Re: [PATCH] rs6000, fix vec_replace_unaligned builtin arguments

["Kewen.Lin" <linkw@linux.ibm.com>]

Hi Carl,

on 2023/6/16 00:00, Carl Love wrote:
> On Tue, 2023-06-13 at 11:24 +0800, Kewen.Lin wrote:
>> Hi Carl,
>>
>> on 2023/5/31 04:41, Carl Love wrote:
>>> GCC maintainers:
>>>
>>> The following patch fixes the first argument in the builtin
>>> definition
>>> and the corresponding test cases.  Initially, the builtin
>>> specification
>>> was wrong due to a cut and past error.  The documentation was fixed
>>> in:
>>>
>>>
>>>    commit 8cb748a31cd8c7ac9c88b6abc38ce077dd462a7a
>>>    Author: Bill Schmidt <wschmidt@linux.ibm.com>
>>>    Date:   Fri Feb 4 13:26:44 2022 -0600
>>>
>>>        rs6000: Clean up ISA 3.1 documentation [PR100808]
>>>
>>>        Due to a pasto error in the documentation,
>>> vec_replace_unaligned was
>>>        implemented with the same function prototypes as
>>> vec_replace_elt.  It was
>>>        intended that vec_replace_unaligned always specify output
>>> vectors as having
>>>        type vector unsigned char, to emphasize that elements are
>>> potentially
>>>        misaligned by this built-in function.  This patch corrects
>>> the
>>>        misimplementation.
>>>
>>>        2022-02-04  Bill Schmidt  <wschmidt@linux.ibm.com>
>>>
>>>        gcc/
>>>                PR target/100808
>>>                * doc/extend.texi (Basic PowerPC Built-in Functions
>>> Available on ISA
>>>                3.1): Provide consistent type names.  Remove
>>> unnecessary semicolons.
>>>                Fix bad line breaks.
>>>
>>
>> Wrong referred commit, should be
>> ed3fea09b18f67e757b5768b42cb6e816626f1db.
>> The above commit used the wrong commit log.
> 
> Fixed the commit reference as noted.
> 
>>
>>> This patch fixes the arguments in the definitions and updates the
>>> testcases accordingly.  Additionally, a few minor spacing issues
>>> are
>>> fixed.
>>>
>>> The patch has been tested on Power 10 with no regressions.  Please
>>> let
>>> me know if the patch is acceptable for mainline.  Thanks.
>>>
>>>                  Carl 
>>>
>>> --------------------------------------------------
>>> rs6000, fix vec_replace_unaligned builtin arguments
>>>
>>> The first argument of the vec_replace_unaligned builtin should
>>> always be
>>> unsinged char, as specified in gcc/doc/extend.texi.
>>
>> s/unsinged/unsigned/
> 
> Fixed.
> 
>>
>>> This patch fixes the buitin definitions and updates the testcases
>>> to use
>>
>> s/buitin/builtin/
> 
> Fixed.
> 
>>
>>> the correct arguments.
>>>
>>> gcc/ChangeLog:
>>> 	* config/rs6000/rs6000-overload.def (__builtin_vec_replace_un):
>>> 	Fix first argument type.
>>>
>>> gcc/testsuite/ChangeLog:
>>> 	* gcc.target/powerpc/ver-replace-word-runnable.c
>>> 	(vec_replace_unaligned) Fix first argument type.
>>> 	(vresult_uchar): Fix expected	results.
>>
>> Nit: unexpected tab.
> 
> Fixed.
> 
>>
>>> 	(vec_replace_unaligned): Update for loop to check uchar
>>> results.
>>> 	Remove extra spaces in if statements.
>>> 	Insert missing spaces in for statements.
>>> 	(dg-final): Update expected instruction counts.
