Hello, James Greenhalgh <james.greenhalgh@xxxxxxx> writes: > On Tue, Oct 28, 2014 at 05:29:15AM +0000, Slava Barinov wrote: >> Hello, >> >> I work now with ARM64 CPUs and wanted to check AArch32 mode, I can see >> several mentions in GCC source code but can't find flag which switches on >> AArch32 code generation. >> >> Is it possible to make current GCC generate it? > > AArch32 is the 32-bit execution state in the ARMv8 architecture. It is > closely related to the ARMv7 architecture, which in GCC is implemented as > the "arm" target. Code generation for the AArch64 execution state of the > ARMv8 architecture is implemented as the "aarch64" target. > > GCC has a model whereby the compiler can be built for only one target at > any time, so there is no flag which will generate AArch32 code from an > AArch64 compiler. You will need a compiler built to target "arm". > > For your use case that will mean installing two cross-compilers, one for > (for example) arm-none-linux-gnueabi, and one for aarch64-none-linux-gnu. > > Thanks, > James That was the first thing I tried and it works partially. But my initial idea was to use armv8 hardware extensions like accelerated crypto engine. Will setting CPU model to armv8 in arm-none-linux-gnueabi toolchain make it possible to use all its features in 32bit code? Best Regards, Vyacheslav Barinov
