| Severity: |
critical
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CC: |
adruab, Andreas.Glowatz, andreg, bobm75, boris, c.pop, cdfrey, charles, christophe.guillon, cxl, czang, d.bonekaemper, danfuzz, davids, davmac, devin, djk, dmeggy, duraid, evgeny, ezharkov, fabdouze, fm, gcc-bugs, gcc, ghouston, gino, gopalv82, grigory_zagorodnev, hayim, horst.lehser, hurbain, ja2morri, jason.elbaum, jfran, jochang, kalas, larschri, lindsayd, linuxadmin, lucho, l_heldt, mike, mor_gopal, noaml, pgonzalez, pierre.chatelier, pjh, puvar, rarob, renzo, rick.ju, spelis, steffen.zimmermann, steger, strasbur, sumii, thomas.anders, zengpan, zybi
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Expected output on little-endian machines: DEF05678 Real output with optimization -O2 (where ???? -- is trash): DEF0???? Compilation command: g++ -O2 t.c Program text: #include <stdio.h> typedef unsigned char uint08_t; typedef unsigned short int uint16_t; typedef unsigned int uint32_t; typedef unsigned long uint64_t; int main() { uint64_t val = uint64_t(0x123456789ABCDEF0); uint08_t h[6]; *(uint16_t*)h = (val >> 32) & 0xffff; *(uint32_t*)(h + 2) = val & 0xffffffff; uint32_t res = *((uint32_t *)h); printf ("%08X\n", res); return 0; }