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fix aggressive loop optimizations

Browse Source 
Previously, aggressive loop optimizations with a new compiler were not
possible due to undefined behaviour at end of arrays.

A macro "UBFIX" is added to allow ifdefs for fixes which resolve
undefined behavior. For example newer GCC versions will detect various
bugs in the original game code and will otherwise not compile with -Werror.
This commit is contained in:
Michael Panzlaff 2020-05-09 14:49:51 +02:00
parent 46f4a4bbf7
commit 3264cf697f
10 changed files with 79 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Makefile
View File

@ -67,7 +67,7 @@ OBJ_DIR := build/emerald
LIBPATH := -L ../../tools/agbcc/lib
else
CC1 = $(shell $(CC) --print-prog-name=cc1) -quiet
override CFLAGS += -mthumb -mthumb-interwork -O2 -mabi=apcs-gnu -mtune=arm7tdmi -march=armv4t -fno-toplevel-reorder -fno-aggressive-loop-optimizations -Wno-pointer-to-int-cast
override CFLAGS += -mthumb -mthumb-interwork -O2 -mabi=apcs-gnu -mtune=arm7tdmi -march=armv4t -fno-toplevel-reorder -Wno-pointer-to-int-cast
ROM := pokeemerald_modern.gba
OBJ_DIR := build/modern
LIBPATH := -L "$(dir $(shell $(CC) -mthumb -print-file-name=libgcc.a))" -L "$(dir $(shell $(CC) -mthumb -print-file-name=libc.a))"
@ -232,7 +232,7 @@ $(C_BUILDDIR)/record_mixing.o: CFLAGS += -ffreestanding
$(C_BUILDDIR)/librfu_intr.o: CC1 := tools/agbcc/bin/agbcc_arm
$(C_BUILDDIR)/librfu_intr.o: CFLAGS := -O2 -mthumb-interwork -quiet
else
$(C_BUILDDIR)/librfu_intr.o: CFLAGS := -mthumb-interwork -O2 -mabi=apcs-gnu -mtune=arm7tdmi -march=armv4t -fno-toplevel-reorder -fno-aggressive-loop-optimizations -Wno-pointer-to-int-cast
$(C_BUILDDIR)/librfu_intr.o: CFLAGS := -mthumb-interwork -O2 -mabi=apcs-gnu -mtune=arm7tdmi -march=armv4t -fno-toplevel-reorder -Wno-pointer-to-int-cast
endif
ifeq ($(NODEP),1)

8
include/config.h
View File

@ -26,4 +26,12 @@
#define UNITS_METRIC
#endif
// Various undefined behavior bugs may or may not prevent compilation with
// newer compilers. So always fix them when using a modern compiler.
#if MODERN
#ifndef UBFIX
#define UBFIX
#endif
#endif
#endif // GUARD_CONFIG_H

7
include/global.tv.h
View File

@ -18,6 +18,13 @@ typedef union // size = 0x24
/*0x23*/ u8 trainerIdHi;
} common;
// Common init (used for initialization loop)
struct {
/*0x00*/ u8 kind;
/*0x01*/ bool8 active;
/*0x02*/ u8 pad02[34];
} commonInit;
// Local shows
// TVSHOW_FAN_CLUB_LETTER
struct {

5
src/berry_blender.c
View File

@ -2202,6 +2202,11 @@ static s16 sub_8081BD4(void)
return sUnknown_03000E06;
}
#if MODERN
// TODO remove this as soon as the code below is understood
// add a UBFIX if required (code buggy?)
__attribute__((optimize("no-aggressive-loop-optimizations")))
#endif
static void Blender_CalculatePokeblock(struct BlenderBerry *berries, struct Pokeblock *pokeblock, u8 playersNo, u8 *flavors, u16 maxRPM)
{
s32 i, j;

