| Summary: | Optimizer bug in egcs-2.91.66 | ||||||
|---|---|---|---|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Willi N|_er <wilhelm.nuesser> | ||||
| Component: | egcs | Assignee: | Cristian Gafton <gafton> | ||||
| Status: | CLOSED RAWHIDE | QA Contact: | |||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | high | ||||||
| Version: | 6.0 | ||||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | i386 | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2000-02-05 18:57:47 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Attachments: |
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I have sent a fix for this to the GCC gurus at: http://egcs.cygnus.com/ml/gcc-patches/1999-09/msg01103.html We will see what they say. The update is at: http://egcs.cygnus.com/ml/gcc-patches/1999-09/msg01170.html That patch may be a good choice. See: http://egcs.cygnus.com/ml/gcc-patches/1999-09/msg01240.html Created attachment 37 [details]
Slightly more elaborate strict_low_part patch
Fixed in the egcs currently in Raw Hide. |
Hi, when compiling the appended C-code first with gcc -v -save-temps bug.c and then with gcc -v -save-temps -O bug.c you will see garbage at the end of the output of the optimized case. Best regards Willi N|_er, LinuxLab SAP AG ********************************************* ****** bug.c ******************************** ********************************************* #include <stdio.h> #include <stdlib.h> /*#define TRAILER 0x07*/ #define TRAILER 'A' static char buf[40]; static char line[30] = "1234567890123456789012345678*"; static void f() { char trailer[2] = { TRAILER, 0x00 }; char* const last = buf + sizeof(line) - 2; memcpy(buf, line, sizeof(line)); if (*last == '*') { memcpy(last, trailer, 2); } } int main() { f(); printf("%s\n", buf); return 0; } ************************************************** ****** end of bug.c ****************************** **************************************************