Compiler Ti v6.4.2, v6.2.10, v6.2.7 have problems with floating-point on optimization level 2 and above.

float calc(float *A, float *B,float *C)
{
int i,j;
float Temp;
for (i=0;i<10;i++)
{
Temp=A[i];
for(j=0;j<i;j++)
{
Temp-=A[j]*B[i-j-1];
}

C[i]=Temp;
}

return Temp;
}


12 for(j=0;j<i;j++)
00f88e: B50900A6 RPTB #9, @AR6
14 Temp-=A[j]*B[i-j-1];
C$L2:
00f890: E2AF008F MOV32 R0H, *--XAR7, UNCF
00f892: E2AF0180 MOV32 R1H, *XAR0++, UNCF
00f894: E741360A MPYF32 R2H, R1H, R0H
|| ADDF32 R3H, R3H, R2H // must be SUBF32 R3H,R3H,R2H
00f896: 7700 NOP
00f897: 7700 NOP
00f898: 7700 NOP
C$L3:
00f899: E720009B SUBF32 R3H, R3H, R2H

Когда уже многоуважаемый TI наконец-то соизволит и исправит свой компилятор?

When it respected TI has finally deigns and fix your compiler?

I cannot reproduce this output. Please tell me your exact command-line arguments to cl2000. You can see them in the build console when CCS runs the compiler.

**** Build of configuration Debug for project TestCpU ****

"c:\\ti\\ccsv6\\utils\\bin\\gmake" -k all

'Building file: ../main.c'

'Invoking: C2000 Compiler'

"c:/ti/ti-cgt-c2000_6.4.2/bin/cl2000" -v28 -ml -mt --cla_support=cla1 --float_support=fpu32 --tmu_support=tmu0 --vcu_support=vcu2 -O2 --opt_for_speed=5 --include_path="c:/ti/ti-cgt-c2000_6.4.2/include" -g --diag_warning=225 --display_error_number --diag_wrap=off --preproc_with_compile --preproc_dependency="main.pp" "../main.c"

"../main.c", line 33: warning #225-D: function "printf" declared implicitly

'Finished building: ../main.c'

' '

'Building target: TestCpU.out'

'Invoking: C2000 Linker'

"c:/ti/ti-cgt-c2000_6.4.2/bin/cl2000" -v28 -ml -mt --cla_support=cla1 --float_support=fpu32 --tmu_support=tmu0 --vcu_support=vcu2 -O2 --opt_for_speed=5 -g --diag_warning=225 --display_error_number --diag_wrap=off -z -m"TestCpU.map" --stack_size=0x200 --warn_sections -i"c:/ti/ti-cgt-c2000_6.4.2/lib" -i"c:/ti/ti-cgt-c2000_6.4.2/include" --reread_libs --display_error_number --diag_wrap=off --xml_link_info="TestCpU_linkInfo.xml" --rom_model -o "TestCpU.out" "./main.obj" "../2837xD_RAM_lnk_cpu1.cmd" -l"libc.a"

<Linking>

warning #10247-D: creating output section ".cio" without a SECTIONS specification

warning #10210-D: creating ".esysmem" section with default size of 0x400; use the -heap option to change the default size

'Finished building target: TestCpU.out'

' '

**** Build Finished ****

You are not using printf correctly.  Please see this wiki article for the details.  Next I'll highlight a few errors you made, and give you a pointer into that article which discusses that error.

Yura Secret said:

"../main.c", line 33: warning #225-D: function "printf" declared implicitly

You have to include <stdio.h>.  Please go here.

Yura Secret said:

warning #10247-D: creating output section ".cio" without a SECTIONS specification

You have to explicitly control where this section goes in memory.  Please go here.

Yura Secret said:

warning #10210-D: creating ".esysmem" section with default size of 0x400; use the -heap option to change the default size

You have to explicitly size this section, and control where it goes in memory.  Please see this.

Thanks and regards,

-George

Dear George Moskov.
I have no problem to use "printf" and "heap memory".
I have a problem in the code generation under cyclic call "Temp- = A [j] * B [ij-1];" using optimization level 2 and level 3.

C2000 Compiler->Optimization->Optimization level-> 2 Global Optimizations (and above)

Instead "Temp- = A [j] * B [ij-1];" getting "Temp+ = A [j] * B [ij-1];"

Thank you for reporting the compiler options. I am able to reproduce the problem, and have submitted SDSCM00051506 to track this issue.