5
src/berry_crush.c
View File

@ -3209,6 +3209,11 @@ static u32 sub_8024568(__attribute__((unused)) struct BerryCrushGame *r0, __attr
return 0;
}
#if MODERN
// TODO remove this as soon as the code below is understood
// add a UBFIX if required (code buggy?)
__attribute__((optimize("no-aggressive-loop-optimizations")))
#endif
void sub_8024578(struct BerryCrushGame *r4)
{
u8 r5 = 0;

5
src/easy_chat.c
View File

@ -5273,12 +5273,17 @@ void InitEasyChatPhrases(void)
gSaveBlock1Ptr->mail[i].words[j] = 0xFFFF;
}
#ifndef UBFIX
// BUG: This is supposed to clear 64 bits, but this loop is clearing 64 bytes.
// However, this bug has no resulting effect on gameplay because only the
// Mauville old man data is corrupted, which is initialized directly after
// this function is called when starting a new game.
for (i = 0; i < 64; i++)
gSaveBlock1Ptr->additionalPhrases[i] = 0;
#else
for (i = 0; i < ARRAY_COUNT(gSaveBlock1Ptr->additionalPhrases); i++)
gSaveBlock1Ptr->additionalPhrases[i] = 0;
#endif
}
static bool8 sub_811F28C(void)

7
src/fieldmap.c
View File

@ -533,9 +533,16 @@ static bool32 SavedMapViewIsEmpty(void)
u16 i;
u32 marker = 0;
#ifndef UBFIX
// BUG: This loop extends past the bounds of the mapView array. Its size is only 0x100.
for (i = 0; i < 0x200; i++)
marker |= gSaveBlock1Ptr->mapView[i];
#else
// UBFIX: Only iterate over 0x100
for (i = 0; i < ARRAY_COUNT(gSaveBlock1Ptr->mapView); i++)
marker |= gSaveBlock1Ptr->mapView[i];
#endif
if (marker == 0)
return TRUE;

