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Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan RenesasTechnology Corp. Product Category
User Development Environment
Document
Information Category
TN-CSX-069A/EA
Rev.
Title
SuperH RISC engine C/C++ Compiler Ver.8 information
Usage Limitation
Applicable Product
P0700CAS8-MWR P0700CAS8-SLR P0700CAS8-H7R R0C40700XSW08R R0C40700XSS08R R0C40700XSH08R
Ver.8.0
Reference Document
SuperH RISC engine C/C++ Compiler Assembler Optimizing Linkage Editor User's Manual REJ10B0047-0100H Rev.1.00
Attached description detected information Ver. series SuperH RISC engine C/C++ Compiler. will affect this package version.
Attached: P0700CAS8-040518E SuperH RISC engine C/C++ Compiler Ver. details detected information
2004. Renesas Technology Corp., rights reserved.
Page
P0700CAS8-040518E
SuperH RISC engine C/C++ Compiler Ver.8 details detected information
bugs detected ver. SuperH RISC engine C/C++ Compiler shown below. Illegal Copy Propagation [Description] When copy instruction existed block with multiple branch sources, copy instruction might illegally eliminated. [Example]
func(int ret=0; while(*x++){ if(*x==1){ ret+=2; return (ret+2); _func: L11: MOV.L Illegally eliminated copy instruction converted
#0,R5 @R4,R2 #4,R4
Illegally eliminateillegaso T/nly TcTD 0.17 (uction convert) Tj6w
P0700CAS8-040518E
P0700CAS8-040518E
Illegal Access with Parameter Passed Stack [Description] function with parameter passed stack function call immediately before exit, address reference parameter passed stack .2ediately before 46.8 c24in8 i6Tc6
P0700CAS8-040518E
Incorrect Relative Logic Operation [Description] logic operation with 1-byte array bit-field member which #pragma gbr_base/gbr_base1 specified performed, result operation might written incorrect area. [Example]
#pragma gbr_base char a[2],b[2]; void a[0] b[0] AND.B #_b-(STARTOF $G0),R0 #1,@(R0,GBR) Wrote result operation b[0]
[Conditions] This problem might occur when following conditions were fulfilled. gbr=user option specified. #pragma gbr_base/gbr_base1 specified following variables: (unsigned) char-type array structure array that (unsigned) char-type member structure that (unsigned) char-type array member structure that bit-field member bits less logic operation constant with variable (b[0] above example) performed. variable assigned operation (a[0] above example) fulfilled condition (2). Variables were different variables, different elements same array, different members same structure. [Solution] This problem prevented following methods.
P0700CAS8-040518E
Illegal Elimination Sign/Zero Extension [Description] address variable/constant index array cast bytes this value used accessing memory, expression which cast char type assigned unsigned short type variable result used comparison, cast might illegally eliminated. [Example
unsigned short char a[1000]; void a[(char)x] MOV.L MOV.L MOV.W EXTU.B L11+2,R2 L11+6,R6 @R2,R5 R5,R0 #0,R5 _0te Eliminated EXTS.B R0,R0 was{

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