598e882ee8
Summary: Currently we dispatch the writing mode off of a runtime enum passed in by the constructor. This causes very unfortunate codegen for the GPU targets where we get worst-case codegen because of the unused function pointer for `sprintf`. Instead, this patch moves all of this to a template so it can be masked out. This results in no dynamic stack and uses 60 VGPRs instead of 117. It also compiles about 5x as fast.
129 lines
5.0 KiB
JSON
129 lines
5.0 KiB
JSON
{
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"errno": {
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"LIBC_CONF_ERRNO_MODE": {
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"value": "LIBC_ERRNO_MODE_DEFAULT",
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"doc": "The implementation used for errno, acceptable values are LIBC_ERRNO_MODE_DEFAULT, LIBC_ERRNO_MODE_UNDEFINED, LIBC_ERRNO_MODE_THREAD_LOCAL, LIBC_ERRNO_MODE_SHARED, LIBC_ERRNO_MODE_EXTERNAL, and LIBC_ERRNO_MODE_SYSTEM."
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}
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},
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"printf": {
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"LIBC_CONF_PRINTF_DISABLE_FLOAT": {
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"value": false,
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"doc": "Disable printing floating point values in printf and friends."
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},
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"LIBC_CONF_PRINTF_DISABLE_INDEX_MODE": {
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"value": false,
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"doc": "Disable index mode in the printf format string."
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},
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"LIBC_CONF_PRINTF_DISABLE_WRITE_INT": {
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"value": false,
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"doc": "Disable handling of %n in printf format string."
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},
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"LIBC_CONF_PRINTF_FLOAT_TO_STR_USE_MEGA_LONG_DOUBLE_TABLE": {
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"value": false,
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"doc": "Use large table for better printf long double performance."
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},
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"LIBC_CONF_PRINTF_FLOAT_TO_STR_USE_DYADIC_FLOAT": {
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"value": false,
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"doc": "Use dyadic float for faster and smaller but less accurate printf doubles."
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},
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"LIBC_CONF_PRINTF_FLOAT_TO_STR_NO_SPECIALIZE_LD": {
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"value": false,
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"doc": "Use the same mode for double and long double in printf."
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},
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"LIBC_CONF_PRINTF_FLOAT_TO_STR_USE_FLOAT320": {
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"value": false,
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"doc": "Use an alternative printf float implementation based on 320-bit floats"
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},
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"LIBC_CONF_PRINTF_DISABLE_FIXED_POINT": {
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"value": false,
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"doc": "Disable printing fixed point values in printf and friends."
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},
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"LIBC_CONF_PRINTF_DISABLE_STRERROR": {
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"value": false,
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"doc": "Disable handling of %m to print strerror in printf and friends."
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},
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"LIBC_CONF_PRINTF_RUNTIME_DISPATCH": {
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"value": true,
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"doc": "Use dynamic dispatch for the output mechanism to reduce code size."
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}
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},
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"scanf": {
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"LIBC_CONF_SCANF_DISABLE_FLOAT": {
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"value": false,
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"doc": "Disable parsing floating point values in scanf and friends."
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},
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"LIBC_CONF_SCANF_DISABLE_INDEX_MODE": {
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"value": false,
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"doc": "Disable index mode in the scanf format string."
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}
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},
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"string": {
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"LIBC_CONF_STRING_UNSAFE_WIDE_READ": {
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"value": false,
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"doc": "Read more than a byte at a time to perform byte-string operations like strlen."
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},
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"LIBC_CONF_MEMSET_X86_USE_SOFTWARE_PREFETCHING": {
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"value": false,
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"doc": "Inserts prefetch for write instructions (PREFETCHW) for memset on x86 to recover performance when hardware prefetcher is disabled."
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}
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},
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"codegen": {
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"LIBC_CONF_KEEP_FRAME_POINTER": {
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"value": true,
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"doc": "Keep frame pointer in functions for better debugging experience."
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},
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"LIBC_CONF_ENABLE_STRONG_STACK_PROTECTOR": {
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"value": true,
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"doc": "Enable -fstack-protector-strong to defend against stack smashing attack."
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}
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},
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"pthread": {
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"LIBC_CONF_TIMEOUT_ENSURE_MONOTONICITY": {
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"value": true,
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"doc": "Automatically adjust timeout to CLOCK_MONOTONIC (default to true). POSIX API may require CLOCK_REALTIME, which can be unstable and leading to unexpected behavior. This option will convert the real-time timestamp to monotonic timestamp relative to the time of call."
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},
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"LIBC_CONF_RAW_MUTEX_DEFAULT_SPIN_COUNT": {
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"value": 100,
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"doc": "Default number of spins before blocking if a mutex is in contention (default to 100)."
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},
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"LIBC_CONF_RWLOCK_DEFAULT_SPIN_COUNT": {
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"value": 100,
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"doc": "Default number of spins before blocking if a rwlock is in contention (default to 100)."
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}
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},
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"math": {
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"LIBC_CONF_MATH_OPTIMIZATIONS": {
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"value": 0,
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"doc": "Configures optimizations for math functions. Values accepted are LIBC_MATH_SKIP_ACCURATE_PASS, LIBC_MATH_SMALL_TABLES, LIBC_MATH_NO_ERRNO, LIBC_MATH_NO_EXCEPT, and LIBC_MATH_FAST."
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},
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"LIBC_CONF_FREXP_INF_NAN_EXPONENT": {
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"value": "",
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"doc": "The value written back to the second parameter when calling frexp/frexpf/frexpl` with `+/-Inf`/`NaN` is unspecified. Configue an explicit exp value for Inf/NaN inputs."
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}
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},
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"qsort": {
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"LIBC_CONF_QSORT_IMPL": {
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"value": "LIBC_QSORT_QUICK_SORT",
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"doc": "Configures sorting algorithm for qsort and qsort_r. Values accepted are LIBC_QSORT_QUICK_SORT, LIBC_QSORT_HEAP_SORT."
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}
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},
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"setjmp": {
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"LIBC_CONF_SETJMP_AARCH64_RESTORE_PLATFORM_REGISTER": {
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"value": true,
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"doc": "Make setjmp save the value of x18, and longjmp restore it. The AArch64 ABI delegates this register to platform ABIs, which can choose whether to make it caller-saved."
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}
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},
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"time": {
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"LIBC_CONF_TIME_64BIT": {
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"value": false,
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"doc": "Force the size of time_t to 64 bits, even on platforms where compatibility considerations would otherwise make it 32-bit."
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}
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},
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"general": {
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"LIBC_ADD_NULL_CHECKS": {
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"value": true,
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"doc": "Add nullptr checks in the library's implementations to some functions for which passing nullptr is undefined behavior."
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}
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}
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}
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