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Fix minus accuracy difference in spu_re_acc

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RipleyTom 2024-02-14 18:41:58 +01:00
parent 7abc5f3ead
commit 2c243895c8
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1 changed files with 4 additions and 2 deletions
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6
rpcs3/Emu/Cell/SPULLVMRecompiler.cpp
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@ -6016,15 +6016,17 @@ public:
const auto div_result = the_one / div;
// from ps3 hardware testing: Inf => NaN and NaN => Zero
// From ps3 hardware testing: Inf => NaN and NaN => Zero, Signed Zero => Zero
// This results in full accuracy within 1ulp(Currently x86 seems to be rounding up?)
const auto result_and = bitcast<u32[4]>(div_result) & 0x7fffffffu;
const auto result_cmp_inf = sext<s32[4]>(result_and == splat<u32[4]>(0x7F800000u));
const auto result_cmp_nan = sext<s32[4]>(result_and <= splat<u32[4]>(0x7F800000u));
const auto and_mask_zero = bitcast<u32[4]>(sext<s32[4]>(result_and != splat<u32[4]>(0u)));
const auto and_mask = bitcast<u32[4]>(result_cmp_nan) & splat<u32[4]>(0xFFFFFFFFu);
const auto or_mask = bitcast<u32[4]>(result_cmp_inf) & splat<u32[4]>(0xFFFFFFFu);
return bitcast<f32[4]>((bitcast<u32[4]>(div_result) & and_mask) | or_mask);
return bitcast<f32[4]>(((bitcast<u32[4]>(div_result) & and_mask) & and_mask_zero) | or_mask);
});
const auto [a, b, c] = get_vrs<f32[4]>(op.ra, op.rb, op.rc);