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target-ppc: Add VSX xmax/xmin Instructions

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This patch adds the VSX floating point maximum and minimum
instructions:

  - xsmaxdp, xvmaxdp, xvmaxsp
  - xsmindp, xvmindp, xvminsp

Because of the Power ISA definitions of maximum and minimum
on various boundary cases, the standard softfloat comparison
routines (e.g. float64_lt) do not work as well as one might
think.  Therefore specific routines for comparing 64 and 32
bit floating point numbers are implemented in the PowerPC
helper code.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Tom Musta 2014-01-02 16:21:31 -06:00 • committed by Alexander Graf
parent 4f17e9c738
commit 959e9c9d1e
3 changed files with 57 additions and 0 deletions
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39
target-ppc/fpu_helper.c
View file

@ -2288,3 +2288,42 @@ void helper_##op(CPUPPCState *env, uint32_t opcode) \
VSX_SCALAR_CMP(xscmpodp, 1)
VSX_SCALAR_CMP(xscmpudp, 0)
#define float64_snan_to_qnan(x) ((x) | 0x0008000000000000ul)
#define float32_snan_to_qnan(x) ((x) | 0x00400000)
/* VSX_MAX_MIN - VSX floating point maximum/minimum
* name - instruction mnemonic
* op - operation (max or min)
* nels - number of elements (1, 2 or 4)
* tp - type (float32 or float64)
* fld - vsr_t field (f32 or f64)
*/
#define VSX_MAX_MIN(name, op, nels, tp, fld) \
void helper_##name(CPUPPCState *env, uint32_t opcode) \
{ \
ppc_vsr_t xt, xa, xb; \
int i; \
\
getVSR(xA(opcode), &xa, env); \
getVSR(xB(opcode), &xb, env); \
getVSR(xT(opcode), &xt, env); \
\
for (i = 0; i < nels; i++) { \
xt.fld[i] = tp##_##op(xa.fld[i], xb.fld[i], &env->fp_status); \
if (unlikely(tp##_is_signaling_nan(xa.fld[i]) || \
tp##_is_signaling_nan(xb.fld[i]))) { \
fload_invalid_op_excp(env, POWERPC_EXCP_FP_VXSNAN, 0); \
} \
} \
\
putVSR(xT(opcode), &xt, env); \
helper_float_check_status(env); \
}
VSX_MAX_MIN(xsmaxdp, maxnum, 1, float64, f64)
VSX_MAX_MIN(xvmaxdp, maxnum, 2, float64, f64)
VSX_MAX_MIN(xvmaxsp, maxnum, 4, float32, f32)
VSX_MAX_MIN(xsmindp, minnum, 1, float64, f64)
VSX_MAX_MIN(xvmindp, minnum, 2, float64, f64)
VSX_MAX_MIN(xvminsp, minnum, 4, float32, f32)