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better documentation for the new shr

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This commit is contained in:
narimiran 2019-06-04 12:29:52 +02:00
commit 1f883f6d78
2 changed files with 9 additions and 5 deletions
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lib/system.nim
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@ -1291,8 +1291,12 @@ when defined(nimNewShiftOps):
##
## .. code-block:: Nim
## 0b0001_0000'i8 shr 2 == 0b0000_0100'i8
## 0b1000_0000'i8 shr 8 == 0b0000_0000'i8
## 0b0000_0001'i8 shr 1 == 0b0000_0000'i8
## 0b1000_0000'i8 shr 4 == 0b1111_1000'i8
## -1 shr 5 == -1
## 1 shr 5 == 0
## 16 shr 2 == 4
## -16 shr 2 == -4
proc `shr`*(x: int8, y: SomeInteger): int8 {.magic: "AshrI", noSideEffect.}
proc `shr`*(x: int16, y: SomeInteger): int16 {.magic: "AshrI", noSideEffect.}
proc `shr`*(x: int32, y: SomeInteger): int32 {.magic: "AshrI", noSideEffect.}
@ -3387,8 +3391,8 @@ else:
when not defined(JS):
proc likelyProc(val: bool): bool {.importc: "NIM_LIKELY", nodecl, nosideeffect.}
proc unlikelyProc(val: bool): bool {.importc: "NIM_UNLIKELY", nodecl, nosideeffect.}
proc likelyProc(val: bool): bool {.importc: "likely", nodecl, nosideeffect.}
proc unlikelyProc(val: bool): bool {.importc: "unlikely", nodecl, nosideeffect.}
template likely*(val: bool): bool =
## Hints the optimizer that `val` is likely going to be true.