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| author | Taylor Simpson <tsimpson@quicinc.com> | 2021-04-08 20:07:45 -0500 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2021-05-01 08:31:43 -0700 |
| commit | d934c16d8a1e0fb82fd4abfa54dcb5217430577c (patch) | |
| tree | 4f98424f1036f09e712d80be7ba95faf130c17ab /target/hexagon/op_helper.c | |
| parent | 85580a65577898288a29d849160601895979c661 (diff) | |
| download | qemu-d934c16d8a1e0fb82fd4abfa54dcb5217430577c.zip qemu-d934c16d8a1e0fb82fd4abfa54dcb5217430577c.tar.gz qemu-d934c16d8a1e0fb82fd4abfa54dcb5217430577c.tar.bz2 | |
Hexagon (target/hexagon) add F2_sfrecipa instruction
Rd32,Pe4 = sfrecipa(Rs32, Rt32)
Recripocal approx
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: <1617930474-31979-18-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 | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/target/hexagon/op_helper.c b/target/hexagon/op_helper.c index 33b6713..75861e2 100644 --- a/target/hexagon/op_helper.c +++ b/target/hexagon/op_helper.c @@ -289,6 +289,43 @@ int32_t HELPER(fcircadd)(int32_t RxV, int32_t offset, int32_t M, int32_t CS) return new_ptr; } +static float32 build_float32(uint8_t sign, uint32_t exp, uint32_t mant) +{ + return make_float32( + ((sign & 1) << 31) | + ((exp & 0xff) << SF_MANTBITS) | + (mant & ((1 << SF_MANTBITS) - 1))); +} + +/* + * sfrecipa, sfinvsqrta have two 32-bit results + * r0,p0=sfrecipa(r1,r2) + * r0,p0=sfinvsqrta(r1) + * + * Since helpers can only return a single value, we pack the two results + * into a 64-bit value. + */ +uint64_t HELPER(sfrecipa)(CPUHexagonState *env, float32 RsV, float32 RtV) +{ + int32_t PeV = 0; + float32 RdV; + int idx; + int adjust; + int mant; + int exp; + + arch_fpop_start(env); + if (arch_sf_recip_common(&RsV, &RtV, &RdV, &adjust, &env->fp_status)) { + PeV = adjust; + idx = (RtV >> 16) & 0x7f; + mant = (recip_lookup_table[idx] << 15) | 1; + exp = SF_BIAS - (float32_getexp(RtV) - SF_BIAS) - 1; + RdV = build_float32(extract32(RtV, 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 |