4    \n\t"
+       "stxvd2x                %x7, %16, %4    \n\t"
+       "stxvd2x                %x8, %17, %4    \n"
 
      "#n=%2 x=%0=%3 y=%1=%4 c=%13 s=%14 o16=%15 o32=%16 o48=%17\n"
      "#t0=%x5 t1=%x6 t2=%x7 t3=%x8 t4=%x9 t5=%x10 t6=%x11 t7=%x12"