vasilito
ff4ff35918
Red Bear OS is a full fork. All sources must be available from git clone with zero network access. Removed gitignore rules that excluded fetched source trees under recipes/*/source/, local/recipes/kde/*/source/, local/recipes/qt/*/source/, and vendor source trees. Build artifacts (target/, build/, source.tar, *.o, *.so) remain excluded. 127291 files added — kernel, relibc, base, bootloader, pkgar, all KDE/Qt frameworks, mesa, wayland, DRM drivers, and every other recipe source.
38 lines
899 B
Plaintext
38 lines
899 B
Plaintext
All current (2001) S/390 and z/Architecture machines are single-issue,
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but some newer machines have a deep pipeline. Software-pipelining is
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therefore beneficial.
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* mpn_add_n, mpn_sub_n: Use code along the lines below. Two-way unrolling
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would be adequate.
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mp_limb_t
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mpn_add_n (mp_ptr rp, mp_srcptr up, mp_srcptr vp, mp_size_t n)
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{
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mp_limb_t a, b, r, cy;
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mp_size_t i;
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mp_limb_t mm = -1;
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cy = 0;
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up += n;
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vp += n;
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rp += n;
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i = -n;
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do
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{
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a = up[i];
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b = vp[i];
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r = a + b + cy;
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rp[i] = r;
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cy = (((a & b) | ((a | b) & (r ^ mm)))) >> 31;
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i++;
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}
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while (i < 0);
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return cy;
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}
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* mpn_lshift, mpn_rshift: Use SLDL/SRDL, and two-way unrolling.
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* mpn_mul_1, mpn_addmul_1, mpn_submul_1: For machines with just signed
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multiply (MR), use two loops, similar to the corresponding VAX or
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POWER functions. Handle carry like for mpn_add_n.
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