aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--luxc/src/lux/compiler/js/rt.clj224
1 files changed, 220 insertions, 4 deletions
diff --git a/luxc/src/lux/compiler/js/rt.clj b/luxc/src/lux/compiler/js/rt.clj
index cdd83883d..1b07ed531 100644
--- a/luxc/src/lux/compiler/js/rt.clj
+++ b/luxc/src/lux/compiler/js/rt.clj
@@ -195,7 +195,7 @@
"divI64" (str "(function divI64(l,r) {"
(str "if((r.H === 0) && (r.L === 0)) {"
;; Special case: R = 0
- "throw Error('division by zero');"
+ "throw new Error('Cannot divide by zero!');"
"}"
"else if((l.H === 0) && (l.L === 0)) {"
;; Special case: L = 0
@@ -348,7 +348,223 @@
})
(def ^:private n64-methods
- {"encodeN64" (str "(function encodeN64(input) {"
+ {"divWord" (str "(function divWord(result, n, d) {"
+ "var dLong = LuxRT.makeI64(0,d);"
+ (str "if (LuxRT.eqI64(dLong,LuxRT.ONE)) {"
+ (str "result[0] = n.L;"
+ "result[1] = 0;"
+ "return")
+ "}"
+ "else {"
+ ;; Approximate the quotient and remainder
+ (str "var q = LuxRT.divI64(LuxRT.ushrI64(n,1),LuxRT.ushrI64(dLong,1));"
+ "var r = LuxRT.subI64(n,LuxRT.mulI64(q,dLong));"
+ ;; Correct the approximation
+ (str "while(LuxRT.ltI64(r,LuxRT.ZERO)) {"
+ "r = LuxRT.addI64(r,dLong);"
+ "q = LuxRT.subI64(q,LuxRT.ONE);"
+ "}")
+ (str "while(LuxRT.ltI64(dLong,r) || LuxRT.eqI64(dLong,r)) {"
+ "r = LuxRT.subI64(r,dLong);"
+ "q = LuxRT.addI64(q,LuxRT.ONE);"
+ "}")
+ "result[0] = q.L;"
+ "result[1] = r.L;"
+ )
+ "}")
+ "})")
+ "primitiveShiftLeftBigInt" (str "(function primitiveShiftLeftBigInt(input,shift) {"
+ "var output = input.slice();"
+ "var shift2 = 32 - shift;"
+ (str "for(var i = 0, c = output[i], m = (i + (input.length - 1)); i < m; i++) {"
+ "var b = c;"
+ "c = output[i+1];"
+ "output[i] = (b << shift) | (c >>> shift2);"
+ "}")
+ "output[(input.length - 1)] <<= shift;"
+ "return output;"
+ "})")
+ "primitiveShiftRightBigInt" (str "(function primitiveShiftRightBigInt(input,shift) {"
+ "var output = input.slice();"
+ "var shift2 = 32 - shift;"
+ (str "for(var i = (input.length - 1), c = output[i]; i > 0; i--) {"
+ "var b = c;"
+ "c = output[i-1];"
+ "output[i] = (c << shift2) | (b >>> shift);"
+ "}")
+ "output[0] >>>= shift;"
+ "return output;"
+ "})")
+ "shiftLeftBigInt" (str "(function shiftLeftBigInt(input,shift) {"
+ "var shiftInts = shift >>> 5;"
+ "var shiftBits = shift & 0x1F;"
+ "var bitsInHighWord = LuxRT.countI64(LuxRT.makeI64(input[0],0));"
+ (str "if(shift <= (32 - bitsInHighWord)) {"
+ "var shifted = LuxRT.shlI64(LuxRT.makeI64(input[0],input[1]),shiftBits);"
+ "return [shifted.H,shifted.L];"
+ "}")
+ "var inputLen = input[0] === 0 ? 1 : 2;"
+ "var newLen = inputLen + shiftInts + 1;"
+ (str "if(shiftBits <= (32 - bitsInHighWord)) {"
+ "newLen--;"
+ "}")
+ (str "if(input.length < newLen) {"
+ ;; The array must grow
+ "input = [0|0,input[0],input[1]];"
+ "}")
+ (str "if(nBits == 0) {"
+ "return input;"
+ "}")
