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AK: Reorder AK/Math after the removal of i686
Without i686 we can remove some implementations for sqrt and round_to.
This commit is contained in:
Hendiadyoin1
Jelle Raaijmakers
parent
ce0f41b9fb
commit
1bdc4e6b29
Notes:
sideshowbarker
2024-07-17 09:56:35 +09:00
Author: https://github.com/Hendiadyoin1 Commit: https://github.com/SerenityOS/serenity/commit/1bdc4e6b29 Pull-request: https://github.com/SerenityOS/serenity/pull/16705 Reviewed-by: https://github.com/gmta ✅
1 changed files with 119 additions and 123 deletions
242
AK/Math.h
242
AK/Math.h
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@ -123,6 +123,20 @@ constexpr T sqrt(T x)
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CONSTEXPR_STATE(sqrt, x);
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#if ARCH(X86_64)
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if constexpr (IsSame<T, float>) {
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float res;
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asm("sqrtss %1, %0"
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: "=x"(res)
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: "x"(x));
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return res;
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}
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if constexpr (IsSame<T, double>) {
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double res;
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asm("sqrtsd %1, %0"
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: "=x"(res)
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: "x"(x));
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return res;
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}
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T res;
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asm("fsqrt"
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: "=t"(res)
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@ -140,53 +154,18 @@ constexpr T rsqrt(T x)
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{
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#if ARCH(AARCH64)
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AARCH64_INSTRUCTION(frsqrte, x);
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#elif ARCH(X86_64)
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if constexpr (IsSame<T, float>) {
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float res;
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asm("rsqrtss %1, %0"
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: "=x"(res)
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: "x"(x));
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return res;
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}
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#endif
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return (T)1. / sqrt(x);
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}
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#if ARCH(x86_64)
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template<>
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constexpr float sqrt(float x)
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{
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if (is_constant_evaluated())
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return __builtin_sqrtf(x);
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float res;
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asm("sqrtss %1, %0"
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: "=x"(res)
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: "x"(x));
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return res;
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}
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# ifdef __SSE2__
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template<>
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constexpr double sqrt(double x)
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{
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if (is_constant_evaluated())
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return __builtin_sqrt(x);
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double res;
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asm("sqrtsd %1, %0"
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: "=x"(res)
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: "x"(x));
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return res;
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}
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# endif
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template<>
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constexpr float rsqrt(float x)
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{
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if (is_constant_evaluated())
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return 1.f / __builtin_sqrtf(x);
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float res;
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asm("rsqrtss %1, %0"
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: "=x"(res)
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: "x"(x));
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return res;
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}
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#endif
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template<FloatingPoint T>
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constexpr T cbrt(T x)
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{
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@ -583,9 +562,12 @@ using Hyperbolic::sinh;
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using Hyperbolic::tanh;
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template<Integral I, FloatingPoint P>
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ALWAYS_INLINE I round_to(P value)
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{
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ALWAYS_INLINE I round_to(P value);
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#if ARCH(X86_64)
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template<Integral I>
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ALWAYS_INLINE I round_to(long double value)
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{
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// Note: fistps outputs into a signed integer location (i16, i32, i64),
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// so lets be nice and tell the compiler that.
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Conditional<sizeof(I) >= sizeof(i16), MakeSigned<I>, i16> ret;
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@ -606,86 +588,16 @@ ALWAYS_INLINE I round_to(P value)
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: "st");
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}
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return static_cast<I>(ret);
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#elif ARCH(AARCH64)
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if constexpr (IsSigned<I>) {
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if constexpr (sizeof(I) <= sizeof(i32)) {
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i32 res;
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if constexpr (IsSame<P, float>) {
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asm("fcvtns %w0, %s1"
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: "=r"(res)
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: "w"(value));
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} else if constexpr (IsSame<P, double>) {
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asm("fcvtns %w0, %d1"
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: "=r"(res)
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: "w"(value));
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} else if constexpr (IsSame<P, long double>) {
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TODO();
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}
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return static_cast<I>(res);
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}
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// either long or long long aka i64
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i64 res;
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if constexpr (IsSame<P, float>) {
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asm("fcvtns %0, %s1"
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: "=r"(res)
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: "w"(value));
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} else if constexpr (IsSame<P, double>) {
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asm("fcvtns %0, %d1"
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: "=r"(res)
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: "w"(value));
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} else if constexpr (IsSame<P, long double>) {
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TODO();
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}
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return static_cast<I>(res);
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}
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if constexpr (sizeof(I) <= sizeof(u32)) {
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u32 res;
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if constexpr (IsSame<P, float>) {
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asm("fcvtnu %w0, %s1"
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: "=r"(res)
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: "w"(value));
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} else if constexpr (IsSame<P, double>) {
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asm("fcvtnu %w0, %d1"
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: "=r"(res)
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: "w"(value));
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} else if constexpr (IsSame<P, long double>) {
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TODO();
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}
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return static_cast<I>(res);
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}
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// either unsigned long or unsigned long long aka u64
