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| author | Kevin Hao <haokexin@gmail.com> | 2013-07-16 13:57:15 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-08-14 06:59:19 +0200 |
| commit | e05c0e81b0628808a7490c35d1803644a18b0405 (patch) | |
| tree | 868072fd1f5564e1d194704e0a0c88abb715f4f5 /arch/powerpc/math-emu | |
| parent | powerpc: Introduce function emulate_math() (diff) | |
| download | linux-e05c0e81b0628808a7490c35d1803644a18b0405.tar.xz linux-e05c0e81b0628808a7490c35d1803644a18b0405.zip | |
powerpc: split She math emulation into two parts
For some SoC (such as the FSL BookE) even though there does have
a hardware FPU, but not all floating point instructions are
implemented. Unfortunately some versions of gcc do use these
unimplemented instructions. Then we have to enable the math emulation
to workaround this issue. It seems a little redundant to have the
support to emulate all the floating point instructions in this case.
So split the math emulation into two parts. One is for the SoC which
doesn't have FPU at all and the other for the SoC which does have the
hardware FPU and only need some special floating point instructions to
be emulated.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/math-emu')
| -rw-r--r-- | arch/powerpc/math-emu/Makefile | 24 | ||||
| -rw-r--r-- | arch/powerpc/math-emu/math.c | 20 |
2 files changed, 26 insertions, 18 deletions
diff --git a/arch/powerpc/math-emu/Makefile b/arch/powerpc/math-emu/Makefile index 8d035d2d42a6..1b46ab4f6417 100644 --- a/arch/powerpc/math-emu/Makefile +++ b/arch/powerpc/math-emu/Makefile @@ -1,15 +1,15 @@ - -obj-$(CONFIG_MATH_EMULATION) += fabs.o fadd.o fadds.o fcmpo.o fcmpu.o \ - fctiw.o fctiwz.o fdiv.o fdivs.o \ - fmadd.o fmadds.o fmsub.o fmsubs.o \ - fmul.o fmuls.o fnabs.o fneg.o \ - fnmadd.o fnmadds.o fnmsub.o fnmsubs.o \ - fres.o fre.o frsp.o fsel.o lfs.o \ - frsqrte.o frsqrtes.o \ - fsqrt.o fsqrts.o fsub.o fsubs.o \ - mcrfs.o mffs.o mtfsb0.o mtfsb1.o \ - mtfsf.o mtfsfi.o stfiwx.o stfs.o \ - math.o fmr.o lfd.o stfd.o +math-emu-common-objs = math.o fre.o fsqrt.o fsqrts.o frsqrtes.o mtfsf.o mtfsfi.o +obj-$(CONFIG_MATH_EMULATION_HW_UNIMPLEMENTED) += $(math-emu-common-objs) +obj-$(CONFIG_MATH_EMULATION_FULL) += $(math-emu-common-objs) fabs.o fadd.o \ + fadds.o fcmpo.o fcmpu.o fctiw.o \ + fctiwz.o fdiv.o fdivs.o fmadd.o \ + fmadds.o fmsub.o fmsubs.o fmul.o \ + fmuls.o fnabs.o fneg.o fnmadd.o \ + fnmadds.o fnmsub.o fnmsubs.o fres.o \ + frsp.o fsel.o lfs.o frsqrte.o fsub.o \ + fsubs.o mcrfs.o mffs.o mtfsb0.o \ + mtfsb1.o stfiwx.o stfs.o math.o \ + fmr.o lfd.o stfd.o obj-$(CONFIG_SPE) += math_efp.o diff --git a/arch/powerpc/math-emu/math.c b/arch/powerpc/math-emu/math.c index f9ef34746f16..49eb2ac08fd3 100644 --- a/arch/powerpc/math-emu/math.c +++ b/arch/powerpc/math-emu/math.c @@ -13,6 +13,20 @@ #define FLOATFUNC(x) extern int x(void *, void *, void *, void *) +/* The instructions list which may be not implemented by a hardware FPU */ +FLOATFUNC(fre); +FLOATFUNC(frsqrtes); +FLOATFUNC(fsqrt); +FLOATFUNC(fsqrts); +FLOATFUNC(mtfsf); +FLOATFUNC(mtfsfi); + +#ifdef CONFIG_MATH_EMULATION_HW_UNIMPLEMENTED +#undef FLOATFUNC(x) +#define FLOATFUNC(x) static inline int x(void *op1, void *op2, void *op3, \ + void *op4) { } +#endif + FLOATFUNC(fadd); FLOATFUNC(fadds); FLOATFUNC(fdiv); @@ -42,8 +56,6 @@ FLOATFUNC(mcrfs); FLOATFUNC(mffs); FLOATFUNC(mtfsb0); FLOATFUNC(mtfsb1); -FLOATFUNC(mtfsf); -FLOATFUNC(mtfsfi); FLOATFUNC(lfd); FLOATFUNC(lfs); @@ -58,13 +70,9 @@ FLOATFUNC(fnabs); FLOATFUNC(fneg); /* Optional */ -FLOATFUNC(fre); FLOATFUNC(fres); FLOATFUNC(frsqrte); -FLOATFUNC(frsqrtes); FLOATFUNC(fsel); -FLOATFUNC(fsqrt); -FLOATFUNC(fsqrts); #define OP31 0x1f /* 31 */ |