diff options
| author | Matthias Braun <matze@braunis.de> | 2016-07-09 00:19:07 +0000 |
|---|---|---|
| committer | Matthias Braun <matze@braunis.de> | 2016-07-09 00:19:07 +0000 |
| commit | 79519fecc311f2ced5d204a9f7de296aaa246e9b (patch) | |
| tree | 699d58c054c190a039f4324211751c553bb0f1ce /test/CodeGen/SPARC | |
| parent | 93ad397da1c0d0df4e3a070de495801195b8efc9 (diff) | |
VirtRegMap: Replace some identity copies with KILL instructions.
An identity COPY like this:
%AL = COPY %AL, %EAX<imp-def>
has no semantic effect, but encodes liveness information: Further users
of %EAX only depend on this instruction even though it does not define
the full register.
Replace the COPY with a KILL instruction in those cases to maintain this
liveness information. (This reverts a small part of r238588 but this
time adds a comment explaining why a KILL instruction is useful).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274952 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/SPARC')
| -rw-r--r-- | test/CodeGen/SPARC/32abi.ll | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/test/CodeGen/SPARC/32abi.ll b/test/CodeGen/SPARC/32abi.ll index ccea1adceaf..09e7a3a09d8 100644 --- a/test/CodeGen/SPARC/32abi.ll +++ b/test/CodeGen/SPARC/32abi.ll @@ -60,9 +60,11 @@ define void @call_intarg(i32 %i0, i8* %i1) { ; HARD: mov %i5, %g2 ; HARD-NEXT: ld [%fp+92], %g3 ; HARD-NEXT: mov %i4, %i5 +; HARD-NEXT: ! kill ; HARD-NEXT: std %g2, [%fp+-24] ; HARD-NEXT: mov %i3, %i4 ; HARD-NEXT: std %i4, [%fp+-16] +; HARD-NEXT: ! kill ; HARD-NEXT: std %i0, [%fp+-8] ; HARD-NEXT: st %i2, [%fp+-28] ; HARD-NEXT: ld [%fp+104], %f0 |