>>> ---
>>>  gcc/config/rs6000/rs6000-overload.def         |  12 +-
>>>  .../powerpc/vec-replace-word-runnable.c       | 157 ++++++++++--
>>> ------
>>>  2 files changed, 92 insertions(+), 77 deletions(-)
>>>
>>> diff --git a/gcc/config/rs6000/rs6000-overload.def
>>> b/gcc/config/rs6000/rs6000-overload.def
>>> index c582490c084..26dc662b8fb 100644
>>> --- a/gcc/config/rs6000/rs6000-overload.def
>>> +++ b/gcc/config/rs6000/rs6000-overload.def
>>> @@ -3059,17 +3059,17 @@
>>>      VREPLACE_ELT_V2DF
>>>  
>>>  [VEC_REPLACE_UN, vec_replace_unaligned, __builtin_vec_replace_un]
>>> -  vuc __builtin_vec_replace_un (vui, unsigned int, const int);
>>> +  vuc __builtin_vec_replace_un (vuc, unsigned int, const int);
>>>      VREPLACE_UN_UV4SI
>>> -  vuc __builtin_vec_replace_un (vsi, signed int, const int);
>>> +  vuc __builtin_vec_replace_un (vuc, signed int, const int);
>>>      VREPLACE_UN_V4SI
>>> -  vuc __builtin_vec_replace_un (vull, unsigned long long, const
>>> int);
>>> +  vuc __builtin_vec_replace_un (vuc, unsigned long long, const
>>> int);
>>>      VREPLACE_UN_UV2DI
>>> -  vuc __builtin_vec_replace_un (vsll, signed long long, const
>>> int);
>>> +  vuc __builtin_vec_replace_un (vuc, signed long long, const int);
>>>      VREPLACE_UN_V2DI
>>> -  vuc __builtin_vec_replace_un (vf, float, const int);
>>> +  vuc __builtin_vec_replace_un (vuc, float, const int);
>>>      VREPLACE_UN_V4SF
>>> -  vuc __builtin_vec_replace_un (vd, double, const int);
>>> +  vuc __builtin_vec_replace_un (vuc, double, const int);
>>>      VREPLACE_UN_V2DF
>>
>> Looks good, since the given element can be replaced without aligned,
>> the given vector type don't need to match the given element, with
>> the potential implication that it can be misaligned.
>>
>>>  
>>>  [VEC_REVB, vec_revb, __builtin_vec_revb]
>>> diff --git a/gcc/testsuite/gcc.target/powerpc/vec-replace-word-
>>> runnable.c b/gcc/testsuite/gcc.target/powerpc/vec-replace-word-
>>> runnable.c
>>> index 27318822871..66b0ef58996 100644
>>> --- a/gcc/testsuite/gcc.target/powerpc/vec-replace-word-runnable.c
>>> +++ b/gcc/testsuite/gcc.target/powerpc/vec-replace-word-runnable.c
>>> @@ -20,6 +20,9 @@ main (int argc, char *argv [])
>>>    unsigned char ch;
>>>    unsigned int index;
>>>  
>>> +  vector unsigned char src_va_uchar;
>>> +  vector unsigned char expected_vresult_uchar;
>>> +
>>>    vector unsigned int vresult_uint;
>>>    vector unsigned int expected_vresult_uint;
>>>    vector unsigned int src_va_uint;
>>> @@ -64,10 +67,10 @@ main (int argc, char *argv [])
>>>  						 
>>>    vresult_uint = vec_replace_elt (src_va_uint, src_a_uint, 2);
>>>  
>>> -  if (!vec_all_eq (vresult_uint,  expected_vresult_uint)) {
>>> +  if (!vec_all_eq (vresult_uint, expected_vresult_uint)) {
>>>  #if DEBUG
>>>      printf("ERROR, vec_replace_elt (src_vb_uint, src_va_uint,
>>> index)\n");
>>> -    for(i = 0; i < 4; i++)
>>> +    for (i = 0; i < 4; i++)
>>>        printf(" vresult_uint[%d] = %d, expected_vresult_uint[%d] =
