[llvm-bugs] [Bug 32681] New: r300404 breaks building seabios
via llvm-bugs
llvm-bugs at lists.llvm.org
Sun Apr 16 12:47:22 PDT 2017
https://bugs.llvm.org/show_bug.cgi?id=32681
Bug ID: 32681
Summary: r300404 breaks building seabios
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedbugs at nondot.org
Reporter: benny.kra at gmail.com
CC: chandlerc at gmail.com, dimitry at andric.com,
djasper at google.com, llvm-bugs at lists.llvm.org
Reduced test case:
$ cat t.c
unsigned long long rdmsr(unsigned index) {
unsigned long long ret;
asm("rdmsr" : "=A"(ret) : "c"(index));
return ret;
}
$ clang t.c -m16
fatal error: error in backend: Cannot select: t19: i32 = build_pair t17, t18
t17: i16,ch,glue = CopyFromReg t16, Register:i16 %AX, t16:1
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