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target/ppc: Replicate double->int32 result for some vector insns 

Power ISA v3.1 formalizes the previously undefined result in
words 1 and 3 to be a copy of the result in words 0 and 2.

This affects: xscvdpsxws, xscvdpuxws, xvcvdpsxws, xvcvdpuxws.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/852
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
[ clg: checkpatch fixes ]
Message-Id: <20220315053934.377519-1-richard.henderson@linaro.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Richard Henderson 2022-03-20 23:35:27 +01:00 committed by Cédric Le Goater
parent 9d1401b794
commit 217979d33e
1 changed files with 39 additions and 6 deletions
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45
target/ppc/fpu_helper.c
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@ -2891,22 +2891,55 @@ void helper_##op(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb) \
VSX_CVT_FP_TO_INT(xscvdpsxds, 1, float64, int64, VsrD(0), VsrD(0), \
0x8000000000000000ULL)
VSX_CVT_FP_TO_INT(xscvdpsxws, 1, float64, int32, VsrD(0), VsrW(1), \
0x80000000U)
VSX_CVT_FP_TO_INT(xscvdpuxds, 1, float64, uint64, VsrD(0), VsrD(0), 0ULL)
VSX_CVT_FP_TO_INT(xscvdpuxws, 1, float64, uint32, VsrD(0), VsrW(1), 0U)
VSX_CVT_FP_TO_INT(xvcvdpsxds, 2, float64, int64, VsrD(i), VsrD(i), \
0x8000000000000000ULL)
VSX_CVT_FP_TO_INT(xvcvdpsxws, 2, float64, int32, VsrD(i), VsrW(2 * i), \
0x80000000U)
VSX_CVT_FP_TO_INT(xvcvdpuxds, 2, float64, uint64, VsrD(i), VsrD(i), 0ULL)
VSX_CVT_FP_TO_INT(xvcvdpuxws, 2, float64, uint32, VsrD(i), VsrW(2 * i), 0U)
VSX_CVT_FP_TO_INT(xvcvspsxds, 2, float32, int64, VsrW(2 * i), VsrD(i), \
0x8000000000000000ULL)
VSX_CVT_FP_TO_INT(xvcvspsxws, 4, float32, int32, VsrW(i), VsrW(i), 0x80000000U)
VSX_CVT_FP_TO_INT(xvcvspuxds, 2, float32, uint64, VsrW(2 * i), VsrD(i), 0ULL)
VSX_CVT_FP_TO_INT(xvcvspuxws, 4, float32, uint32, VsrW(i), VsrW(i), 0U)
/*
* Likewise, except that the result is duplicated into both subwords.
* Power ISA v3.1 has Programming Notes for these insns:
* Previous versions of the architecture allowed the contents of
* word 0 of the result register to be undefined. However, all
* processors that support this instruction write the result into
* words 0 and 1 (and words 2 and 3) of the result register, as
* is required by this version of the architecture.
*/
#define VSX_CVT_FP_TO_INT2(op, nels, stp, ttp, rnan) \
void helper_##op(CPUPPCState *env, ppc_vsr_t *xt, ppc_vsr_t *xb) \
{ \
int all_flags = env->fp_status.float_exception_flags, flags; \
ppc_vsr_t t = { }; \
int i; \
\
for (i = 0; i < nels; i++) { \
env->fp_status.float_exception_flags = 0; \
t.VsrW(2 * i) = stp##_to_##ttp##_round_to_zero(xb->VsrD(i), \
&env->fp_status); \
flags = env->fp_status.float_exception_flags; \
if (unlikely(flags & float_flag_invalid)) { \
t.VsrW(2 * i) = float_invalid_cvt(env, flags, t.VsrW(2 * i), \
rnan, 0, GETPC()); \
} \
t.VsrW(2 * i + 1) = t.VsrW(2 * i); \
all_flags |= flags; \
} \
\
*xt = t; \
env->fp_status.float_exception_flags = all_flags; \
do_float_check_status(env, GETPC()); \
}
VSX_CVT_FP_TO_INT2(xscvdpsxws, 1, float64, int32, 0x80000000U)
VSX_CVT_FP_TO_INT2(xscvdpuxws, 1, float64, uint32, 0U)
VSX_CVT_FP_TO_INT2(xvcvdpsxws, 2, float64, int32, 0x80000000U)
VSX_CVT_FP_TO_INT2(xvcvdpuxws, 2, float64, uint32, 0U)
/*
* VSX_CVT_FP_TO_INT_VECTOR - VSX floating point to integer conversion
* op - instruction mnemonic