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Added code to handle the special case of a zero-length move.
Added more tests of memcpy() and memmove().
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@ -4,7 +4,7 @@
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; block-copy instructions.
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; block-copy instructions.
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;
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;
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; 2003-08-20, Ullrich von Bassewitz
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; 2003-08-20, Ullrich von Bassewitz
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; 2015-10-11, Greg King
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; 2015-11-02, Greg King
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;
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;
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; void* __fastcall__ memcpy (void* dest, const void* src, size_t size);
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; void* __fastcall__ memcpy (void* dest, const void* src, size_t size);
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;
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;
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@ -16,7 +16,7 @@
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.export _memcpy
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.export _memcpy
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.export memcpy_increment, memcpy_transfer, memcpy_getparams
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.export memcpy_increment, memcpy_transfer, memcpy_getparams
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.import popax
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.import incsp2, popax
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.importzp sp, ptr1, ptr2, ptr3
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.importzp sp, ptr1, ptr2, ptr3
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@ -68,12 +68,23 @@ memcpy_transfer:
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memcpy_getparams:
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memcpy_getparams:
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sta ptr3
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sta ptr3
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stx ptr3+1 ; save size
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stx ptr3+1 ; save size
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ora ptr3+1
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bne @L1
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jsr popax
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; The size is zero; copy nothing; just return the dest address.
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; (The HuC6280's transfer instructions can't copy $0000 bytes;
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; they would copy $10000 [64K] bytes instead.)
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ply ; drop return address
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plx
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jsr incsp2 ; drop src address
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jmp popax ; get pointer; return it as result
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@L1: jsr popax
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sta ptr1
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sta ptr1
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stx ptr1+1 ; save src
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stx ptr1+1 ; save src
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; (Direct stack access is four cycles faster [total cycle count].)
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; (Direct stack access is six cycles faster [total cycle count].)
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ldy #1 ; save dest
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ldy #1 ; save dest
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lda (sp),y ; get high byte
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lda (sp),y ; get high byte
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@ -85,10 +96,10 @@ memcpy_getparams:
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; ----------------------------------------------------------------------
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; ----------------------------------------------------------------------
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; The transfer instructions use inline arguments.
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; The transfer instructions use inline arguments.
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; Therefore, we must build the instruction in the DATA segment.
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; Therefore, we must build the instruction, in the DATA segment.
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.data
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.data
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transfer:
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transfer:
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tii $FFFF, $FFFF, $0001
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tii $FFFF, $FFFF, $0001
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jmp popax ; get pointer; and, return it as result
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jmp popax ; get pointer; return it as result
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@ -1,3 +1,4 @@
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.PHONY: all clean test
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all: conio.pce
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all: conio.pce
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@ -5,9 +6,7 @@ conio.pce: conio.c
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../../../bin/cl65 -t pce conio.c --mapfile conio.map -o conio.pce
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../../../bin/cl65 -t pce conio.c --mapfile conio.map -o conio.pce
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clean:
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clean:
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$(RM) conio.pce
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$(RM) conio.o conio.pce conio.map
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$(RM) conio.map
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test: conio.pce
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test: conio.pce
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mednafen -force_module pce conio.pce
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mednafen -force_module pce conio.pce
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@ -1,4 +1,3 @@
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#include <conio.h>
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#include <conio.h>
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#include <time.h>
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#include <time.h>
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#include <joystick.h>
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#include <joystick.h>
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@ -13,7 +12,7 @@ void main(void)
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int i, j;
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int i, j;
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clock_t clk;
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clock_t clk;
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char* p;
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char* p;
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unsigned char xsize, ysize, n;
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unsigned char xsize, ysize, n, nn;
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joy_install(&joy_static_stddrv);
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joy_install(&joy_static_stddrv);
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@ -40,11 +39,12 @@ void main(void)
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gotoxy(0, 16 + i);
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gotoxy(0, 16 + i);
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p = malloc(16);
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p = malloc(16);
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memcpy(p, "0123456789abcdef", 16);
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memcpy(p, "0123456789abcdef", 16);
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cprintf("alloced at: %04p - %c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c", p,
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cprintf("alloc'ed at: %04p - %c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c", p,
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p[0],p[1],p[2],p[3],p[4],p[5],p[6],p[7],
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p[0],p[1],p[2],p[3],p[4],p[5],p[6],p[7],
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p[8],p[9],p[10],p[11],p[12],p[13],p[14],p[15]
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p[8],p[9],p[10],p[11],p[12],p[13],p[14],p[15]
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);
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);
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}
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}
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memcpy(p, main, 0); /* test that a zero length doesn't copy 64K */
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gotoxy(0,ysize - 1);
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gotoxy(0,ysize - 1);
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for (i = 0; i < xsize; ++i) {
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for (i = 0; i < xsize; ++i) {
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@ -108,14 +108,22 @@ void main(void)
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}
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}
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gotoxy(xsize - 10, 3);
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gotoxy(xsize - 10, 3);
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j = (n >> 5) & 1;
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nn = (n >> 5) & 1;
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revers(j);
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revers(nn);
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cputc(j ? 'R' : ' ');
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cputc(nn ? 'R' : ' ');
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cputs(" revers");
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cputs(" revers");
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revers(0);
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revers(0);
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if ((n & 0x1f) == 0x00) {
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nn = p[15];
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((char*)memmove(p + 1, p, 15))[-1] = nn;
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gotoxy(22, 19);
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cprintf("%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c",
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p[0],p[1],p[ 2],p[ 3],p[ 4],p[ 5],p[ 6],p[ 7],
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p[8],p[9],p[10],p[11],p[12],p[13],p[14],p[15]);
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}
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waitvblank();
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waitvblank();
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++n;
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++n;
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}
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}
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for(;;);
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}
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}
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