diff options
| author | Daniel Jacobowitz <drow@false.org> | 2006-08-27 12:42:10 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-08-27 12:42:10 +0100 |
| commit | c29ecac18cb740ae845db14963ac586c53962453 (patch) | |
| tree | c9de25e8cd7ee3729a613b0176b448fd86a62d94 /arch/arm/vfp/vfpdouble.c | |
| parent | 7c6f25141b88b5e926f9d43932ce668602d611ae (diff) | |
[ARM] 3749/3: Correct VFP single/double conversion emulation
Patch from Daniel Jacobowitz
The fcvtsd/fcvtds emulation was left behind when the numbering of double
precision registers was changed from 0-30 to 0-15. Both conversion
instructions were writing their results to the wrong register. Also,
the conversion instructions should stop after the first element even
if a vector length is specified.
Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/vfp/vfpdouble.c')
| -rw-r--r-- | arch/arm/vfp/vfpdouble.c | 28 |
1 files changed, 21 insertions, 7 deletions
diff --git a/arch/arm/vfp/vfpdouble.c b/arch/arm/vfp/vfpdouble.c index 009038c8113..021581680e9 100644 --- a/arch/arm/vfp/vfpdouble.c +++ b/arch/arm/vfp/vfpdouble.c @@ -1127,7 +1127,7 @@ u32 vfp_double_cpdo(u32 inst, u32 fpscr) { u32 op = inst & FOP_MASK; u32 exceptions = 0; - unsigned int dd = vfp_get_dd(inst); + unsigned int dest; unsigned int dn = vfp_get_dn(inst); unsigned int dm = vfp_get_dm(inst); unsigned int vecitr, veclen, vecstride; @@ -1137,10 +1137,20 @@ u32 vfp_double_cpdo(u32 inst, u32 fpscr) vecstride = (1 + ((fpscr & FPSCR_STRIDE_MASK) == FPSCR_STRIDE_MASK)) * 2; /* + * fcvtds takes an sN register number as destination, not dN. + * It also always operates on scalars. + */ + if ((inst & FEXT_MASK) == FEXT_FCVT) { + veclen = 0; + dest = vfp_get_sd(inst); + } else + dest = vfp_get_dd(inst); + + /* * If destination bank is zero, vector length is always '1'. * ARM DDI0100F C5.1.3, C5.3.2. */ - if (FREG_BANK(dd) == 0) + if (FREG_BANK(dest) == 0) veclen = 0; pr_debug("VFP: vecstride=%u veclen=%u\n", vecstride, @@ -1153,16 +1163,20 @@ u32 vfp_double_cpdo(u32 inst, u32 fpscr) for (vecitr = 0; vecitr <= veclen; vecitr += 1 << FPSCR_LENGTH_BIT) { u32 except; - if (op == FOP_EXT) + if (op == FOP_EXT && (inst & FEXT_MASK) == FEXT_FCVT) + pr_debug("VFP: itr%d (s%u) = op[%u] (d%u)\n", + vecitr >> FPSCR_LENGTH_BIT, + dest, dn, dm); + else if (op == FOP_EXT) pr_debug("VFP: itr%d (d%u) = op[%u] (d%u)\n", vecitr >> FPSCR_LENGTH_BIT, - dd, dn, dm); + dest, dn, dm); else pr_debug("VFP: itr%d (d%u) = (d%u) op[%u] (d%u)\n", vecitr >> FPSCR_LENGTH_BIT, - dd, dn, FOP_TO_IDX(op), dm); + dest, dn, FOP_TO_IDX(op), dm); - except = fop(dd, dn, dm, fpscr); + except = fop(dest, dn, dm, fpscr); pr_debug("VFP: itr%d: exceptions=%08x\n", vecitr >> FPSCR_LENGTH_BIT, except); @@ -1180,7 +1194,7 @@ u32 vfp_double_cpdo(u32 inst, u32 fpscr) * we encounter an exception. We continue. */ - dd = FREG_BANK(dd) + ((FREG_IDX(dd) + vecstride) & 6); + dest = FREG_BANK(dest) + ((FREG_IDX(dest) + vecstride) & 6); dn = FREG_BANK(dn) + ((FREG_IDX(dn) + vecstride) & 6); if (FREG_BANK(dm) != 0) dm = FREG_BANK(dm) + ((FREG_IDX(dm) + vecstride) & 6); |