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| 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 | 152e7c8b1222d2af61df72c08caaa740e553cb6c (patch) | |
| tree | 7178c1d1db0b5bf2babca7793c71c079854e1156 /llvm/test/CodeGen/SPARC | |
| parent | 07985809abeb97c131d37ee389ee0fea2a646516 (diff) | |
| download | bcm5719-llvm-152e7c8b1222d2af61df72c08caaa740e553cb6c.tar.gz bcm5719-llvm-152e7c8b1222d2af61df72c08caaa740e553cb6c.zip | |
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).
llvm-svn: 274952
Diffstat (limited to 'llvm/test/CodeGen/SPARC')
| -rw-r--r-- | llvm/test/CodeGen/SPARC/32abi.ll | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/SPARC/32abi.ll b/llvm/test/CodeGen/SPARC/32abi.ll index ccea1adceaf..09e7a3a09d8 100644 --- a/llvm/test/CodeGen/SPARC/32abi.ll +++ b/llvm/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 |