>>> %d\n",
>>>  	     i, vresult_uint[i], i, expected_vresult_uint[i]);
>>>  #else
>>> @@ -82,10 +85,10 @@ main (int argc, char *argv [])
>>>  						 
>>>    vresult_int = vec_replace_elt (src_va_int, src_a_int, 1);
>>>  
>>> -  if (!vec_all_eq (vresult_int,  expected_vresult_int)) {
>>> +  if (!vec_all_eq (vresult_int, expected_vresult_int)) {
>>>  #if DEBUG
>>>      printf("ERROR, vec_replace_elt (src_vb_int, src_va_int,
>>> index)\n");
>>> -    for(i = 0; i < 4; i++)
>>> +    for (i = 0; i < 4; i++)
>>>        printf(" vresult_int[%d] = %d, expected_vresult_int[%d] =
>>> %d\n",
>>>  	     i, vresult_int[i], i, expected_vresult_int[i]);
>>>  #else
>>> @@ -100,10 +103,10 @@ main (int argc, char *argv [])
>>>  						 
>>>    vresult_float = vec_replace_elt (src_va_float, src_a_float, 1);
>>>  
>>> -  if (!vec_all_eq (vresult_float,  expected_vresult_float)) {
>>> +  if (!vec_all_eq (vresult_float, expected_vresult_float)) {
>>>  #if DEBUG
>>>      printf("ERROR, vec_replace_elt (src_vb_float, src_va_float,
>>> index)\n");
>>> -    for(i = 0; i < 4; i++)
>>> +    for (i = 0; i < 4; i++)
>>>        printf(" vresult_float[%d] = %f, expected_vresult_float[%d]
>>> = %f\n",
>>>  	     i, vresult_float[i], i, expected_vresult_float[i]);
>>>  #else
>>> @@ -122,7 +125,7 @@ main (int argc, char *argv [])
>>>    if (!vec_all_eq (vresult_ullint,  expected_vresult_ullint)) {
>>>  #if DEBUG
>>>      printf("ERROR, vec_replace_elt (src_vb_ullint, src_va_ullint,
>>> index)\n");
>>> -    for(i = 0; i < 2; i++)
>>> +    for (i = 0; i < 2; i++)
>>>        printf(" vresult_ullint[%d] = %d,
>>> expected_vresult_ullint[%d] = %d\n",
>>>  	     i, vresult_ullint[i], i, expected_vresult_ullint[i]);
>>>  #else
>>> @@ -137,10 +140,10 @@ main (int argc, char *argv [])
>>>  						 
>>>    vresult_llint = vec_replace_elt (src_va_llint, src_a_llint, 1);
>>>  
>>> -  if (!vec_all_eq (vresult_llint,  expected_vresult_llint)) {
>>> +  if (!vec_all_eq (vresult_llint, expected_vresult_llint)) {
>>>  #if DEBUG
>>>      printf("ERROR, vec_replace_elt (src_vb_llint, src_va_llint,
>>> index)\n");
>>> -    for(i = 0; i < 2; i++)
>>> +    for (i = 0; i < 2; i++)
>>>        printf(" vresult_llint[%d] = %d, expected_vresult_llint[%d]
>>> = %d\n",
>>>  	     i, vresult_llint[i], i, expected_vresult_llint[i]);
>>>  #else
>>> @@ -155,10 +158,10 @@ main (int argc, char *argv [])
>>>  						 
>>>    vresult_double = vec_replace_elt (src_va_double, src_a_double,
>>> 1);
>>>  
>>> -  if (!vec_all_eq (vresult_double,  expected_vresult_double)) {
>>> +  if (!vec_all_eq (vresult_double, expected_vresult_double)) {
>>>  #if DEBUG
>>>      printf("ERROR, vec_replace_elt (src_vb_double, src_va_double,
>>> index)\n");
>>> -    for(i = 0; i < 2; i++)
>>> +    for (i = 0; i < 2; i++)
>>>        printf(" vresult_double[%d] = %f,
>>> expected_vresult_double[%d] = %f\n",
>>>  	     i, vresult_double[i], i, expected_vresult_double[i]);
