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From: "andrey.vihrov at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug inline-asm/101438] New: Compiler hang on inline asm with local register and VLA operands Date: Tue, 13 Jul 2021 14:36:05 +0000 [thread overview] Message-ID: <bug-101438-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101438 Bug ID: 101438 Summary: Compiler hang on inline asm with local register and VLA operands Product: gcc Version: 11.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: inline-asm Assignee: unassigned at gcc dot gnu.org Reporter: andrey.vihrov at gmail dot com Target Milestone: --- Target: x86_64-pc-linux-gnu Compiling this C source: int main(void) { register long long rax __asm__("rax") = 0; register long long rbx __asm__("rbx") = 0; register long long rcx __asm__("rcx") = 0; register long long rdx __asm__("rdx") = 0; register long long rsi __asm__("rsi") = 0; register long long rdi __asm__("rdi") = 0; register long long r8 __asm__("r8") = 0; register long long r9 __asm__("r9") = 0; register long long r10 __asm__("r10") = 0; register long long r11 __asm__("r11") = 0; register long long r12 __asm__("r12") = 0; register long long r13 __asm__("r13") = 0; register long long r14 __asm__("r14") = 0; register long long r15 __asm__("r15") = 0; volatile int x = 1; char arr[x]; __asm__ ("" : : "r"(rax), "r"(rbx), "r"(rcx), "r"(rdx), "r"(rsi), "r"(rdi), "r"(r8), "r"(r9), "r"(r10), "r"(r11), "r"(r12), "r"(r13), "r"(r14), "r"(r15), "m"(arr) ); } with "gcc -O1 test.c" causes the compiler to hang in an infinite loop. Note: This code could possibly be formally incorrect, as [1] warns about potential clobbering after initialization of local register variables. [1] https://gcc.gnu.org/onlinedocs/gcc/Local-Register-Variables.html
next reply other threads:[~2021-07-13 14:36 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-13 14:36 andrey.vihrov at gmail dot com [this message] 2021-07-14 6:07 ` [Bug inline-asm/101438] " rguenth at gcc dot gnu.org 2021-07-14 18:26 ` pinskia at gcc dot gnu.org 2021-07-14 19:11 ` andrey.vihrov at gmail dot com 2022-07-30 11:26 ` [Bug target/101438] Compiler hang on inline asm with local register and alloca andrey.vihrov at gmail dot com 2022-08-02 6:18 ` andrey.vihrov at gmail dot com
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