Hope d has great development in Raspberry Pi
Dan Olson via digitalmars-d-ldc
digitalmars-d-ldc at puremagic.com
Sun Jan 31 14:17:43 PST 2016
Dan Olson <gorox at comcast.net> writes:
> Ironically, Fibers do work with optimize compile. Something does wrong
> with -O0, some bad codegen in spots.
> Simple phobos hello world works, just make sure you give -O to enable
Picking away at LDC on arm-linux.
I am assuming that very few folks are trying LDC with target
arm-unknown-linux-gnueabihf because LLVM really has a problem with
simple global variables (__gshared). It is not LDC, but LLVM. The
codegen to load a simple global variable is all wrong with optimizer
// load x into a register
ldr r0, .LCPI0_0
ldr r0, [r0]
ldr r0, [r0] // what?! an extra load? SEGV!
// elsewhere, x is defined as
Clang is ok at -O0. But if I take clang IR output (-emit-llvm) and
generate code with llc -O0, it too has extra ldr instruction. Clang
must be adding some optimization passes at -O0 that are different than
llc -O0. I think LDC uses same passes as llc, so there is the problem.
Next, see if LLVM has a bug filed for this and find that extra
optimization pass for LDC.
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