>>>  #else
>>> @@ -169,60 +172,68 @@ main (int argc, char *argv [])
>>>  
>>>    /* Vector replace 32-bit element, unaligned */
>>>    src_a_uint = 345;
>>> -  src_va_uint = (vector unsigned int) { 1, 2, 0, 0 };
>>> -  vresult_uint = (vector unsigned int) { 0, 0, 0, 0 };
>>> +  src_va_uchar = (vector unsigned char) { 1, 0, 0, 0, 2, 0, 0, 0,
>>> +					  0, 0, 0, 0, 0, 0, 0, 0 };
>>> +  vresult_uchar = (vector unsigned char) { 0, 0, 0, 0, 0, 0, 0, 0,
>>> +					   0, 0, 0, 0, 0, 0, 0, 0 };
>>>    /* Byte index 7 will overwrite part of elements 2 and 3 */
>>> -  expected_vresult_uint = (vector unsigned int) { 1, 2, 345*256, 0
>>> };
>>> +  expected_vresult_uchar
>>> +    = (vector unsigned char) { 1, 0, 0, 0, 2, 0, 0, 0,
>>> +			       0, 0x59, 0x1, 0, 0, 0, 0, 0 };
>>>  						 
>>> -  vresult_uchar = vec_replace_unaligned (src_va_uint, src_a_uint,
>>> 3);
>>> -  vresult_uint = (vector unsigned int) vresult_uchar;
>>> +  vresult_uchar = vec_replace_unaligned (src_va_uchar, src_a_uint,
>>> 3);
>>>  
>>> -  if (!vec_all_eq (vresult_uint,  expected_vresult_uint)) {
>>> +  if (!vec_all_eq (vresult_uchar, expected_vresult_uchar)) {
>>>  #if DEBUG
>>> -    printf("ERROR, vec_replace_unaligned (src_vb_uint,
>>> src_va_uint, index)\n");
>>> -    for(i = 0; i < 4; i++)
>>> -      printf(" vresult_uint[%d] = %d, expected_vresult_uint[%d] =
>>> %d\n",
>>> -	     i, vresult_uint[i], i, expected_vresult_uint[i]);
>>> +    printf("ERROR, vec_replace_unaligned (src_va_uchar,
>>> src_va_uint, index)\n");
>>> +    for (i = 0; i < 16; i++)
>>> +      printf(" vresult_uchar[%d] = 0x%x, expected_vresult_uint[%d]
>>> = 0%x\n",
>>> +	     i, vresult_uchar[i], i, expected_vresult_uchar[i]);
>>>  #else
>>>      abort();
>>>  #endif
>>>    }
>>>  
>>>    src_a_int = 234;
>>> -  src_va_int = (vector int) { 1, 0, 3, 4 };
>>> -  vresult_int = (vector int) { 0, 0, 0, 0 };
>>> +  src_va_uchar = (vector unsigned char) { 1, 0, 0, 0, 0, 0, 0, 0,
>>> +					  3, 0, 0, 0, 4, 0, 0, 0 };
>>> +  vresult_uchar = (vector unsigned char) { 0, 0, 0, 0, 0, 0, 0, 0,
>>> +					   0, 0, 0, 0, 0, 0, 0, 0 };
>>>    /* Byte index 7 will over write part of elements 1 and 2 */
>>> -  expected_vresult_int = (vector int) { 1, 234*256, 0, 4 };
>>> -						 
>>> -  vresult_uchar = vec_replace_unaligned (src_va_int, src_a_int,
>>> 7);
>>> -  vresult_int = (vector signed int) vresult_uchar;
>>> +  expected_vresult_uchar = (vector unsigned char) { 1, 0, 0, 0, 0,
>>> 0xea, 0, 0,
>>> +						    0, 0, 0, 0, 4, 0,
>>> 0, 0 };
>>>  
>>> -  if (!vec_all_eq (vresult_int,  expected_vresult_int)) {
>>> +  vresult_uchar = vec_replace_unaligned (src_va_uchar, src_a_int,
>>> 7);
>>> +
>>> +  if (!vec_all_eq (vresult_uchar, expected_vresult_uchar)) {
>>>  #if DEBUG
>>> -    printf("ERROR, vec_replace_unaligned (src_vb_int, src_va_int,
>>> index)\n");
>>> -    for(i = 0; i < 4; i++)
>>> -      printf(" vresult_int[%d] = %d, expected_vresult_int[%d] =
>>> %d\n",
