diff options
| author | nwhitehorn <nwhitehorn@FreeBSD.org> | 2013-11-17 05:03:15 +0000 |
|---|---|---|
| committer | nwhitehorn <nwhitehorn@FreeBSD.org> | 2013-11-17 05:03:15 +0000 |
| commit | dd584b8bb2098094ce462a884d36408579e4e3e5 (patch) | |
| tree | 1e1805d2858f6290e5a8cd8ddd9bf0f9bca95801 /sys/powerpc/fpu/fpu_emu.c | |
| parent | 81f8c91220bc2cab187e212c302077ec2abec0e0 (diff) | |
| download | FreeBSD-src-dd584b8bb2098094ce462a884d36408579e4e3e5.zip FreeBSD-src-dd584b8bb2098094ce462a884d36408579e4e3e5.tar.gz | |
Make single precision floating point arithmetic actually work -- I think
it never did -- and fix an obvious missing line. Floating point emulation
on Book-E still needs some work but this gets it basically functional on
soft-FPU systems (hard FPU for Book-E is not yet implemented).
MFC after: 1 week
Diffstat (limited to 'sys/powerpc/fpu/fpu_emu.c')
| -rw-r--r-- | sys/powerpc/fpu/fpu_emu.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/sys/powerpc/fpu/fpu_emu.c b/sys/powerpc/fpu/fpu_emu.c index 66cc215..49dc758 100644 --- a/sys/powerpc/fpu/fpu_emu.c +++ b/sys/powerpc/fpu/fpu_emu.c @@ -606,9 +606,11 @@ fpu_execute(struct trapframe *tf, struct fpemu *fe, union instr *insn) rb = instr.i_a.i_frb; rc = instr.i_a.i_frc; - type = FTYPE_SNG; - if (instr.i_any.i_opcd & 0x4) - type = FTYPE_DBL; + /* + * All arithmetic operations work on registers, which + * are stored as doubles. + */ + type = FTYPE_DBL; switch ((unsigned int)instr.i_a.i_xo) { case OPC59_FDIVS: FPU_EMU_EVCNT_INCR(fdiv); @@ -725,6 +727,13 @@ fpu_execute(struct trapframe *tf, struct fpemu *fe, union instr *insn) return (NOTFPU); break; } + + /* If the instruction was single precision, round */ + if (!(instr.i_any.i_opcd & 0x4)) { + fpu_implode(fe, fp, FTYPE_SNG, + (u_int *)&fs->fpreg[rt]); + fpu_explode(fe, fp = &fe->fe_f1, FTYPE_SNG, rt); + } } } else { return (NOTFPU); |
