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emit_x64_floating_point: Correct error in s16 rounding in EmitFPToFixed

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This commit is contained in:
MerryMage 2020-06-22 22:54:38 +01:00
parent 3ea49fc6d6
commit 2008fda88b
2 changed files with 23 additions and 6 deletions
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9
src/backend/x64/emit_x64_floating_point.cpp
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@ -50,6 +50,7 @@ constexpr u64 f64_nan = 0x7ff8000000000000u;
constexpr u64 f64_non_sign_mask = 0x7fffffffffffffffu;
constexpr u64 f64_smallest_normal = 0x0010000000000000u;
constexpr u64 f64_min_s16 = 0xc0e0000000000000u; // -32768 as a double
constexpr u64 f64_max_s16 = 0x40dfffc000000000u; // 32767 as a double
constexpr u64 f64_min_u16 = 0x0000000000000000u; // 0 as a double
constexpr u64 f64_max_u16 = 0x40efffe000000000u; // 65535 as a double
@ -1275,12 +1276,8 @@ static void EmitFPToFixed(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
}
} else {
code.minsd(src, code.MConst(xword, unsigned_ ? f64_max_u16 : f64_max_s16));
if (unsigned_) {
code.maxsd(src, code.MConst(xword, f64_min_u16));
code.cvttsd2si(result, src); // 64 bit gpr
} else {
code.cvttsd2si(result.cvt32(), src);
}
code.maxsd(src, code.MConst(xword, unsigned_ ? f64_min_u16 : f64_min_s16));
code.cvttsd2si(result, src); // 64 bit gpr
}
ctx.reg_alloc.DefineValue(inst, result);