llvm/2012-07-16-LeaUndef.ll at 51aaadb7bda93040ebfc8341abed7627c99be8f7 - llvm - Gitea: Git with a cup of tea

RPCS3/llvm

mirror of https://github.com/RPCS3/llvm.git synced 2024-11-25 04:39:51 +00:00

Nadav Rotem d93ea88cde Fix a bug in the 3-address conversion of LEA when one of the operands is an

undef virtual register. The problem is that ProcessImplicitDefs removes the
definition of the register and marks all uses as undef. If we lose the undef
marker then we get a register which has no def, is not marked as undef. The
live interval analysis does not collect information for these virtual
registers and we crash in later passes.

Together with Michael Kuperstein <michael.m.kuperstein@intel.com>



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160260 91177308-0d34-0410-b5e6-96231b3b80d8

2012-07-16 10:52:25 +00:00

17 lines

347 B

LLVM

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 ; RUN: llc < %s -march=x86-64 -mcpu=corei7
 define void @autogen_SD2543() {
 A:
   %E83 = add i32 0, 1
   %E820 = add i32 0, undef
   br label %C
 C:
   %B908 = add i32 %E83, %E820
   store i32 %B908, i32* undef
   %Sl2391 = select i1 undef, i32 undef, i32 %E83
   %Cmp3114 = icmp ne i32 %Sl2391, undef
   br i1 %Cmp3114, label %C, label %G
 G:
   ret void
 }