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Simplify some powers; nits.

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LDj3SNuD 2018-12-19 00:02:07 +01:00 • committed by GitHub
parent a4614d6d6c
commit a4446471e3
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 17 additions and 17 deletions
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34
ChocolArm64/Instructions/SoftFloat.cs
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@ -9,12 +9,12 @@ namespace ChocolArm64.Instructions
{
static SoftFloat()
{
RecipEstimateTable = BuildRecipEstimateTable();
InvSqrtEstimateTable = BuildInvSqrtEstimateTable();
RecipEstimateTable = BuildRecipEstimateTable();
RecipSqrtEstimateTable = BuildRecipSqrtEstimateTable();
}
internal static readonly byte[] RecipEstimateTable;
internal static readonly byte[] InvSqrtEstimateTable;
internal static readonly byte[] RecipSqrtEstimateTable;
private static byte[] BuildRecipEstimateTable()
{
@ -28,7 +28,7 @@ namespace ChocolArm64.Instructions
src = (src << 1) + 1u;
uint aux = 0x00080000u / src;
uint aux = (1u << 19) / src;
uint dst = (aux + 1u) >> 1;
@ -40,7 +40,7 @@ namespace ChocolArm64.Instructions
return tbl;
}
private static byte[] BuildInvSqrtEstimateTable()
private static byte[] BuildRecipSqrtEstimateTable()
{
byte[] tbl = new byte[384];
@ -62,7 +62,7 @@ namespace ChocolArm64.Instructions
uint aux = 512u;
while (src * (aux + 1u) * (aux + 1u) < 0x10000000u)
while (src * (aux + 1u) * (aux + 1u) < (1u << 28))
{
aux = aux + 1u;
}
@ -276,12 +276,12 @@ namespace ChocolArm64.Instructions
{
intMant++;
if (intMant == (uint)Math.Pow(2d, f))
if (intMant == 1u << f)
{
biasedExp = 1u;
}
if (intMant == (uint)Math.Pow(2d, f + 1))
if (intMant == 1u << (f + 1))
{
biasedExp++;
intMant >>= 1;
@ -290,7 +290,7 @@ namespace ChocolArm64.Instructions
float result;
if (biasedExp >= (uint)Math.Pow(2d, e) - 1u)
if (biasedExp >= (1u << e) - 1u)
{
result = overflowToInf ? FPInfinity(sign) : FPMaxNormal(sign);
@ -547,12 +547,12 @@ namespace ChocolArm64.Instructions
{
intMant++;
if (intMant == (uint)Math.Pow(2d, f))
if (intMant == 1u << f)
{
biasedExp = 1u;
}
if (intMant == (uint)Math.Pow(2d, f + 1))
if (intMant == 1u << (f + 1))
{
biasedExp++;
intMant >>= 1;
@ -563,7 +563,7 @@ namespace ChocolArm64.Instructions
if (!state.GetFpcrFlag(Fpcr.Ahp))
{
if (biasedExp >= (uint)Math.Pow(2d, e) - 1u)
if (biasedExp >= (1u << e) - 1u)
{
resultBits = overflowToInf ? FPInfinity(sign) : FPMaxNormal(sign);
@ -578,7 +578,7 @@ namespace ChocolArm64.Instructions
}
else
{
if (biasedExp >= (uint)Math.Pow(2d, e))
if (biasedExp >= 1u << e)
{
resultBits = (ushort)((sign ? 1u : 0u) << 15 | 0x7FFFu);
@ -1225,7 +1225,7 @@ namespace ChocolArm64.Instructions
uint resultExp = 253u - exp;
uint estimate = (uint)SoftFloat.RecipEstimateTable[(int)(scaled - 256u)] + 256u;
uint estimate = (uint)SoftFloat.RecipEstimateTable[scaled - 256u] + 256u;
fraction = (ulong)(estimate & 0xFFu) << 44;
@ -1370,7 +1370,7 @@ namespace ChocolArm64.Instructions
uint resultExp = (380u - exp) >> 1;
uint estimate = (uint)SoftFloat.InvSqrtEstimateTable[(int)(scaled - 128u)] + 256u;
uint estimate = (uint)SoftFloat.RecipSqrtEstimateTable[scaled - 128u] + 256u;
result = BitConverter.Int32BitsToSingle((int)((resultExp & 0xFFu) << 23 | (estimate & 0xFFu) << 15));
}
@ -2309,7 +2309,7 @@ namespace ChocolArm64.Instructions
uint resultExp = 2045u - exp;
uint estimate = (uint)SoftFloat.RecipEstimateTable[(int)(scaled - 256u)] + 256u;
uint estimate = (uint)SoftFloat.RecipEstimateTable[scaled - 256u] + 256u;
fraction = (ulong)(estimate & 0xFFu) << 44;
@ -2454,7 +2454,7 @@ namespace ChocolArm64.Instructions
uint resultExp = (3068u - exp) >> 1;
uint estimate = (uint)SoftFloat.InvSqrtEstimateTable[(int)(scaled - 128u)] + 256u;
uint estimate = (uint)SoftFloat.RecipSqrtEstimateTable[scaled - 128u] + 256u;
result = BitConverter.Int64BitsToDouble((long)((resultExp & 0x7FFul) << 52 | (estimate & 0xFFul) << 44));
}