llvm /
llvm /
1f3d0040fc8ed27a8adb7a2466864b1fa0b80889 AMDGPU: Fix infinite searches in SIFixSGPRCopies
Summary:
Two conditions could lead to infinite loops when processing PHI nodes in
SIFixSGPRCopies.
The first condition involves a REG_SEQUENCE that uses registers defined by both
a PHI and a COPY.
The second condition arises when a physical register is copied to a virtual
register which is then used in a PHI node. If the same virtual register is
copied to the same physical register, the result is an endless loop.
%0:sgpr_64 = COPY $sgpr0_sgpr1
%2 = PHI %0, %bb.0, %1, %bb.1
$sgpr0_sgpr1 = COPY %0
Reviewers: alex-t, rampitec, arsenm
Reviewed By: rampitec
Subscribers: kzhuravl, jvesely, wdng, nhaehnle, yaxunl, dstuttard, tpr, t-tye, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D68970
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374944 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed
