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About vb99

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  1. Yes, the result is fine (if I remember rightly), but the data in bank 0 gets corrupted because when __mul_32u__0000F_1_i is cleared, it is in the wrong bank (it should be in bank 1). The assembly looks like this: __mul_32u__0000F_arg_a EQU 0x0000007C ; bytes:4 __mul_32u__0000F_arg_b EQU 0x000000A0 ; bytes:4 __mul_32u__0000F_1_i EQU 0x000000A4 ; bytes:1 test_00000 ; { test ; function begin MOVF test_00000_arg_multiplicand, W BSF STATUS, RP0 ;bank 1 MOVWF __mul_32u__0000F_arg_b CLRF __mul_32u__0000F_arg_b+D'1' CLRF __mul_32u__0000F_arg_b+D'2' CLRF __mul_32u__0000F_arg_b+D'3' MOVLW 0xD0 BCF STATUS, RP0 ;bank 0 MOVWF __mul_32u__0000F_arg_a MOVLW 0x07 MOVWF __mul_32u__0000F_arg_a+D'1' CLRF __mul_32u__0000F_arg_a+D'2' CLRF __mul_32u__0000F_arg_a+D'3' ;still in bank 0 CALL __mul_32u__0000F ----snip---- __mul_32u__0000F ; { __mul_32u_32u ; function begin ; still in bank 0, and yet __mul_32u__0000F_1_i is in bank 1...whatever is in bank 0 at this location gets overwritten. CLRF __mul_32u__0000F_1_i BCF STATUS, RP0 CLRF CompTempVarRet0 CLRF CompTempVarRet0+D'1' CLRF CompTempVarRet0+D'2' CLRF CompTempVarRet0+D'3'
  2. Bug description: Incorrect bank used in unsigned long multiplication under certain circumstances. Steps to reproduce: This has been seen when __mul_32u__0000F_arg_a is in bank 0, and __mul_32u__0000F_arg_b and __mul_32u__0000F_1_i are in bank 1. In the compiled code, in the calling function, bank 1 is selected, __mul_32u__0000F_arg_b is set up, bank 0 is selected, __mul_32u__0000F_arg_a is set up, and __mul_32u__0000F is called while still in bank 0. __mul_32u__0000F assumes that it is already in bank 1 on calling, clears __mul_32u__0000F_1_i, then clears RP0 (although it is already cleared). The problem only occurs if the first argument is a constant. Example code: #include <system.h> //dummy global char dummy[ 83 ]; unsigned char test( unsigned char multiplier ) { unsigned long result; //problem only appears when first arg is constant result = 2000 * (unsigned long)multiplier; return (unsigned char)result; } void main() { dummy[0] = 1; test( 200 ); dummy[0] = 2; while(1); } Expected behaviour: Bank 1 should be selected before clearing __mul_32u__0000F_1_i, or before entering __mul_32u__0000F. Is the problem 100% reproduceable: Yes. IDE version: 6.20 Compiler: BoostC Compiler version: 6.21 Target device: PIC16F876 OS: Win2K
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