Viewing file:  vect-widen-sub.c (2.15 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-O3 -save-temps" } */
#include <stdint.h>
#include <string.h>
#pragma GCC target "+nosve"
#define ARR_SIZE 1024
/* Should produce an usubl */
void usub_opt (uint32_t *foo, uint16_t *a, uint16_t *b)
{
for( int i = 0; i < ARR_SIZE - 3;i=i+4)
{
foo[i] = a[i] - b[i];
foo[i+1] = a[i+1] - b[i+1];
foo[i+2] = a[i+2] - b[i+2];
foo[i+3] = a[i+3] - b[i+3];
}
}
__attribute__((optimize (0)))
void usub_nonopt (uint32_t *foo, uint16_t *a, uint16_t *b)
{
for( int i = 0; i < ARR_SIZE - 3;i=i+4)
{
foo[i] = a[i] - b[i];
foo[i+1] = a[i+1] - b[i+1];
foo[i+2] = a[i+2] - b[i+2];
foo[i+3] = a[i+3] - b[i+3];
}
}
/* Should produce an ssubl */
void ssub_opt (int32_t *foo, int16_t *a, int16_t *b)
{
for( int i = 0; i < ARR_SIZE - 3;i=i+4)
{
foo[i] = a[i] - b[i];
foo[i+1] = a[i+1] - b[i+1];
foo[i+2] = a[i+2] - b[i+2];
foo[i+3] = a[i+3] - b[i+3];
}
}
__attribute__((optimize (0)))
void ssub_nonopt (int32_t *foo, int16_t *a, int16_t *b)
{
for( int i = 0; i < ARR_SIZE - 3;i=i+4)
{
foo[i] = a[i] - b[i];
foo[i+1] = a[i+1] - b[i+1];
foo[i+2] = a[i+2] - b[i+2];
foo[i+3] = a[i+3] - b[i+3];
}
}
void __attribute__((optimize (0)))
init(uint16_t *a, uint16_t *b)
{
for( int i = 0; i < ARR_SIZE;i++)
{
a[i] = i;
b[i] = 2*i;
}
}
int __attribute__((optimize (0)))
main()
{
uint32_t foo_arr[ARR_SIZE];
uint32_t bar_arr[ARR_SIZE];
uint16_t a[ARR_SIZE];
uint16_t b[ARR_SIZE];
init(a, b);
usub_opt(foo_arr, a, b);
usub_nonopt(bar_arr, a, b);
if (memcmp(foo_arr, bar_arr, ARR_SIZE) != 0)
return 1;
ssub_opt((int32_t*) foo_arr, (int16_t*) a, (int16_t*) b);
ssub_nonopt((int32_t*) bar_arr, (int16_t*) a, (int16_t*) b);
if (memcmp(foo_arr, bar_arr, ARR_SIZE) != 0)
return 1;
return 0;
}
/* { dg-final { scan-assembler-times {\tusubl\t} 1} } */
/* { dg-final { scan-assembler-times {\tusubl2\t} 1} } */
/* { dg-final { scan-assembler-times {\tssubl\t} 1} } */
/* { dg-final { scan-assembler-times {\tssubl2\t} 1} } */
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