[AArch64] Enable merging of adjacent zero stores for all subtargets.
This optimization merges adjacent zero stores into a wider store.
e.g.,
strh wzr, [x0]
strh wzr, [x0, #2]
; becomes
str wzr, [x0]
e.g.,
str wzr, [x0]
str wzr, [x0, #4]
; becomes
str xzr, [x0]
Previously, this was only enabled for Kryo and Cortex-A57.
Differential Revision: https://reviews.llvm.org/D26396
llvm-svn: 286592
diff --git a/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp b/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
index 3fe589f..fc5ed6e 100644
--- a/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
+++ b/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
@@ -1699,8 +1699,7 @@
UsedRegs.resize(TRI->getNumRegs());
bool Modified = false;
- bool enableNarrowZeroStOpt =
- Subtarget->mergeNarrowStores() && !Subtarget->requiresStrictAlign();
+ bool enableNarrowZeroStOpt = !Subtarget->requiresStrictAlign();
for (auto &MBB : Fn)
Modified |= optimizeBlock(MBB, enableNarrowZeroStOpt);