[PATCH] D67088: [PowerPC] extend PPCPreIncPrep Pass for ds/dq form
ChenZheng via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Sep 2 21:52:40 PDT 2019
shchenz created this revision.
shchenz added a reviewer: hfinkel.
Herald added subscribers: llvm-commits, wuzish, jfb, MaskRay, kbarton, hiraditya, mgorny, nemanjai.
Herald added a project: LLVM.
Now, PPCPreIncPrep pass changes a loop to update form and update all load/store with same base accordingly.
We can do more for load/store with same base, for example, convert load/store with same base to ds/dq form. Like:
Generically, this means transforming loops like this:
for (int i = 0; i < n; ++i) {
unsigned long x1 = *(unsigned long *)(p + i + 5);
unsigned long x2 = *(unsigned long *)(p + i + 9);
}
to look like this:
unsigned NewP = p + 5;
for (int i = 0; i < n; ++i) {
unsigned long x1 = *(unsigned long *)(i + NewP);
unsigned long x2 = *(unsigned long *)(i + NewP + 4);
}
I temporaryly only add @hfinkel as a solution reviewer to ensure it is the right place to implement such transform.
https://reviews.llvm.org/D67088
Files:
llvm/lib/Target/PowerPC/CMakeLists.txt
llvm/lib/Target/PowerPC/PPC.h
llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp
llvm/lib/Target/PowerPC/PPCLoopPreIncPrep.cpp
llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
llvm/lib/Target/PowerPC/PPCTargetMachine.cpp.rej
llvm/test/CodeGen/PowerPC/loop-instr-form-prepare.ll
llvm/test/CodeGen/PowerPC/ppc-passname.ll
llvm/test/CodeGen/PowerPC/swaps-le-1.ll
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