Hi,
Maybe we got a rare bug of CGT compiler, detailed as below:
Compiler: CGT7.2.3 and CGT7.2.4
Platform: DM6467T
Description:
1) Please see the attachment for the function my_testfunc();
2) It works ok with compiler options -O0 and -O1
3) Failes with -O2 or -O3
4) For most of s_data1/s_data2 , the function works ok with -O2 and -O3
5) But for some rare piece of s_data1/s_data2 , it failes. The s_data1/s_data2 in the attachment is a sample which casue the function fail.
Any one can give some hint to resolve the problem?
Thanks!
#include <stdlib.h>
// SAD
// OK: sum = 4300 // -O0, -O1
// FAIL sum = 4044 // -02, -O3
static unsigned char s_data1[] =
{
53,53,53,53,53,53,53,53,
84,84,84,84,84,84,84,84,
101,101,101,101,101,101,101,101,
49,49,49,49,49,49,49,49,
44,44,44,44,44,44,44,44,
46,46,46,46,46,46,46,46,
43,43,43,43,43,43,43,43,
101,101,101,101,101,101,101,101
};
static unsigned char s_data2[] =
{
73,82,114,155,154,154,151,157,
118,123,144,157,160,168,156,162,
73,104,155,159,154,158,156,159,
52,58,138,161,158,168,162,167,
48,56,108,164,155,160,157,166,
46,54,88,165,159,164,159,157,
44,48,81,161,172,169,169,164,
88,97,84,94,129,125,142,147
};
int my_testfunc(void)
{
int sum = 0, x, y;
unsigned char *data1 = s_data1;
unsigned char *data2 = s_data2;
for (y = 0; y < 8; y++)
{
for (x = 0; x < 8; x++)
{
sum += abs(data1[x] - data2[x]);
}
data1 += 8;
data2 += 8;
}
return sum;
}
################################################################################ # Automatically-generated file. Do not edit! ################################################################################ # Each subdirectory must supply rules for building sources it contributes mytest.obj: ../mytest.c $(GEN_OPTS) $(GEN_SRCS) $(CFG_SRCS) @echo 'Building file: $<' @echo 'Invoking: Compiler' "C:/ccs4/ccsv4/tools/compiler/c6000/bin/cl6x" -mv64+ --symdebug:none -O2 --relaxed_ansi --gcc --define="xdc_target__=<ti/targets/std.h>" --include_path="C:/ccs4/ccsv4/tools/compiler/c6000/include" --include_path="C:/ccs4/xdais_6_25_02_11/packages" --include_path="C:/ccs4/xdctools_3_16_01_27/packages" --diag_warning=225 --abi=coffabi --opt_for_speed=5 --preproc_with_compile --preproc_dependency="mytest.pp" $(GEN_OPTS_QUOTED) $(subst #,$(wildcard $(subst $(SPACE),\$(SPACE),$<)),"#") @echo 'Finished building: $<' @echo ' '
