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SPU LLVM: Optimize remaining rotate instructions which take a twos compliment value as input

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ROTQMBYBI looks for -7 for it's twos compliment construction
This commit is contained in:
Malcolm Jestadt 2023-09-16 18:59:39 -04:00 committed by Elad Ashkenazi
parent a70f278117
commit 05b6108c66
1 changed files with 27 additions and 6 deletions
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33
rpcs3/Emu/Cell/SPURecompiler.cpp
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@ -8095,19 +8095,33 @@ public:
void ROTQMBYBI(spu_opcode_t op) void ROTQMBYBI(spu_opcode_t op)
{ {
const auto a = get_vr<u8[16]>(op.ra); const auto a = get_vr<u8[16]>(op.ra);
const auto b = get_vr<u8[16]>(op.rb); const auto b = get_vr<s32[4]>(op.rb);
auto minusb = eval(-(b >> 3));
if (auto [ok, v0, v1] = match_expr(b, match<s32[4]>() - match<s32[4]>()); ok)
{
if (auto [ok1, data] = get_const_vector(v0.value, m_pos); ok1)
{
if (data == v128::from32p(7))
{
minusb = eval(v1 >> 3);
}
}
}
const auto minusbx = eval(bitcast<u8[16]>(minusb) & 0x1f);
// Data with swapped endian from a load instruction // Data with swapped endian from a load instruction
if (auto [ok, as] = match_expr(a, byteswap(match<u8[16]>())); ok) if (auto [ok, as] = match_expr(a, byteswap(match<u8[16]>())); ok)
{ {
const auto sc = build<u8[16]>(15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0); const auto sc = build<u8[16]>(15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
const auto sh = sc - (-(splat_scalar(b) >> 3) & 0x1f); const auto sh = sc - splat_scalar(minusbx);
set_vr(op.rt, pshufb(as, sh)); set_vr(op.rt, pshufb(as, sh));
return; return;
} }
const auto sc = build<u8[16]>(112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127); const auto sc = build<u8[16]>(112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127);
const auto sh = sc + (-(splat_scalar(b) >> 3) & 0x1f); const auto sh = sc + splat_scalar(minusbx);
set_vr(op.rt, pshufb(a, sh)); set_vr(op.rt, pshufb(a, sh));
} }
@ -8200,9 +8214,16 @@ public:
void ROTQMBI(spu_opcode_t op) void ROTQMBI(spu_opcode_t op)
{ {
const auto a = get_vr(op.ra); const auto [a, b] = get_vrs<u32[4]>(op.ra, op.rb);
const auto b = splat_scalar(-get_vr(op.rb) & 0x7);
set_vr(op.rt, fshr(zshuffle(a, 1, 2, 3, 4), a, b)); auto minusb = eval(-b);
if (auto [ok, x] = match_expr(b, -match<u32[4]>()); ok)
{
minusb = eval(x);
}
const auto bx = splat_scalar(minusb) & 0x7;
set_vr(op.rt, fshr(zshuffle(a, 1, 2, 3, 4), a, bx));
} }
void SHLQBI(spu_opcode_t op) void SHLQBI(spu_opcode_t op)