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Diffstat (limited to 'doc/develop/global_data.rst')
| -rw-r--r-- | doc/develop/global_data.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/develop/global_data.rst b/doc/develop/global_data.rst index 2ac893de491..d143f27eedd 100644 --- a/doc/develop/global_data.rst +++ b/doc/develop/global_data.rst @@ -36,6 +36,11 @@ On most architectures the global data pointer is stored in a register. The sandbox, x86_64, and Xtensa are notable exceptions. +Current implementation uses a register for the GD pointer because this results +in smaller code. However, using plain global data for the GD pointer would be +possible too (and simpler, as it does not require the reservation of a specific +register for it), but the resulting code is bigger. + Clang for ARM does not support assigning a global register. When using Clang gd is defined as an inline function using assembly code. This adds a few bytes to the code size. |