>>> -	     i, vresult_int[i], i, expected_vresult_int[i]);
>>> +    printf("ERROR, vec_replace_unaligned (src_va_uchar,
>>> src_va_int, index)\n");
>>> +    for (i = 0; i < 16; i++)
>>> +      printf(" vresult_int[%d] = 0x%x, expected_vresult_int[%d] =
>>> 0x%x\n",
>>> +	     i, vresult_uchar[i], i, expected_vresult_uchar[i]);
>>>  #else
>>>      abort();
>>>  #endif
>>>    }
>>>  
>>>    src_a_float = 34.0;
>>> -  src_va_float = (vector float) { 0.0, 10.0, 20.0, 30.0 };
>>> -  vresult_float = (vector float) { 0.0, 0.0, 0.0, 0.0 };
>>> -  expected_vresult_float = (vector float) { 0.0, 34.0, 20.0, 30.0
>>> };
>>> +  src_va_uchar = (vector unsigned char) { 0, 0, 0, 0, 0, 0, 0x41,
>>> 0xa0,
>>> +					  5, 6, 7, 8, 0x41, 0xf0, 0,
>>> 0};
>>> +  vresult_uchar = (vector unsigned char) { 0, 0, 0, 0, 0, 0, 0, 0,
>>> +					   0, 0, 0, 0, 0, 0, 0, 0 };
>>> +  expected_vresult_uchar
>>> +    = (vector unsigned char) { 0, 0, 0, 0, 0, 0, 8, 0x42,
>>> +			       5, 6, 7, 8, 0x41, 0xf0, 0, 0 };
>>>  						 
>>> -  vresult_uchar = vec_replace_unaligned (src_va_float,
>>> src_a_float, 8);
>>> -  vresult_float = (vector float) vresult_uchar;
>>> +  vresult_uchar = vec_replace_unaligned (src_va_uchar,
>>> src_a_float, 8);
>>>  
>>> -  if (!vec_all_eq (vresult_float,  expected_vresult_float)) {
>>> +  if (!vec_all_eq (vresult_uchar, expected_vresult_uchar)) {
>>>  #if DEBUG
>>> -    printf("ERROR, vec_replace_unaligned (src_vb_float,
>>> src_va_float, "
>>> +    printf("ERROR, vec_replace_unaligned (src_va_uchar,
>>> src_va_float, "
>>>  	   "index)\n");
>>> -    for(i = 0; i < 4; i++)
>>> -      printf(" vresult_float[%d] = %f, expected_vresult_float[%d]
>>> = %f\n",
>>> -	     i, vresult_float[i], i, expected_vresult_float[i]);
>>> +    for (i = 0; i < 16; i++)
>>> +      printf(" vresult_uchar[%d] = 0x%x,
>>> expected_vresult_uchar[%d] = 0x%x\n",
>>> +	     i, vresult_uchar[i], i, expected_vresult_uchar[i]);
>>>  #else
>>>      abort();
>>>  #endif
>>> @@ -230,61 +241,67 @@ main (int argc, char *argv [])
>>>  
>>>    /* Vector replace 64-bit element, unaligned  */
>>>    src_a_ullint = 456;
>>> -  src_va_ullint = (vector unsigned long long int) { 0, 0x222 };
>>> -  vresult_ullint = (vector unsigned long long int) { 0, 0 };
>>> -  expected_vresult_ullint = (vector unsigned long long int) {
>>> 456*256,
>>> -							      0x200 };
>>> +  src_va_uchar = (vector unsigned char) { 0, 0xc, 0x1, 0, 0, 0, 0,
>>> 0,
>>> +					  0x22, 0x2, 0, 0, 0, 0, 0, 0
>>> };
>>> +  vresult_uchar = (vector unsigned char) { 0, 0, 0, 0, 0, 0, 0, 0,
>>> +					   0, 0, 0, 0, 0, 0, 0, 0 };
>>> +  expected_vresult_uchar
>>> +    = (vector unsigned char) { 0, 0xc, 0x1, 0, 0, 0xc8, 1, 0,
>>> +			       0, 2, 0, 0, 0, 0, 0, 0 };
>>>  						 
>>>    /* Byte index 7 will over write least significant byte
>>> of  element 0  */
>>> -  vresult_uchar = vec_replace_unaligned (src_va_ullint,
>>> src_a_ullint, 7);
>>> -  vresult_ullint = (vector unsigned long long) vresult_uchar;
