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- From 2c8b9d5807a515a0ff859899065f512beabcbaed Mon Sep 17 00:00:00 2001
- From: =?UTF-8?q?=C5=A0imon=20Bo=C5=99ek?= <simon.borek@nic.cz>
- Date: Sat, 16 Jul 2022 18:39:55 +0200
- Subject: [PATCH] PPC/e500 with SPE enabled: use soft float instead of failing
- MIME-Version: 1.0
- Content-Type: text/plain; charset=UTF-8
- Content-Transfer-Encoding: 8bit
-
- This allows building LuaJit for systems with Power ISA SPE
- extension[^1] support by using soft float on LuaJit side.
-
- While e500 CPU cores support SPE instruction set extension
- allowing them to perform floating point arithmetic natively,
- this isn't required. They can function with software floating
- point to integer arithmetic translation as well,
- just like FPU-less PowerPC CPUs without SPE support.
-
- Therefore I see no need to prevent them from running LuaJit
- explicitly.
-
- [^1]: https://www.nxp.com/docs/en/reference-manual/SPEPEM.pdf
-
- Signed-off-by: Pali Rohár <pali@kernel.org>
- Signed-off-by: Šimon Bořek <simon.borek@nic.cz>
- ---
- src/lj_arch.h | 7 ++-----
- 1 file changed, 2 insertions(+), 5 deletions(-)
-
- --- a/src/lj_arch.h
- +++ b/src/lj_arch.h
- @@ -256,7 +256,7 @@
- #define LJ_ARCH_NAME "ppc"
-
- #if !defined(LJ_ARCH_HASFPU)
- -#if defined(_SOFT_FLOAT) || defined(_SOFT_DOUBLE)
- +#if defined(_SOFT_FLOAT) || defined(_SOFT_DOUBLE) || defined(__NO_FPRS__)
- #define LJ_ARCH_HASFPU 0
- #else
- #define LJ_ARCH_HASFPU 1
- @@ -264,7 +264,7 @@
- #endif
-
- #if !defined(LJ_ABI_SOFTFP)
- -#if defined(_SOFT_FLOAT) || defined(_SOFT_DOUBLE)
- +#if defined(_SOFT_FLOAT) || defined(_SOFT_DOUBLE) || defined(__NO_FPRS__)
- #define LJ_ABI_SOFTFP 1
- #else
- #define LJ_ABI_SOFTFP 0
- @@ -442,9 +442,6 @@
- #if LJ_ARCH_PPC64
- #error "No support for PowerPC 64 bit mode (yet)"
- #endif
- -#if defined(__NO_FPRS__) && !defined(_SOFT_FLOAT)
- -#error "No support for PPC/e500 anymore (use LuaJIT 2.0)"
- -#endif
- #elif LJ_TARGET_MIPS32
- #if !((defined(_MIPS_SIM_ABI32) && _MIPS_SIM == _MIPS_SIM_ABI32) || (defined(_ABIO32) && _MIPS_SIM == _ABIO32))
- #error "Only o32 ABI supported for MIPS32"
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