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u64 res;
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if constexpr (IsSame<P, float>) {
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asm("fcvtnu %0, %s1"
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: "=r"(res)
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: "w"(value));
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} else if constexpr (IsSame<P, double>) {
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asm("fcvtnu %0, %d1"
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: "=r"(res)
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: "w"(value));
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} else if constexpr (IsSame<P, long double>) {
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TODO();
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}
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return static_cast<I>(res);
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#else
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if constexpr (IsSame<P, long double>)
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return static_cast<I>(__builtin_llrintl(value));
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if constexpr (IsSame<P, double>)
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return static_cast<I>(__builtin_llrint(value));
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if constexpr (IsSame<P, float>)
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return static_cast<I>(__builtin_llrintf(value));
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#endif
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}
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#if ARCH(x86_64)
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template<Integral I>
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ALWAYS_INLINE I round_to(float value)
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{
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if constexpr (sizeof(I) == sizeof(i64)) {
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// Note: Outputting into 64-bit registers or memory locations requires the
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// REX prefix, so we have to fall back to long doubles on platforms
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// FIXME: round_to<u64> might will cause issues, aka the indefinite value being set,
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// if the value surpasses the i64 limit, even if the result could fit into an u64
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// To solve this we would either need to detect that value or do a range check and
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// then do a more specialized conversion, which might include a division (which is expensive)
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if constexpr (sizeof(I) == sizeof(i64) || IsSame<I, u32>) {
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i64 ret;
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asm("cvtss2si %1, %0"
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: "=r"(ret)
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@ -698,12 +610,15 @@ ALWAYS_INLINE I round_to(float value)
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: "xm"(value));
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return static_cast<I>(ret);
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}
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#endif
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#ifdef __SSE2__
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template<Integral I>
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ALWAYS_INLINE I round_to(double value)
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{
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if constexpr (sizeof(I) == sizeof(i64)) {
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// FIXME: round_to<u64> might will cause issues, aka the indefinite value being set,
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// if the value surpasses the i64 limit, even if the result could fit into an u64
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// To solve this we would either need to detect that value or do a range check and
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// then do a more specialized conversion, which might include a division (which is expensive)
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if constexpr (sizeof(I) == sizeof(i64) || IsSame<I, u32>) {
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i64 ret;
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asm("cvtsd2si %1, %0"
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: "=r"(ret)
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@ -716,6 +631,87 @@ ALWAYS_INLINE I round_to(double value)
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: "xm"(value));
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return static_cast<I>(ret);
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}
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#elif ARCH(AARCH64)
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template<Signed I>
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ALWAYS_INLINE I round_to(float value)
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{
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if constexpr (sizeof(I) <= sizeof(u32)) {
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i32 res;
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asm("fcvtns %w0, %s1"
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: "=r"(res)
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: "w"(value));
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return static_cast<I>(res);
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}
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i64 res;
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asm("fcvtns %0, %s1"
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: "=r"(res)
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: "w"(value));
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return static_cast<I>(res);
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}
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template<Signed I>
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ALWAYS_INLINE I round_to(double value)
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{
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if constexpr (sizeof(I) <= sizeof(u32)) {
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i32 res;
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asm("fcvtns %w0, %d1"
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: "=r"(res)
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: "w"(value));
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return static_cast<I>(res);
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}
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i64 res;
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asm("fcvtns %0, %d1"
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: "=r"(res)
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: "w"(value));
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return static_cast<I>(res);
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}
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template<Unsigned U>
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ALWAYS_INLINE U round_to(float value)
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{
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if constexpr (sizeof(U) <= sizeof(u32)) {
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u32 res;
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asm("fcvtnu %w0, %s1"
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: "=r"(res)
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: "w"(value));
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return static_cast<U>(res);
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}
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i64 res;
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asm("fcvtnu %0, %s1"
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: "=r"(res)
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: "w"(value));
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return static_cast<U>(res);
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}
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template<Unsigned U>
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ALWAYS_INLINE U round_to(double value)
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{
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if constexpr (sizeof(U) <= sizeof(u32)) {
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u32 res;
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asm("fcvtns %w0, %d1"
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: "=r"(res)
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: "w"(value));
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return static_cast<U>(res);
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}
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i64 res;
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asm("fcvtns %0, %d1"
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: "=r"(res)
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: "w"(value));
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return static_cast<U>(res);
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}
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#else
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template<Integral I, FloatingPoint P>
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ALWAYS_INLINE I round_to(P value)
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{
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if constexpr (IsSame<P, long double>)
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return static_cast<I>(__builtin_llrintl(value));
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if constexpr (IsSame<P, double>)
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return static_cast<I>(__builtin_llrint(value));
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if constexpr (IsSame<P, float>)
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return static_cast<I>(__builtin_llrintf(value));
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}
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#endif
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template<FloatingPoint T>
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