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| author | Andrea Orru <andrea@orru.io> | 2018-08-06 01:43:19 -0400 |
|---|---|---|
| committer | Andrea Orru <andrea@orru.io> | 2018-08-06 01:43:19 -0400 |
| commit | d2f5e57b68da0b16e5789ca19045ccbcb4ecfa8d (patch) | |
| tree | e9fa3caec533a0d1e2b434868b2fde1f9240e5c8 /std/math/log10.zig | |
| parent | 06614b3fa09954464c2e2f32756cacedc178a282 (diff) | |
| parent | 63a23e848a62d5f167f8d5478de9766cb24aa6eb (diff) | |
| download | zig-d2f5e57b68da0b16e5789ca19045ccbcb4ecfa8d.tar.gz zig-d2f5e57b68da0b16e5789ca19045ccbcb4ecfa8d.zip | |
Merge branch 'master' into zen_stdlib
Diffstat (limited to 'std/math/log10.zig')
| -rw-r--r-- | std/math/log10.zig | 36 |
1 files changed, 17 insertions, 19 deletions
diff --git a/std/math/log10.zig b/std/math/log10.zig index aa74caa901..a93ce48fb7 100644 --- a/std/math/log10.zig +++ b/std/math/log10.zig @@ -14,7 +14,7 @@ const TypeId = builtin.TypeId; pub fn log10(x: var) @typeOf(x) { const T = @typeOf(x); switch (@typeId(T)) { - TypeId.FloatLiteral => { + TypeId.ComptimeFloat => { return @typeOf(1.0)(log10_64(x)); }, TypeId.Float => { @@ -24,21 +24,21 @@ pub fn log10(x: var) @typeOf(x) { else => @compileError("log10 not implemented for " ++ @typeName(T)), }; }, - TypeId.IntLiteral => { + TypeId.ComptimeInt => { return @typeOf(1)(math.floor(log10_64(f64(x)))); }, TypeId.Int => { - return T(math.floor(log10_64(f64(x)))); + return @floatToInt(T, math.floor(log10_64(@intToFloat(f64, x)))); }, else => @compileError("log10 not implemented for " ++ @typeName(T)), } } pub fn log10_32(x_: f32) f32 { - const ivln10hi: f32 = 4.3432617188e-01; - const ivln10lo: f32 = -3.1689971365e-05; - const log10_2hi: f32 = 3.0102920532e-01; - const log10_2lo: f32 = 7.9034151668e-07; + const ivln10hi: f32 = 4.3432617188e-01; + const ivln10lo: f32 = -3.1689971365e-05; + const log10_2hi: f32 = 3.0102920532e-01; + const log10_2lo: f32 = 7.9034151668e-07; const Lg1: f32 = 0xaaaaaa.0p-24; const Lg2: f32 = 0xccce13.0p-25; const Lg3: f32 = 0x91e9ee.0p-25; @@ -71,7 +71,7 @@ pub fn log10_32(x_: f32) f32 { // x into [sqrt(2) / 2, sqrt(2)] ix += 0x3F800000 - 0x3F3504F3; - k += i32(ix >> 23) - 0x7F; + k += @intCast(i32, ix >> 23) - 0x7F; ix = (ix & 0x007FFFFF) + 0x3F3504F3; x = @bitCast(f32, ix); @@ -89,14 +89,14 @@ pub fn log10_32(x_: f32) f32 { u &= 0xFFFFF000; hi = @bitCast(f32, u); const lo = f - hi - hfsq + s * (hfsq + R); - const dk = f32(k); + const dk = @intToFloat(f32, k); return dk * log10_2lo + (lo + hi) * ivln10lo + lo * ivln10hi + hi * ivln10hi + dk * log10_2hi; } pub fn log10_64(x_: f64) f64 { - const ivln10hi: f64 = 4.34294481878168880939e-01; - const ivln10lo: f64 = 2.50829467116452752298e-11; + const ivln10hi: f64 = 4.34294481878168880939e-01; + const ivln10lo: f64 = 2.50829467116452752298e-11; const log10_2hi: f64 = 3.01029995663611771306e-01; const log10_2lo: f64 = 3.69423907715893078616e-13; const Lg1: f64 = 6.666666666666735130e-01; @@ -109,7 +109,7 @@ pub fn log10_64(x_: f64) f64 { var x = x_; var ix = @bitCast(u64, x); - var hx = u32(ix >> 32); + var hx = @intCast(u32, ix >> 32); var k: i32 = 0; if (hx < 0x00100000 or hx >> 31 != 0) { @@ -125,18 +125,16 @@ pub fn log10_64(x_: f64) f64 { // subnormal, scale x k -= 54; x *= 0x1.0p54; - hx = u32(@bitCast(u64, x) >> 32); - } - else if (hx >= 0x7FF00000) { + hx = @intCast(u32, @bitCast(u64, x) >> 32); + } else if (hx >= 0x7FF00000) { return x; - } - else if (hx == 0x3FF00000 and ix << 32 == 0) { + } else if (hx == 0x3FF00000 and ix << 32 == 0) { return 0; } // x into [sqrt(2) / 2, sqrt(2)] hx += 0x3FF00000 - 0x3FE6A09E; - k += i32(hx >> 20) - 0x3FF; + k += @intCast(i32, hx >> 20) - 0x3FF; hx = (hx & 0x000FFFFF) + 0x3FE6A09E; ix = (u64(hx) << 32) | (ix & 0xFFFFFFFF); x = @bitCast(f64, ix); @@ -159,7 +157,7 @@ pub fn log10_64(x_: f64) f64 { // val_hi + val_lo ~ log10(1 + f) + k * log10(2) var val_hi = hi * ivln10hi; - const dk = f64(k); + const dk = @intToFloat(f64, k); const y = dk * log10_2hi; var val_lo = dk * log10_2lo + (lo + hi) * ivln10lo + lo * ivln10hi; |