>>> +  vresult_uchar = vec_replace_unaligned (src_va_uchar,
>>> src_a_ullint, 7);
>>>  
>>> -  if (!vec_all_eq (vresult_ullint,  expected_vresult_ullint)) {
>>> +  if (!vec_all_eq (vresult_uchar, expected_vresult_uchar)) {
>>>  #if DEBUG
>>> -    printf("ERROR, vec_replace_unaligned (src_vb_ullint,
>>> src_va_ullint, "
>>> +    printf("ERROR, vec_replace_unaligned (src_va_uchar,
>>> src_va_ullint, "
>>>  	   "index)\n");
>>> -    for(i = 0; i < 2; i++)
>>> -      printf(" vresult_ullint[%d] = %d,
>>> expected_vresult_ullint[%d] = %d\n",
>>> -	     i, vresult_ullint[i], i, expected_vresult_ullint[i]);
>>> +    for (i = 0; i < 15; i++)
>>> +      printf(" vresult_uchar[%d] = 0x%x,
>>> expected_vresult_uchar[%d] = 0x%x\n",
>>> +	     i, vresult_uchar[i], i, expected_vresult_uchar[i]);
>>>  #else
>>>      abort();
>>>  #endif
>>>    }
>>>  
>>>    src_a_llint = 678;
>>> -  src_va_llint = (vector long long int) { 0, 0x101 };
>>> +  src_va_uchar = (vector unsigned char) { 0, 0xa6, 0x2, 0, 0, 0,
>>> 0, 0,
>>> +					  0x0, 0x1, 0, 0, 0, 0, 0, 0 };
>>>    vresult_llint = (vector long long int) { 0, 0 };
>>>    /* Byte index 7 will over write least significant byte
>>> of  element 0  */
>>> -  expected_vresult_llint = (vector long long int) { 678*256, 0x100
>>> };
>>> +  expected_vresult_uchar
>>> +    = (vector unsigned char) { 0x0, 0xa6, 0x2, 0x0, 0x0, 0xa6,
>>> 0x2, 0x0,
>>> +			       0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0
>>> };
>>>  						 
>>> -  vresult_uchar = vec_replace_unaligned (src_va_llint,
>>> src_a_llint, 7);
>>> -  vresult_llint = (vector signed long long) vresult_uchar;
>>> +  vresult_uchar = vec_replace_unaligned (src_va_uchar,
>>> src_a_llint, 7);
>>>  
>>> -  if (!vec_all_eq (vresult_llint,  expected_vresult_llint)) {
>>> +  if (!vec_all_eq (vresult_uchar, expected_vresult_uchar)) {
>>>  #if DEBUG
>>> -    printf("ERROR, vec_replace_unaligned (src_vb_llint,
>>> src_va_llint, "
>>> +    printf("ERROR, vec_replace_unaligned (src_va_uchar,
>>> src_va_llint, "
>>>  	   "index)\n");
>>> -    for(i = 0; i < 2; i++)
>>> -      printf(" vresult_llint[%d] = %d, expected_vresult_llint[%d]
>>> = %d\n",
>>> -	     i, vresult_llint[i], i, expected_vresult_llint[i]);
>>> +    for (i = 0; i < 16; i++)
>>> +      printf(" vresult_uchar[%d] = %d, expected_vresult_uchar[%d]
>>> = %d\n",
>>> +	     i, vresult_uchar[i], i, expected_vresult_uchar[i]);
>>>  #else
>>>      abort();
>>>  #endif
>>>    }
>>>    
>>>    src_a_double = 678.0;
>>> -  src_va_double = (vector double) { 0.0, 50.0 };
>>> +  //  src_va_double = (vector double) { 0.0, 50.0 };
>>> +  src_va_uchar = (vector unsigned char) { 0, 0, 0, 0, 0, 0, 0, 0,
>>> +					  0, 0, 0, 0, 0, 0, 0, 0 };
>>>    vresult_double = (vector double) { 0.0, 0.0 };
>>>    expected_vresult_double = (vector double) { 0.0, 678.0 };
>>>  						 
>>> -  vresult_uchar = vec_replace_unaligned (src_va_double,
>>> src_a_double, 0);
>>> +  vresult_uchar = vec_replace_unaligned (src_va_uchar,
