https://bugs.kde.org/show_bug.cgi?id=498492
Bug ID: 498492
Summary: none/tests/amd64/lzcnt64 crashes on FreeBSD compiled
with clang
Classification: Developer tools
Product: valgrind
Version: unspecified
Platform: FreeBSD Ports
OS: FreeBSD
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: pjfl...@wanadoo.fr
Target Milestone: ---
8 void do_lzcnt64 ( /*OUT*/UInt* flags, /*OUT*/ULong* res, ULong arg )
9 {
10 ULong block[3] = { arg, 0ULL, 0ULL };
11 __asm__ __volatile__(
12 "movabsq $0x5555555555555555, %%r11" "\n\t"
13 "lzcntq 0(%0), %%r11" "\n\t"
14 "movq %%r11, 8(%0)" "\n\t"
15 "pushfq" "\n\t"
16 "popq %%r11" "\n\t"
17 "movq %%r11, 16(%0)" "\n"
18 : : "r"(&block[0]) : "r11","cc","memory"
19 );
20 *res = block[1];
21 *flags = block[2] & 0x8d5;
22 }
The 'pushfq' on line 15 corrupts the flags pointer causing a segfault.
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