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Cygwin: crt: Add "volatile" to all inline assembly snippets under math

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On 32 bit x86, clang seems to miss loading input parameters based
on asm constraints for inline assembly that uses the x87 floating
registers, unless the snippet has got the volatile keyword.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2020-08-30 14:12:48 +02:00 committed by Corinna Vinschen
parent 0e6690a92c
commit 023ddc4128
11 changed files with 21 additions and 15 deletions
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3
winsup/cygwin/math/acosl.c
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@ -10,7 +10,8 @@ long double acosl (long double x)
long double res = 0.0L;
/* acosl = atanl (sqrtl(1 - x^2) / x) */
asm ( "fld %%st\n\t"
asm volatile (
"fld %%st\n\t"
"fmul %%st(0)\n\t" /* x^2 */
"fld1\n\t"
"fsubp\n\t" /* 1 - x^2 */

3
winsup/cygwin/math/asinl.c
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@ -16,7 +16,8 @@ long double asinl (long double x)
{
long double res = 0.0L;
asm ( "fld %%st\n\t"
asm volatile (
"fld %%st\n\t"
"fmul %%st(0)\n\t" /* x^2 */
"fld1\n\t"
"fsubp\n\t" /* 1 - x^2 */

2
winsup/cygwin/math/atan2l.c
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@ -9,6 +9,6 @@ long double
atan2l (long double y, long double x)
{
long double res = 0.0L;
asm ("fpatan" : "=t" (res) : "u" (y), "0" (x) : "st(1)");
asm volatile ("fpatan" : "=t" (res) : "u" (y), "0" (x) : "st(1)");
return res;
}

3
winsup/cygwin/math/atanl.c
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@ -10,7 +10,8 @@ atanl (long double x)
{
long double res = 0.0L;
asm ("fld1\n\t"
asm volatile (
"fld1\n\t"
"fpatan"
: "=t" (res) : "0" (x));
return res;

3
winsup/cygwin/math/exp.def.h
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@ -52,7 +52,8 @@ static long double
__expl_internal (long double x)
{
long double res = 0.0L;
asm ("fldl2e\n\t" /* 1 log2(e) */
asm volatile (
"fldl2e\n\t" /* 1 log2(e) */
"fmul %%st(1),%%st\n\t" /* 1 x log2(e) */
#ifdef __x86_64__

2
winsup/cygwin/math/fabsl.c
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@ -10,7 +10,7 @@ fabsl (long double x)
{
#if defined(__x86_64__) || defined(_AMD64_) || defined(__i386__) || defined(_X86_)
long double res = 0.0L;
asm ("fabs;" : "=t" (res) : "0" (x));
asm volatile ("fabs;" : "=t" (res) : "0" (x));
return res;
#elif defined(__arm__) || defined(_ARM_)
return __builtin_fabsl (x);

3
winsup/cygwin/math/fmodl.c
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@ -10,7 +10,8 @@ fmodl (long double x, long double y)
{
long double res = 0.0L;
asm ("1:\tfprem\n\t"
asm volatile (
"1:\tfprem\n\t"
"fstsw %%ax\n\t"
"sahf\n\t"
"jp 1b\n\t"

3
winsup/cygwin/math/logbl.c
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@ -16,7 +16,8 @@ logbl (long double x)
{
long double res = 0.0L;
asm ("fxtract\n\t"
asm volatile (
"fxtract\n\t"
"fstp %%st" : "=t" (res) : "0" (x));
return res;
}

4
winsup/cygwin/math/modfl.c
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@ -13,7 +13,7 @@ modfl (long double value, long double* iptr)
long double int_part = 0.0L;
/* truncate */
#if defined(_AMD64_) || defined(__x86_64__)
asm ("subq $8, %%rsp\n"
asm volatile ("subq $8, %%rsp\n"
"fnstcw 4(%%rsp)\n"
"movzwl 4(%%rsp), %%eax\n"
"orb $12, %%ah\n"
@ -23,7 +23,7 @@ modfl (long double value, long double* iptr)
"fldcw 4(%%rsp)\n"
"addq $8, %%rsp\n" : "=t" (int_part) : "0" (value) : "eax"); /* round */
#elif defined(_X86_) || defined(__i386__)
asm ("push %%eax\n\tsubl $8, %%esp\n"
asm volatile ("push %%eax\n\tsubl $8, %%esp\n"
"fnstcw 4(%%esp)\n"
"movzwl 4(%%esp), %%eax\n"
"orb $12, %%ah\n"

6
winsup/cygwin/math/pow.def.h
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@ -82,7 +82,7 @@ internal_modf (__FLT_TYPE value, __FLT_TYPE *iptr)
/* truncate */
/* truncate */
#ifdef __x86_64__
asm ("pushq %%rax\n\tsubq $8, %%rsp\n"
asm volatile ("pushq %%rax\n\tsubq $8, %%rsp\n"
"fnstcw 4(%%rsp)\n"
"movzwl 4(%%rsp), %%eax\n"
"orb $12, %%ah\n"
@ -92,7 +92,7 @@ internal_modf (__FLT_TYPE value, __FLT_TYPE *iptr)
"fldcw 4(%%rsp)\n"
"addq $8, %%rsp\npopq %%rax" : "=t" (int_part) : "0" (value)); /* round */
#else
asm ("push %%eax\n\tsubl $8, %%esp\n"
asm volatile ("push %%eax\n\tsubl $8, %%esp\n"
"fnstcw 4(%%esp)\n"
"movzwl 4(%%esp), %%eax\n"
"orb $12, %%ah\n"
@ -204,7 +204,7 @@ __FLT_ABI(pow) (__FLT_TYPE x, __FLT_TYPE y)
}
if (y == __FLT_CST(0.5))
{
asm ("fsqrt" : "=t" (rslt) : "0" (x));
asm volatile ("fsqrt" : "=t" (rslt) : "0" (x));
return rslt;
}
}

4
winsup/cygwin/math/sqrt.def.h
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@ -50,7 +50,7 @@
* asm ("fsqrts %[dst], %[src];\n" : [dst] "=w" (res) : [src] "w" (x));
*/
__FLT_TYPE __fsqrt_internal( __FLT_TYPE x );
asm(".def __fsqrt_internal; .scl 2; .type 32; .endef\n"
asm volatile(".def __fsqrt_internal; .scl 2; .type 32; .endef\n"
"\t.text\n"
"\t.align 4\n"
"\t.globl __fsqrt_internal\n"
@ -85,7 +85,7 @@ __FLT_ABI (sqrt) (__FLT_TYPE x)
#if defined(__arm__) || defined(_ARM_)
__fsqrt_internal(x);
#elif defined(_X86_) || defined(__i386__) || defined(_AMD64_) || defined(__x86_64__)
asm ("fsqrt" : "=t" (res) : "0" (x));
asm volatile ("fsqrt" : "=t" (res) : "0" (x));
#else
#error Not supported on your platform yet
#endif