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| author | Taylor Simpson <tsimpson@quicinc.com> | 2021-04-08 20:07:46 -0500 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2021-05-01 08:31:43 -0700 |
| commit | dd8705bdf529d2c694ec3a4d4a2c18bb770d5c6c (patch) | |
| tree | b7b72776fe3a73f48a400961b2c5e802f961e51f /target/hexagon/op_helper.c | |
| parent | d934c16d8a1e0fb82fd4abfa54dcb5217430577c (diff) | |
| download | qemu-dd8705bdf529d2c694ec3a4d4a2c18bb770d5c6c.zip qemu-dd8705bdf529d2c694ec3a4d4a2c18bb770d5c6c.tar.gz qemu-dd8705bdf529d2c694ec3a4d4a2c18bb770d5c6c.tar.bz2 | |
Hexagon (target/hexagon) add F2_sfinvsqrta
Rd32,Pe4 = sfinvsqrta(Rs32)
Square root approx
The helper packs the 2 32-bit results into a 64-bit value,
and the fGEN_TCG override unpacks them into the proper results.
Test cases in tests/tcg/hexagon/multi_result.c
FP exception tests added to tests/tcg/hexagon/fpstuff.c
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <1617930474-31979-19-git-send-email-tsimpson@quicinc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'target/hexagon/op_helper.c')
| -rw-r--r-- | target/hexagon/op_helper.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/target/hexagon/op_helper.c b/target/hexagon/op_helper.c index 75861e2..a25fb98 100644 --- a/target/hexagon/op_helper.c +++ b/target/hexagon/op_helper.c @@ -326,6 +326,27 @@ uint64_t HELPER(sfrecipa)(CPUHexagonState *env, float32 RsV, float32 RtV) return ((uint64_t)RdV << 32) | PeV; } +uint64_t HELPER(sfinvsqrta)(CPUHexagonState *env, float32 RsV) +{ + int PeV = 0; + float32 RdV; + int idx; + int adjust; + int mant; + int exp; + + arch_fpop_start(env); + if (arch_sf_invsqrt_common(&RsV, &RdV, &adjust, &env->fp_status)) { + PeV = adjust; + idx = (RsV >> 17) & 0x7f; + mant = (invsqrt_lookup_table[idx] << 15); + exp = SF_BIAS - ((float32_getexp(RsV) - SF_BIAS) >> 1) - 1; + RdV = build_float32(extract32(RsV, 31, 1), exp, mant); + } + arch_fpop_end(env); + return ((uint64_t)RdV << 32) | PeV; +} + /* * mem_noshuf * Section 5.5 of the Hexagon V67 Programmer's Reference Manual |