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Fix CPU_ProbeARMv7 for Clang (GH #844) 

This fixes the probe undr Clang. However, we need to fix the CPU_QueryARMv7
pull/853/head
Jeffrey Walton 2019-05-20 21:41:57 -04:00
parent c0cff24953
commit a164c1f41d
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GPG Key ID: B36AB348921B1838
1 changed files with 27 additions and 11 deletions
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38
neon_simd.cpp
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@ -49,12 +49,9 @@ extern "C" {
bool CPU_ProbeARMv7()
{
#if defined(__aarch32__) || defined(__aarch64__)
return true;
#elif defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
return false;
#elif (CRYPTOPP_ARM_NEON_AVAILABLE)
# if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
#elif defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
volatile bool result = true;
__try
{
@ -66,7 +63,7 @@ bool CPU_ProbeARMv7()
return false;
}
return result;
# elif defined(__arm__) && (__ARM_ARCH >= 7)
#elif defined(__GNUC__) || defined(__clang__)
// longjmp and clobber warnings. Volatile is required.
// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
volatile bool result = true;
@ -83,20 +80,39 @@ bool CPU_ProbeARMv7()
result = false;
else
{
#if 0
// ARMv7 added movt and movw
int a;
asm volatile("movw %0,%1 \n"
"movt %0,%1 \n"
: "=r"(a) : "i"(0x1234));
"movt %0,%1 \n"
: "=r"(a) : "i"(0x1234));
00000010 <_Z5test2v>: // ARM
10: e3010234 movw r0, #4660 ; 0x1234
14: e3410234 movt r0, #4660 ; 0x1234
18: e12fff1e bx lr
0000001c <_Z5test3v>: // Thumb
1c: f241 2034 movw r0, #4660 ; 0x1234
20: f2c1 2034 movt r0, #4660 ; 0x1234
24: e12fff1e bx lr
#endif
int a;
asm volatile (
".arm \n\t"
".inst 0xe3010234 \n\t" // movw r0, 0x1234
".inst 0xe3410234 \n\t" // movt r0, 0x1234
"mov %0, r0 \n\t" // mov [a], r0
: "=r" (a) : : "r0");
result = (a == 0x12341234);
}
sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
signal(SIGILL, oldHandler);
return result;
# else
return false;
# endif
#else
return false;
#endif // CRYPTOPP_ARM_NEON_AVAILABLE