44
src/image_processing_effects.c
View File

@ -5,7 +5,7 @@
// IWRAM common
u8 gCanvasColumnStart;
u16 (*gCanvasPixels)[][32];
u16 *gCanvasPixels;
u8 gCanvasRowEnd;
u8 gCanvasHeight;
u8 gCanvasColumnEnd;
@ -125,7 +125,7 @@ static void ApplyImageEffect_RedChannelGrayscale(u8 delta)
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
@ -150,7 +150,7 @@ static void ApplyImageEffect_RedChannelGrayscaleHighlight(u8 highlight)
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
@ -179,7 +179,7 @@ static void ApplyImageEffect_Grayscale(void)
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
@ -195,7 +195,7 @@ static void ApplyImageEffect_Blur(void)
for (i = 0; i < gCanvasColumnEnd; i++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][gCanvasRowStart * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[gCanvasRowStart * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart + i];
u16 prevPixel = *pixel;
@ -221,7 +221,7 @@ static void ApplyImageEffect_PersonalityColor(u8 personality)
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
@ -237,7 +237,7 @@ static void ApplyImageEffect_BlackAndWhite(void)
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
@ -255,7 +255,7 @@ static void ApplyImageEffect_BlackOutline(void)
// Handle top row of pixels first.
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
pixel = &pixelRow[gCanvasColumnStart];
*pixel = QuantizePixel_BlackOutline(pixel, pixel + 1);
for (i = 1, pixel++; i < gCanvasColumnEnd - 1; i++, pixel++)
@ -270,7 +270,7 @@ static void ApplyImageEffect_BlackOutline(void)
// Handle each column from left to right.
for (i = 0; i < gCanvasColumnEnd; i++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][gCanvasRowStart * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[gCanvasRowStart * gCanvasWidth];
pixel = &pixelRow[gCanvasColumnStart + i];
*pixel = QuantizePixel_BlackOutline(pixel, pixel + gCanvasWidth);
for (j = 1, pixel += gCanvasWidth; j < gCanvasRowEnd - 1; j++, pixel += gCanvasWidth)
@ -289,7 +289,7 @@ static void ApplyImageEffect_Invert(void)
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
@ -306,7 +306,7 @@ static void ApplyImageEffect_Shimmer(void)
u16 prevPixel;
// First, invert all of the colors.
pixel = (*gCanvasPixels)[0];
pixel = gCanvasPixels;
for (i = 0; i < 64; i++)
{
for (j = 0; j < 64; j++, pixel++)
@ -319,7 +319,7 @@ static void ApplyImageEffect_Shimmer(void)
// Blur the pixels twice.
for (j = 0; j < 64; j++)
{
pixel = &(*gCanvasPixels)[0][j];
pixel = &gCanvasPixels[j];
prevPixel = *pixel;
*pixel = 0x8000;
for (i = 1, pixel += 64; i < 63; i++, pixel += 64)
@ -332,7 +332,7 @@ static void ApplyImageEffect_Shimmer(void)
}
*pixel = 0x8000;
pixel = &(*gCanvasPixels)[0][j];
pixel = &gCanvasPixels[j];
prevPixel = *pixel;
*pixel = 0x8000;
for (i = 1, pixel += 64; i < 63; i++, pixel += 64)
@ -350,7 +350,7 @@ static void ApplyImageEffect_Shimmer(void)
// Finally, invert colors back to the original color space.
// The above blur causes the outline areas to darken, which makes
// this inversion give the effect of light outlines.
pixel = (*gCanvasPixels)[0];
pixel = gCanvasPixels;
for (i = 0; i < 64; i++)
{
for (j = 0; j < 64; j++, pixel++)
@ -367,7 +367,7 @@ static void ApplyImageEffect_BlurRight(void)
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
u16 prevPixel = *pixel;
for (i = 1, pixel++; i < gCanvasColumnEnd - 1; i++, pixel++)
@ -387,7 +387,7 @@ static void ApplyImageEffect_BlurDown(void)
for (i = 0; i < gCanvasColumnEnd; i++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][gCanvasRowStart * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[gCanvasRowStart * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart + i];
u16 prevPixel = *pixel;
for (j = 1, pixel += gCanvasWidth; j < gCanvasRowEnd - 1; j++, pixel += gCanvasWidth)
@ -445,7 +445,7 @@ static void AddPointillismPoints(u16 arg0)
for (i = 0; i < points[0].delta; i++)
{
u16 *pixel = &(*gCanvasPixels)[points[i].row * 2][points[i].column];
u16 *pixel = &gCanvasPixels[points[i].row * 64] + points[i].column;
if (!(0x8000 & *pixel))
{
@ -910,7 +910,7 @@ static void QuantizePalette_Standard(bool8 useLimitedPalette)
gCanvasPalette[maxIndex] = RGB2(15, 15, 15);
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
@ -978,7 +978,7 @@ static void QuantizePalette_BlackAndWhite(void)
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
@ -1009,7 +1009,7 @@ static void QuantizePalette_GrayscaleSmall(void)
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
@ -1027,7 +1027,7 @@ static void QuantizePalette_Grayscale(void)
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{
@ -1045,7 +1045,7 @@ static void QuantizePalette_PrimaryColors(void)
for (j = 0; j < gCanvasRowEnd; j++)
{
u16 *pixelRow = &(*gCanvasPixels)[0][(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixelRow = &gCanvasPixels[(gCanvasRowStart + j) * gCanvasWidth];
u16 *pixel = &pixelRow[gCanvasColumnStart];
for (i = 0; i < gCanvasColumnEnd; i++, pixel++)
{

