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[flang] AArch64: Set flushing mode for subnormals on glibc and bionic based systems 

Signed-off-by: Paul Osmialowski <pawel.osmialowski@arm.com>

Original-commit: flang-compiler/f18@4881e3a91c
Reviewed-on: https://github.com/flang-compiler/f18/pull/397
This commit is contained in:
Paul Osmialowski 2019-04-10 12:38:36 +01:00
parent b6fbf84580
commit ebd3759f64
1 changed files with 18 additions and 0 deletions
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18
flang/lib/evaluate/host.cc
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@ -42,6 +42,24 @@ void HostFloatingPointEnvironment::SetUpHostFloatingPointEnvironment(
currentFenv_.__mxcsr &= ~0x8000; // result
currentFenv_.__mxcsr &= ~0x0040; // operands
}
#elif defined(__aarch64__)
#if defined(__GNU_LIBRARY__)
if (context.flushSubnormalsToZero()) {
currentFenv_.__fpcr |= (1U << 24); // control register
} else {
currentFenv_.__fpcr &= ~(1U << 24); // control register
}
#elif defined(__BIONIC__)
if (context.flushSubnormalsToZero()) {
currentFenv_.__control |= (1U << 24); // control register
} else {
currentFenv_.__control &= ~(1U << 24); // control register
}
#else
// TODO other C libraries on AArch64
context.messages().Say(
"TODO: flushing mode for subnormals is not set for this host architecture due to incompatible C library it uses"_en_US);
#endif
#else
// TODO other architectures
context.messages().Say(