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Bring arch.h in line with upstream webrtc

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Largely to bring in preprocessor support for additional architectures as
based on 6215ba804eb500f3e28b39088c73af3c4f4cd10a by
Timothy Gu <timothygu99@gmail.com>:

Add preprocessor support for additional architectures

- _M_ARM is used by Microsoft [1]
- __riscv and __riscv_xlen are defined by [2]
- __sparc and __sparc__ are documented at [3]
- __MIPSEB__, __PPC__, __PPC64__ are documented at [3] and used in
  Chromium's build/build_config.h [4]
  Note: Chromium assumes that all PowerPC architectures are 64-bit. This
  is in fact not true.

[1]: https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=msvc-160
[2]: feca479356 (cc-preprocessor-definitions)
[3]: https://sourceforge.net/p/predef/wiki/Architectures/
[4]: https://source.chromium.org/chromium/chromium/src/+/master:build/build_config.h;drc=e12bf2e5ff1eacb9aca3e9a26bdeebdbdad5965a
This commit is contained in:
Ben Brown 2022-06-21 08:55:37 +01:00 committed by Arun Raghavan
parent 8e258a1933
commit f89958d824
1 changed files with 33 additions and 11 deletions
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44
webrtc/rtc_base/system/arch.h
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@ -15,8 +15,9 @@
#define RTC_BASE_SYSTEM_ARCH_H_
// Processor architecture detection. For more info on what's defined, see:
// http://msdn.microsoft.com/en-us/library/b0084kay.aspx
// http://www.agner.org/optimize/calling_conventions.pdf
// https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros
// https://www.agner.org/optimize/calling_conventions.pdf
// https://sourceforge.net/p/predef/wiki/Architectures/
// or with gcc, run: "echo | gcc -E -dM -"
#if defined(_M_X64) || defined(__x86_64__)
#define WEBRTC_ARCH_X86_FAMILY
@ -27,29 +28,50 @@
#define WEBRTC_ARCH_ARM_FAMILY
#define WEBRTC_ARCH_64_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(__riscv) || defined(__riscv__)
#define WEBRTC_ARCH_LITTLE_ENDIAN
#if __riscv_xlen == 64
#define WEBRTC_ARCH_64_BITS
#else
#define WEBRTC_ARCH_32_BITS
#endif
#elif defined(_M_IX86) || defined(__i386__)
#define WEBRTC_ARCH_X86_FAMILY
#define WEBRTC_ARCH_X86
#define WEBRTC_ARCH_32_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(__ARMEL__)
#elif defined(_M_ARM) || defined(__ARMEL__)
#define WEBRTC_ARCH_ARM_FAMILY
#define WEBRTC_ARCH_32_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(__MIPSEL__)
#elif defined(__MIPSEL__) || defined(__MIPSEB__)
#define WEBRTC_ARCH_MIPS_FAMILY
#if defined(__LP64__)
#define WEBRTC_ARCH_64_BITS
#else
#define WEBRTC_ARCH_32_BITS
#endif
#if defined(__MIPSEL__)
#define WEBRTC_ARCH_LITTLE_ENDIAN
#else
#define WEBRTC_ARCH_BIG_ENDIAN
#endif
#elif defined(__PPC__)
#if defined(__PPC64__)
#define WEBRTC_ARCH_64_BITS
#else
#define WEBRTC_ARCH_32_BITS
#endif
#if defined(__LITTLE_ENDIAN__)
#define WEBRTC_ARCH_LITTLE_ENDIAN
#else
#define WEBRTC_ARCH_BIG_ENDIAN
#endif
#elif defined(__sparc) || defined(__sparc__)
#if __SIZEOF_LONG__ == 8
#define WEBRTC_ARCH_64_BITS
#else
#define WEBRTC_ARCH_32_BITS
#endif
#define WEBRTC_ARCH_BIG_ENDIAN
#elif defined(__riscv) && __riscv_xlen == 64
#define WEBRTC_ARCH_64_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(__riscv) && __riscv_xlen == 32
#define WEBRTC_ARCH_32_BITS
#define WEBRTC_ARCH_LITTLE_ENDIAN
#elif defined(__pnacl__)
#define WEBRTC_ARCH_32_BITS