[LLVMbugs] [Bug 14787] New: inline asm triggers "Instruction uses an allocated register" in fast register allocator

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14787

             Bug #: 14787
           Summary: inline asm triggers "Instruction uses an allocated
                    register" in fast register allocator
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: hfinkel at anl.gov
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 9799
  --> http://llvm.org/bugs/attachment.cgi?id=9799
bugpoint reduced test case

This code, which compiles without issue using the regular register allocator,
asserts with the fast register allocator.

define void @Kernel_GetAXUCR0() nounwind inlinehint alwaysinline {
entry:
  %0 = call { i64, i64 } asm sideeffect "sc",
"={r0},={r3},{r0},~{r4},~{r5},~{r6},~{r7},~{r8},~{r9},~{r10},~{r11},~{r12},~{cr0},~{memory}"(i64
undef) nounwind, !srcloc !0
  ret void
}


Instruction uses an allocated register
UNREACHABLE executed at
/src/llvm-trunk-writable/lib/CodeGen/RegAllocFast.cpp:351!

Test case attached.

-- 
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.