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Improve Math#sign (#72)

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This commit is contained in:
Max Graey 2018-04-12 20:26:50 +03:00 committed by Daniel Wirtz
parent 2002e32c9c
commit 1cea3c6f08
5 changed files with 40 additions and 50 deletions
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6
std/assembly/math.ts
View File

@ -1042,7 +1042,8 @@ export namespace NativeMath {
@inline
export function sign(x: f64): f64 {
return x > 0 ? 1 : x < 0 ? -1 : x;
// return x > 0 ? 1 : x < 0 ? -1 : x;
return builtin_abs<f64>(x) > 0 ? builtin_copysign<f64>(1, x) : x;
}
export function sin(x: f64): f64 { // TODO
@ -2096,7 +2097,8 @@ export namespace NativeMathf {
@inline
export function sign(x: f32): f32 {
return x > 0 ? 1 : x < 0 ? -1 : x;
// return x > 0 ? 1 : x < 0 ? -1 : x;
return builtin_abs<f32>(x) > 0 ? builtin_copysign<f32>(1, x) : x;
}
export function sin(x: f32): f32 { // TODO

14
tests/compiler/std/libm.optimized.wat
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@ -5719,19 +5719,17 @@
(func $std/libm/sign (; 50 ;) (type $FF) (param $0 f64) (result f64)
(local $1 f64)
(select
(f64.const 1)
(select
(f64.const -1)
(f64.copysign
(f64.const 1)
(tee_local $1
(get_local $0)
)
(f64.lt
(get_local $1)
(f64.const 0)
)
)
(get_local $1)
(f64.gt
(get_local $1)
(f64.abs
(get_local $1)
)
(f64.const 0)
)
)

14
tests/compiler/std/libm.untouched.wat
View File

@ -6839,18 +6839,16 @@
(br $~lib/math/NativeMath.sign|inlined.0
(if (result f64)
(f64.gt
(get_local $1)
(f64.abs
(get_local $1)
)
(f64.const 0)
)
(f64.const 1)
(if (result f64)
(f64.lt
(get_local $1)
(f64.const 0)
)
(f64.const -1)
(f64.copysign
(f64.const 1)
(get_local $1)
)
(get_local $1)
)
)
)

28
tests/compiler/std/math.optimized.wat
View File

@ -12474,19 +12474,17 @@
(tee_local $4
(call $std/math/check<f64>
(select
(f64.const 1)
(select
(f64.const -1)
(f64.copysign
(f64.const 1)
(tee_local $5
(get_local $0)
)
(f64.lt
(get_local $5)
(f64.const 0)
)
)
(get_local $5)
(f64.gt
(get_local $5)
(f64.abs
(get_local $5)
)
(f64.const 0)
)
)
@ -12518,19 +12516,17 @@
(local $4 f32)
(call $std/math/check<f32>
(select
(f32.const 1)
(select
(f32.const -1)
(f32.copysign
(f32.const 1)
(tee_local $4
(get_local $0)
)
(f32.lt
(get_local $4)
(f32.const 0)
)
)
(get_local $4)
(f32.gt
(get_local $4)
(f32.abs
(get_local $4)
)
(f32.const 0)
)
)

28
tests/compiler/std/math.untouched.wat
View File

@ -14859,18 +14859,16 @@
(br $~lib/math/NativeMath.sign|inlined.0
(if (result f64)
(f64.gt
(get_local $4)
(f64.abs
(get_local $4)
)
(f64.const 0)
)
(f64.const 1)
(if (result f64)
(f64.lt
(get_local $4)
(f64.const 0)
)
(f64.const -1)
(f64.copysign
(f64.const 1)
(get_local $4)
)
(get_local $4)
)
)
)
@ -14912,18 +14910,16 @@
(br $~lib/math/NativeMathf.sign|inlined.0
(if (result f32)
(f32.gt
(get_local $4)
(f32.abs
(get_local $4)
)
(f32.const 0)
)
(f32.const 1)
(if (result f32)
(f32.lt
(get_local $4)
(f32.const 0)
)
(f32.const -1)
(f32.copysign
(f32.const 1)
(get_local $4)
)
(get_local $4)
)
)
)