if (StoreSDNode *ST1 = dyn_cast<StoreSDNode>(Chain)) {
if (ST->isUnindexed() && !ST->isVolatile() && ST1->isUnindexed() &&
- !ST1->isVolatile() && ST1->getBasePtr() == Ptr &&
- ST->getMemoryVT() == ST1->getMemoryVT()) {
- // If this is a store followed by a store with the same value to the same
- // location, then the store is dead/noop.
- if (ST1->getValue() == Value) {
- // The store is dead, remove it.
+ !ST1->isVolatile()) {
+ if (ST1->getBasePtr() == Ptr && ST1->getValue() == Value &&
+ ST->getMemoryVT() == ST1->getMemoryVT()) {
+ // If this is a store followed by a store with the same value to the
+ // same location, then the store is dead/noop.
return Chain;
}
- // If this is a store who's preceeding store to the same location
- // and no one other node is chained to that store we can effectively
- // drop the store. Do not remove stores to undef as they may be used as
- // data sinks.
if (OptLevel != CodeGenOpt::None && ST1->hasOneUse() &&
!ST1->getBasePtr().isUndef()) {
- // ST1 is fully overwritten and can be elided. Combine with it's chain
- // value.
- CombineTo(ST1, ST1->getChain());
- return SDValue();
+ const BaseIndexOffset STBase = BaseIndexOffset::match(ST, DAG);
+ const BaseIndexOffset ChainBase = BaseIndexOffset::match(ST1, DAG);
+ unsigned STByteSize = ST->getMemoryVT().getSizeInBits() / 8;
+ unsigned ChainByteSize = ST1->getMemoryVT().getSizeInBits() / 8;
+ // If this is a store who's preceeding store to a subset of the current
+ // location and no one other node is chained to that store we can
+ // effectively drop the store. Do not remove stores to undef as they may
+ // be used as data sinks.
+ if (STBase.contains(STByteSize, ChainBase, ChainByteSize, DAG)) {
+ CombineTo(ST1, ST1->getChain());
+ return SDValue();
+ }
}
}
}
define i32 @main() local_unnamed_addr #1 {
; Make sure the stores happen in the correct order (the exact instructions could change).
; CHECK-LABEL: main:
-; CHECK: stp xzr, xzr, [sp, #72]
+
+; CHECK: str xzr, [sp, #80]
; CHECK: str w9, [sp, #80]
-; CHECK: str q0, [sp, #48]
+; CHECK: stp q0, q0, [sp, #48]
; CHECK: ldr w8, [sp, #48]
-; CHECK: str q0, [sp, #64]
for.body.lr.ph.i.i.i.i.i.i63:
%b1 = alloca [10 x i32], align 16
; CHECK-NEXT: .cfi_def_cfa_offset 48
; CHECK-NEXT: movq (%rdi), %rax
; CHECK-NEXT: xorps %xmm0, %xmm0
-; CHECK-NEXT: movaps %xmm0, (%rsp)
; CHECK-NEXT: movaps %xmm0, {{[0-9]+}}(%rsp)
; CHECK-NEXT: movq $0, {{[0-9]+}}(%rsp)
; CHECK-NEXT: movaps {{.*#+}} xmm0 = [12297829382473034410,12297829382473034410]