+ (str "if(shiftBits <= (32 - bitsInHighWord)) {"
+ "return LuxRT.primitiveShiftLeftBigInt(input,shiftBits);"
+ "}"
+ "else {"
+ "return LuxRT.primitiveShiftRightBigInt(input,(32 - shiftBits));"
+ "}")
+ "})")
+ "shiftRightBigInt" (str "(function shiftRightBigInt(input,shift) {"
+ "var shiftInts = shift >>> 5;"
+ "var shiftBits = shift & 0x1F;"
+ "if(shiftBits === 0) { return input; }"
+ "var bitsInHighWord = LuxRT.countI64(LuxRT.makeI64(input[0],0));"
+ (str "if(shiftBits >= bitsInHighWord) {"
+ "return LuxRT.primitiveShiftLeftBigInt(input,(32-shiftBits));"
+ "}"
+ "else {"
+ "return LuxRT.primitiveShiftRightBigInt(input,shiftBits);"
+ "}")
+ "})")
+ "mulsubBigInt" (str "(function mulsubBigInt(q, a, x, len, offset) {"
+ "var xLong = LuxRT.makeI64(0,x);"
+ "var carry = LuxRT.ZERO;"
+ "offset += len;"
+ (str "for (var j = len-1; j >= 0; j--) {"
+ "var product = LuxRT.addI64(LuxRT.mulI64(LuxRT.makeI64(0,a[j]),xLong),carry);"
+ "var difference = LuxRT.subI64(LuxRT.makeI64(0,q[offset]),product);"
+ "carry = LuxRT.addI64(LuxRT.ushrI64(product,32),((difference.L > ~product.L) ? LuxRT.ONE : LuxRT.ZERO));"
+ "}")
+ "return carry.L;"
+ "})")
+ "divadd" (str "(function divadd(a, result, offset) {"
+ "var carry = LuxRT.ZERO;"
+ (str "for (var j = a.length - 1; j >= 0; j--) {"
+ "var sum = LuxRT.addI64(LuxRT.addI64(LuxRT.makeI64(0,a[j]),LuxRT.makeI64(0,result[j+offset])),carry);"
+ "result[j+offset] = sum.L;"
+ "carry = LuxRT.ushrI64(sum,32);"
+ "}")
+ "return carry.L;"
+ "})")
+ "normalizeBigInt" (str "(function normalizeBigInt(input) {"
+ (str "if(input[0] !== 0) {"
+ "return LuxRT.makeI64(input[0],input[1]);"
+ "}"
+ "else {"
+ (str "var numZeros = 0;"
+ (str "do {"
+ "numZeros++;"
+ "} while(numZeros < input.length && input[numZeros] == 0);")
+ "var tempInput = input.slice(input.length-Math.max(2,input.length-numZeros));"
+ "return LuxRT.makeI64(tempInput[0],tempInput[1]);")
+ "}")
+ "})")
+ "divmodBigInt" (str "(function divmodBigInt(subject,param) {"
+ (str "if(LuxRT.eqI64(param,LuxRT.ZERO)) {"
+ "throw new Error('Cannot divide by zero!');"
+ "}")
+ (str "if(LuxRT.eqI64(subject,LuxRT.ZERO)) {"
+ "return [LuxRT.ZERO, LuxRT.ZERO];"
+ "}")
+ (str "if(LuxRT.ltN64(subject,param)) {"
+ "return [LuxRT.ZERO, subject];"
+ "}")
+ (str "if(LuxRT.eqI64(subject,param)) {"
+ "return [LuxRT.ONE, LuxRT.ZERO];"
+ "}")
+ ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+ "var divisor = param;"
+ "var remainder = subject.H === 0 ? [0|0,subject.L] : [0|0,subject.H,subject.L];"
+ "var paramLength = param.H === 0 ? 1 : 2;"
+ "var subjLength = subject.H === 0 ? 1 : 2;"
+ "var limit = subjLength - paramLength + 1;"
+ "var quotient = (limit === 1) ? [0|0] : [0|0,0|0];"
+ ;; Normalize the divisor
+ "var shift = 32 - LuxRT.countI64(LuxRT.makeI64(divisor.H,0));"
+ (str "if (shift > 0) {"
+ "divisor = LuxRT.shlI64(divisor,shift);"
