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[refactoring] remove zeroExtend and friends from the compiler builtins. (#11531)

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* remove zeroExtend and friends from the compiler builtins.
* fix jssys
This commit is contained in:
Arne Döring 2019-06-24 09:19:02 +02:00 • committed by Andreas Rumpf
commit e90d91f0e4
10 changed files with 76 additions and 116 deletions
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compiler/vm.nim
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@ -1905,16 +1905,6 @@ proc rawExecute(c: PCtx, start: int, tos: PStackFrame): TFullReg =
when not defined(nimNoNilSeqs):
if regs[ra].node.strVal.isNil: regs[ra].node.strVal = newStringOfCap(1000)
storeAny(regs[ra].node.strVal, typ, regs[rb].regToNode, c.config)
of opcToNarrowInt:
decodeBC(rkInt)
let mask = (1'i64 shl rc) - 1 # 0xFF
let signbit = 1'i64 shl (rc - 1) # 0x80
let toggle = mask - signbit # 0x7F
# algorithm: -((i8 and 0xFF) xor 0x7F) + 0x7F
# mask off higher bits.
# uses two's complement to sign-extend integer.
# reajust integer into desired range.
regs[ra].intVal = -((regs[rb].intVal and mask) xor toggle) + toggle
inc pc