>>> src_a_double, 0);
>>>    vresult_double = (vector double) vresult_uchar;
>>>  
>>> -  if (!vec_all_eq (vresult_double,  expected_vresult_double)) {
>>> +  if (!vec_all_eq (vresult_double, expected_vresult_double)) {
>>>  #if DEBUG
>>> -    printf("ERROR, vec_replace_unaligned (src_vb_double,
>>> src_va_double, "
>>> +    printf("ERROR, vec_replace_unaligned (src_va_uchar,
>>> src_va_double, "
>>>  	   "index)\n");
>>> -    for(i = 0; i < 2; i++)
>>> +    for (i = 0; i < 2; i++)
>>>        printf(" vresult_double[%d] = %f,
>>> expected_vresult_double[%d] = %f\n",
>>>  	     i, vresult_double[i], i, expected_vresult_double[i]);
>>>  #else
>>> @@ -295,7 +312,5 @@ main (int argc, char *argv [])
>>>    return 0;
>>>  }
>>>  
>>> -/* { dg-final { scan-assembler-times {\mvinsw\M} 6 } } */
>>> -/* { dg-final { scan-assembler-times {\mvinsd\M} 6 } } */
>>> -
>>> -
>>> +/* { dg-final { scan-assembler-times {\mvinsw\M} 8 } } */
>>> +/* { dg-final { scan-assembler-times {\mvinsd\M} 4 } } */
>>
>> Why do you have this change?  As changelog, it just updates some
>> types as the
>> prototypes change and formats, it's not clear to me why it can cause
>> the
>> expected insn count to change.
> 
> The original builtin call 
> 
>   vector unsigned char vec_replace_unligned (vector unsigned long long int, ...) 
> 
> generated the vinsd instruction for the two calls with the first
> argument of unsigned long long int.  When the first argument of the
> builtin is changed to the correct type, vector unsigned char the
> builtin generates the vinsw instruction instead.  The change occurs in
> two places resulting in reducing the counts for vinsd by two and
> increasing the counts for vinsw by two.  The other calls to the builtin
> are either vector ints or vector floats which generate the vinsw
> instruction.  Changing the first argument in those calls to vector
> unsigned char still generate the vinsw instruction.

But it did expose something odd and needed to be handled in this change.
I had a further check, for the below test case:

#include "altivec.h"

#ifdef ORIG
vector unsigned char foo (vector unsigned long long v){
  unsigned long long val = 678ull;
  return vec_replace_unaligned (v, val, 7);
}
#else
vector unsigned char foo (vector unsigned long long v){
  unsigned long long val = 678ull;
  return vec_replace_unaligned ((vector unsigned char)v, val, 7);
}
#endif

Without this patch (-DORIG required to match the previous prototype),
it would generate vinsd; while with this proposed patch, it would
generate vinsw.  I think it's unexpected since users can still have
the need to replace a doubleword size of chunk but give a constant
which can be represented by int.  The previous way can support it,
while the new way can't.  So we should have some way to distinguish
it, we have some special-casing in function
altivec_resolve_overloaded_builtin, could you have a check and try
there?  Thanks!

BR,
Kewen