+ "remainder = LuxRT.shiftLeftBigInt(remainder,shift);"
+ "}")
+ (str "if((remainder.length-1) === subjLength) {"
+ "remainder[0] = 0;"
+ "}")
+ "var dh = divisor.H;"
+ "var dhLong = LuxRT.makeI64(0,dh);"
+ "var dl = divisor.L;"
+ "var qWord = [0|0,0|0];"
+ ;; D2 Initialize j
+ (str "for(var j = 0; j < limit; j++) {"
+ ;; D3 Calculate qhat
+ ;; estimate qhat
+ "var qhat = 0;"
+ "var qrem = 0;"
+ "var skipCorrection = false;"
+ "var nh = remainder[j];"
+ "var nh2 = nh + 0x80000000;"
+ "var nm = remainder[j+1];"
+ (str "if(nh == dh) {"
+ (str "qhat = ~0;"
+ "qrem = nh + nm;"
+ "skipCorrection = (qrem + 0x80000000) < nh2;")
+ "}"
+ "else {"
+ (str "var nChunk = LuxRT.orI64(LuxRT.shlI64(LuxRT.fromNumberI64(nh),32),LuxRT.fromNumberI64(nm));")
+ (str "if(LuxRT.ltI64(LuxRT.ZERO,nChunk) || LuxRT.eqI64(LuxRT.ZERO,nChunk)) {"
+ (str "qhat = LuxRT.divI64(nChunk,dhLong).L;"
+ "qrem = LuxRT.subI64(nChunk,LuxRT.mulI64(qhat, dhLong)).L;")
+ "}"
+ "else {"
+ (str "LuxRT.divWord(qWord, nChunk, dh);"
+ "qhat = qWord[0];"
+ "qrem = qWord[1];"
+ )
+ "}")
+ "if(qhat == 0) { continue; }"
+ (str "if(!skipCorrection) {"
+ ;; Correct qhat
+ (str "var qremLong = LuxRT.makeI64(0,qrem);"
+ "var dlLong = LuxRT.makeI64(0,dl);"
+ "var nl = LuxRT.makeI64(0,remainder[j+2]);"
+ "var rs = LuxRT.orI64(LuxRT.shlI64(qremLong,32),nl);"
+ "var estProduct = LuxRT.mulI64(dlLong,LuxRT.makeI64(0,qhat));"
+ (str "if(LuxRT.ltN64(rs,estProduct)) {"
+ (str "qhat--;"
+ "qrem = LuxRT.addI64(qremLong,dhLong).L;"
+ "qremLong = LuxRT.makeI64(0,qrem);"
+ (str "if(LuxRT.ltI64(dhLong,qremLong) || LuxRT.eqI64(dhLong,qremLong)) {"
+ (str "estProduct = LuxRT.mulI64(dlLong,LuxRT.makeI64(0,qhat));"
+ "rs = LuxRT.orI64(LuxRT.shlI64(qremLong,32),nl);"
+ "if(LuxRT.ltN64(rs,estProduct)) { qhat--; }")
+ "}"))
+ "}")
+ )
+ "}")
+ ;; D4 Multiply and subtract
+ "remainder[j] = 0;"
+ "var borrow = LuxRT.mulsubBigInt(remainder, divisor, qhat, paramLength, j);"
+ ;; D5 Test remainder
+ (str "if (borrow + 0x80000000 > nh2) {"
+ ;; D6 Add back
+ "LuxRT.divadd(divisor, remainder, j+1);"
+ "qhat--;"
+ "}")
+ ;; Store the quotient digit
+ "quotient[j] = qhat;"
+ "}")
+ "}") ;; D7 loop on j
+ ;; D8 Unnormalize
+ "if(shift > 0) { remainder = LuxRT.shiftRightBigInt(remainder,shift); }"
+ "return [LuxRT.normalizeBigInt(quotient), LuxRT.normalizeBigInt(remainder)];"
+ "})")
+ "encodeN64" (str "(function encodeN64(input) {"
(str "if(input.H < 0) {"
;; Too big
"var lastDigit = LuxRT.remI64(input, LuxRT.makeI64(0,10));"
@@ -406,7 +622,7 @@
"return LuxRT.ZERO;"
"}"
"else {"
- "throw new Error('AWAITING BIG-INT DIVISION IMPLEMENTATION!!!');"
+ "return LuxRT.divmodBigInt(l,r)[0];"
"}")
"}")
"}")
@@ -417,7 +633,7 @@
"return l;"
"}"
"else {"
- "throw new Error('AWAITING BIG-INT REMAINDER IMPLEMENTATION!!!');"
+ "return LuxRT.divmodBigInt(l,r)[1];"
"}")
"}"
"else {"
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 07:38:56 +0000