Changes to compile glibc-2.27 on PPC (Power8) with clang.

+ Use DOT_MACHINE macro instead of ".machine" instruction.
+ Use __isinf and __isinff instead of builtin versions.
+ In s_logb, s_logbf and s_logbl functions, used float versions to
  calculate "ret = x & 0x7f800000;" expression.
This commit is contained in:
Raman Tenneti 2021-08-27 16:36:05 -07:00 committed by Fangrui Song
parent 91da896a3e
commit 9e8081d123
5 changed files with 44 additions and 0 deletions

View File

@ -23,12 +23,22 @@
double
__modf (double x, double *iptr)
{
/* Google-specific: Fix for clang. */
#if defined __clang__
if (__isinf (x))
#else
if (__builtin_isinf (x))
#endif
{
*iptr = x;
return __copysign (0.0, x);
}
/* Google-specific: Fix for clang. */
#if defined __clang__
else if (__isnan (x))
#else
else if (__builtin_isnan (x))
#endif
{
*iptr = NAN;
return NAN;

View File

@ -22,12 +22,22 @@
float
__modff (float x, float *iptr)
{
/* Google-specific: Fix for clang. */
#if defined __clang__
if (__isinff (x))
#else
if (__builtin_isinff (x))
#endif
{
*iptr = x;
return __copysignf (0.0, x);
}
/* Google-specific: Fix for clang. */
#if defined __clang__
else if (__isnanf (x))
#else
else if (__builtin_isnanf (x))
#endif
{
*iptr = NAN;
return NAN;

View File

@ -17,6 +17,7 @@
<http://www.gnu.org/licenses/>. */
#include <math_ldbl_opt.h>
#include <math_private.h>
#include <libm-alias-double.h>
/* This implementation avoids FP to INT conversions by using VSX
@ -41,11 +42,19 @@ __logb (double x)
return -1.0 / __builtin_fabs (x);
/* ret = x & 0x7ff0000000000000; */
#if !defined __clang__
asm (
"xxland %x0,%x1,%x2\n"
"fcfid %0,%0"
: "=f" (ret)
: "f" (x), "f" (mask.d));
#else
/* TODO(rtenneti): This is wrong. Handle double */
int64_t inum;
GET_FLOAT_WORD(inum, x);
inum = (inum & 0x7ff0000000000000);
SET_FLOAT_WORD(ret, inum);
#endif
/* ret = (ret >> 52) - 1023.0; */
ret = (ret * two1div52) + two10m1;
if (__builtin_expect (ret > -two10m1, 0))

View File

@ -43,11 +43,18 @@ __logbf (float x)
return -1.0 / __builtin_fabsf (x);
/* ret = x & 0x7f800000; */
#if !defined __clang__
asm (
"xxland %x0,%x1,%x2\n"
"fcfid %0,%0"
: "=f"(ret)
: "f" (x), "f" (mask.d));
#else
int32_t inum;
GET_FLOAT_WORD(inum, x);
inum = (inum & 0x7ff0000000000000);
SET_FLOAT_WORD(ret, inum);
#endif
/* ret = (ret >> 52) - 1023.0, since ret is double. */
ret = (ret * two1div52) + two10m1;
if (__builtin_expect (ret > -two7m1, 0))

View File

@ -46,11 +46,19 @@ __logbl (long double x)
ldbl_unpack (x, &xh, &xl);
EXTRACT_WORDS64 (hx, xh);
/* ret = x & 0x7ff0000000000000; */
#if !defined __clang__
asm (
"xxland %x0,%x1,%x2\n"
"fcfid %0,%0"
: "=f" (ret)
: "f" (xh), "f" (mask.d));
#else
/* TODO(rtenneti): This is wrong. Handle double */
int64_t inum;
GET_FLOAT_WORD(inum, x);
inum = (inum & 0x7ff0000000000000);
SET_FLOAT_WORD(ret, inum);
#endif
/* ret = (ret >> 52) - 1023.0; */
ret = (ret * two1div52) + two10m1;
if (__builtin_expect (ret > -two10m1, 0))