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Merge pull request #425 from clbr/arrayaccess

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Add fast paths for char postinc/dec
This commit is contained in:
Oliver Schmidt 2017-05-09 19:26:41 +02:00 committed by GitHub
commit 0291c92ffb
2 changed files with 71 additions and 30 deletions
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78
src/cc65/expr.c
View File

@ -1534,26 +1534,35 @@ static void PostInc (ExprDesc* Expr)
/* Get the data type */
Flags = TypeOf (Expr->Type);
/* Push the address if needed */
PushAddr (Expr);
/* Emit smaller code if a char variable is at a constant location */
if ((Flags & CF_CHAR) == CF_CHAR && ED_IsLocConst(Expr)) {
/* Fetch the value and save it (since it's the result of the expression) */
LoadExpr (CF_NONE, Expr);
g_save (Flags | CF_FORCECHAR);
LoadExpr (CF_NONE, Expr);
AddCodeLine ("inc %s", ED_GetLabelName(Expr, 0));
/* If we have a pointer expression, increment by the size of the type */
if (IsTypePtr (Expr->Type)) {
g_inc (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
} else {
g_inc (Flags | CF_CONST | CF_FORCECHAR, 1);
/* Push the address if needed */
PushAddr (Expr);
/* Fetch the value and save it (since it's the result of the expression) */
LoadExpr (CF_NONE, Expr);
g_save (Flags | CF_FORCECHAR);
/* If we have a pointer expression, increment by the size of the type */
if (IsTypePtr (Expr->Type)) {
g_inc (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
} else {
g_inc (Flags | CF_CONST | CF_FORCECHAR, 1);
}
/* Store the result back */
Store (Expr, 0);
/* Restore the original value in the primary register */
g_restore (Flags | CF_FORCECHAR);
}
/* Store the result back */
Store (Expr, 0);
/* Restore the original value in the primary register */
g_restore (Flags | CF_FORCECHAR);
/* The result is always an expression, no reference */
ED_MakeRValExpr (Expr);
}
@ -1581,26 +1590,35 @@ static void PostDec (ExprDesc* Expr)
/* Get the data type */
Flags = TypeOf (Expr->Type);
/* Push the address if needed */
PushAddr (Expr);
/* Emit smaller code if a char variable is at a constant location */
if ((Flags & CF_CHAR) == CF_CHAR && ED_IsLocConst(Expr)) {
/* Fetch the value and save it (since it's the result of the expression) */
LoadExpr (CF_NONE, Expr);
g_save (Flags | CF_FORCECHAR);
LoadExpr (CF_NONE, Expr);
AddCodeLine ("dec %s", ED_GetLabelName(Expr, 0));
/* If we have a pointer expression, increment by the size of the type */
if (IsTypePtr (Expr->Type)) {
g_dec (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
} else {
g_dec (Flags | CF_CONST | CF_FORCECHAR, 1);
/* Push the address if needed */
PushAddr (Expr);
/* Fetch the value and save it (since it's the result of the expression) */
LoadExpr (CF_NONE, Expr);
g_save (Flags | CF_FORCECHAR);
/* If we have a pointer expression, increment by the size of the type */
if (IsTypePtr (Expr->Type)) {
g_dec (Flags | CF_CONST | CF_FORCECHAR, CheckedSizeOf (Expr->Type + 1));
} else {
g_dec (Flags | CF_CONST | CF_FORCECHAR, 1);
}
/* Store the result back */
Store (Expr, 0);
/* Restore the original value in the primary register */
g_restore (Flags | CF_FORCECHAR);
}
/* Store the result back */
Store (Expr, 0);
/* Restore the original value in the primary register */
g_restore (Flags | CF_FORCECHAR);
/* The result is always an expression, no reference */
ED_MakeRValExpr (Expr);
}

23
test/val/postincdec.c Normal file
View File

@ -0,0 +1,23 @@
/*
!!DESCRIPTION!! char-sized post-increment and -decrement
!!ORIGIN!! cc65 regression tests
!!LICENCE!! Public Domain
!!AUTHOR!! Lauri Kasanen
*/
static unsigned char val, array[2];
int main() {
val = 0;
array[0] = array[1] = 10;
array[val++] = 2;
array[val++] = 2;
--val;
array[val--] = 0;
array[val--] = 0;
return (array[0] == array[1] && array[0] == 0 && val == 0xff) ? 0 : 1;
}