23
src/slot_machine.c
View File

@ -384,7 +384,7 @@ static const u16 gSlotPayouts[];
static const u8 *const gUnknown_083EDCE4;
static const u8 *const gUnknown_083EDCDC;
static const u32 gReelTimeGfx[];
static const struct SpriteSheet gSlotMachineSpriteSheets[];
static const struct SpriteSheet gSlotMachineSpriteSheets[22];
static const struct SpritePalette gSlotMachineSpritePalettes[];
static const u16 *const gUnknown_083EDE20;
static const s16 gInitialReelPositions[][2];
@ -4171,8 +4171,8 @@ static void sub_81063C0(void)
LZDecompressWram(gSlotMachineReelTime_Gfx, sUnknown_0203AAD4);
sUnknown_0203AAD8 = Alloc(0x3600);
LZDecompressWram(gReelTimeGfx, sUnknown_0203AAD8);
sUnknown_0203AB30 = AllocZeroed(sizeof(struct SpriteSheet) * 22);
for (i = 0; i < 22; i++)
sUnknown_0203AB30 = AllocZeroed(sizeof(struct SpriteSheet) * ARRAY_COUNT(gSlotMachineSpriteSheets));
for (i = 0; i < ARRAY_COUNT(gSlotMachineSpriteSheets); i++)
{
sUnknown_0203AB30[i].data = gSlotMachineSpriteSheets[i].data;
sUnknown_0203AB30[i].size = gSlotMachineSpriteSheets[i].size;
@ -6708,7 +6708,7 @@ static const struct SubspriteTable *const gUnknown_083EDBC4[] =
NULL
};
static const struct SpriteSheet gSlotMachineSpriteSheets[] =
static const struct SpriteSheet gSlotMachineSpriteSheets[22] =
{
{ .data = gSlotMachineReelSymbol1Tiles, .size = 0x200, .tag = 0 },
{ .data = gSlotMachineReelSymbol2Tiles, .size = 0x200, .tag = 1 },
@ -6727,15 +6727,12 @@ static const struct SpriteSheet gSlotMachineSpriteSheets[] =
{ .data = gSlotMachineNumber7Tiles, .size = 0x40, .tag = 14 },
{ .data = gSlotMachineNumber8Tiles, .size = 0x40, .tag = 15 },
{ .data = gSlotMachineNumber9Tiles, .size = 0x40, .tag = 16 },
};
static const u8 sUnused1[][8] =
{
{0, 0, 0, 0, 0, 2, 18},
{0, 0, 0, 0, 0, 2, 19},
{0, 0, 0, 0, 0, 3, 20},
{0, 0, 0, 0, 0, 3, 21},
{0, 0, 0, 0, 0, 0, 0}
// the data for these sheets is determined at runtime
{ .data = NULL, .size = 0x200, .tag = 18 },
{ .data = NULL, .size = 0x200, .tag = 19 },
{ .data = NULL, .size = 0x300, .tag = 20 },
{ .data = NULL, .size = 0x300, .tag = 21 },
{},
};
static const u8 *const gUnknown_083EDCDC = gUnknown_08DD19F8;

16
src/tv.c
View File

@ -764,11 +764,11 @@ void ClearTVShowData(void)
for (i = 0; i < ARRAY_COUNT(gSaveBlock1Ptr->tvShows); i ++)
{
gSaveBlock1Ptr->tvShows[i].common.kind = 0;
gSaveBlock1Ptr->tvShows[i].common.active = 0;
for (j = 0; j < sizeof(TVShow) - 2; j ++)
gSaveBlock1Ptr->tvShows[i].commonInit.kind = 0;
gSaveBlock1Ptr->tvShows[i].commonInit.active = 0;
for (j = 0; j < ARRAY_COUNT(gSaveBlock1Ptr->tvShows[i].commonInit.pad02); j ++)
{
gSaveBlock1Ptr->tvShows[i].common.pad02[j] = 0;
gSaveBlock1Ptr->tvShows[i].commonInit.pad02[j] = 0;
}
}
ClearPokemonNews();
@ -3167,11 +3167,11 @@ void DeleteTVShowInArrayByIdx(TVShow *shows, u8 idx)
{
u8 i;
shows[idx].common.kind = TVSHOW_OFF_AIR;
shows[idx].common.active = FALSE;
for (i = 0; i < 34; i ++)
shows[idx].commonInit.kind = TVSHOW_OFF_AIR;
shows[idx].commonInit.active = FALSE;
for (i = 0; i < ARRAY_COUNT(shows[idx].commonInit.pad02); i++)
{
shows[idx].common.pad02[i] = 0;
shows[idx].commonInit.pad02[i] = 0;
}
}