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Implement jl_cpu_pause on PPC64 #49573

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Implement jl_cpu_pause on PPC64 #49573

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3b8ac0e
Implement jl_cpu_pause on PPC64
vchuravy Apr 29, 2023
676fe38
fixup! Implement jl_cpu_pause on PPC64
vchuravy Apr 29, 2023
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6 changes: 6 additions & 0 deletions src/ccall.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1534,6 +1534,12 @@ static jl_cgval_t emit_ccall(jl_codectx_t &ctx, jl_value_t **args, size_t nargs)
ctx.builder.CreateCall(pauseinst);
JL_GC_POP();
return ghostValue(ctx, jl_nothing_type);
} else if (ctx.emission_context.TargetTriple.isPPC64()) {
auto hintinst = InlineAsm::get(FunctionType::get(getVoidTy(ctx.builder.getContext()), false), "or 27,27,27",
"~{memory}", true);
ctx.builder.CreateCall(hintinst);
JL_GC_POP();
return ghostValue(ctx, jl_nothing_type);
} else if (ctx.emission_context.TargetTriple.isAArch64()
|| (ctx.emission_context.TargetTriple.isARM()
&& ctx.emission_context.TargetTriple.getSubArch() != Triple::SubArchType::NoSubArch
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4 changes: 4 additions & 0 deletions src/julia_threads.h
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Expand Up @@ -300,6 +300,10 @@ JL_DLLEXPORT void *jl_get_ptls_states(void);
# define jl_cpu_pause() __asm__ volatile ("wfe" ::: "memory")
# define jl_cpu_wake() __asm__ volatile ("sev" ::: "memory")
# define JL_CPU_WAKE_NOOP 0
#elif defined(_CPU_PPC64_)
# define jl_cpu_pause() __asm__ volatile ("or 27,27,27" ::: "memory")
# define jl_cpu_wake() ((void)0)
# define JL_CPU_WAKE_NOOP 1
#else
# define jl_cpu_pause() ((void)0)
# define jl_cpu_wake() ((void)0)
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