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stdlib: use fixed-width Builtin.IntXX types for Swift.Int and UInt

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Using the unknown-sized Builtin.Word types complicates producing
compile-time overflow diagnostics.  If we don't know the target Word
size, we don't know if there is an overflow.  But SIL optimizer does not
know the size of Word, this is the point of having the Word type in the
first place.

Also, this opens up more possibilities for optimizations.

rdar://17604532

Swift SVN r24788
This commit is contained in:
Dmitri Hrybenko
2015-01-28 05:22:42 +00:00
parent b15c0bd01c
commit ff771d0984
8 changed files with 578 additions and 47 deletions
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4
stdlib/core/StringUTF8.swift
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@@ -128,9 +128,9 @@ extension String {
// Map the high nibble of the current code unit into the
// amount by which to increment the utf16 index. Only when
// the high nibble is 1111 do we have a surrogate pair.
let u16Increments =
let u16Increments = Int(bitPattern:
// 1111 1110 1101 1100 1011 1010 1001 1000 0111 0110 0101 0100 0011 0010 0001 0000
0b10___01___01___01___00___00___00___00___01___01___01___01___01___01___01___01
0b10___01___01___01___00___00___00___00___01___01___01___01___01___01___01___01)
let increment = (u16Increments >> numericCast(hiNibble << 1)) & 0x3
let nextCoreIndex = _coreIndex &+ increment
let nextBuffer = Index._nextBuffer(_buffer)