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luajit: patch: PPC/e500 SPE: use soft float instead of failing 

makes LuaJit builds for mpc85xx targets with SPE ISA extension
enabled possible

Quoting inner commit message:

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>
This commit is contained in:
Šimon Bořek 2022-07-16 18:56:32 +02:00 committed by Rosen Penev
parent 203a429951
commit a4a484fbca
1 changed files with 58 additions and 0 deletions
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58
lang/luajit/patches/300-PPC-e500-with-SPE-enabled-use-soft-float.patch Normal file
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@ -0,0 +1,58 @@
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"