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use signed comparisons for the index checking in the hope it improves the code generation (#19712)

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This commit is contained in:
Andreas Rumpf
2022-04-26 08:58:15 +02:00
committed by GitHub
parent 82680a12a7
commit ef4ac5a0d2
1 changed files with 7 additions and 7 deletions
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14
compiler/ccgexprs.nim
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@@ -988,12 +988,12 @@ proc genBoundsCheck(p: BProc; arr, a, b: TLoc) =
if reifiedOpenArray(arr.lode):
linefmt(p, cpsStmts,
"if ($2-$1 != -1 && " &
"((NU)($1) >= (NU)($3.Field1) || (NU)($2) >= (NU)($3.Field1))){ #raiseIndexError(); $4}$n",
"($1 < 0 || $1 >= $3.Field1 || $2 < 0 || $2 >= $3.Field1)){ #raiseIndexError(); $4}$n",
[rdLoc(a), rdLoc(b), rdLoc(arr), raiseInstr(p)])
else:
linefmt(p, cpsStmts,
"if ($2-$1 != -1 && " &
"((NU)($1) >= (NU)($3Len_0) || (NU)($2) >= (NU)($3Len_0))){ #raiseIndexError(); $4}$n",
"if ($2-$1 != -1 && ($1 < 0 || $1 >= $3Len_0 || $2 < 0 || $2 >= $3Len_0))" &
"{ #raiseIndexError(); $4}$n",
[rdLoc(a), rdLoc(b), rdLoc(arr), raiseInstr(p)])
of tyArray:
let first = intLiteral(firstOrd(p.config, ty))
@@ -1004,7 +1004,7 @@ proc genBoundsCheck(p: BProc; arr, a, b: TLoc) =
of tySequence, tyString:
linefmt(p, cpsStmts,
"if ($2-$1 != -1 && " &
"((NU)($1) >= (NU)$3 || (NU)($2) >= (NU)$3)){ #raiseIndexError(); $4}$n",
"($1 < 0 || $1 >= $3 || $2 < 0 || $2 >= $3)){ #raiseIndexError(); $4}$n",
[rdLoc(a), rdLoc(b), lenExpr(p, arr), raiseInstr(p)])
else: discard
@@ -1015,14 +1015,14 @@ proc genOpenArrayElem(p: BProc, n, x, y: PNode, d: var TLoc) =
if not reifiedOpenArray(x):
# emit range check:
if optBoundsCheck in p.options:
linefmt(p, cpsStmts, "if ((NU)($1) >= (NU)($2Len_0)){ #raiseIndexError2($1,$2Len_0-1); $3}$n",
linefmt(p, cpsStmts, "if ($1 < 0 || $1 >= $2Len_0){ #raiseIndexError2($1,$2Len_0-1); $3}$n",
[rdCharLoc(b), rdLoc(a), raiseInstr(p)]) # BUGFIX: ``>=`` and not ``>``!
inheritLocation(d, a)
putIntoDest(p, d, n,
ropecg(p.module, "$1[$2]", [rdLoc(a), rdCharLoc(b)]), a.storage)
else:
if optBoundsCheck in p.options:
linefmt(p, cpsStmts, "if ((NU)($1) >= (NU)($2.Field1)){ #raiseIndexError2($1,$2.Field1-1); $3}$n",
linefmt(p, cpsStmts, "if ($1 < 0 || $1 >= $2.Field1){ #raiseIndexError2($1,$2.Field1-1); $3}$n",
[rdCharLoc(b), rdLoc(a), raiseInstr(p)]) # BUGFIX: ``>=`` and not ``>``!
inheritLocation(d, a)
putIntoDest(p, d, n,
@@ -1037,7 +1037,7 @@ proc genSeqElem(p: BProc, n, x, y: PNode, d: var TLoc) =
ty = skipTypes(ty.lastSon, abstractVarRange) # emit range check:
if optBoundsCheck in p.options:
linefmt(p, cpsStmts,
"if ((NU)($1) >= (NU)$2){ #raiseIndexError2($1,$2-1); $3}$n",
"if ($1 < 0 || $1 >= $2){ #raiseIndexError2($1,$2-1); $3}$n",
[rdCharLoc(b), lenExpr(p, a), raiseInstr(p)])
if d.k == locNone: d.storage = OnHeap
if skipTypes(a.t, abstractVar).kind in {tyRef, tyPtr}: