// heuristics decide.
unsigned MaxLen = EnableOpt ? 0 : 32;
// Try to inline memcpy type calls if optimizations are enabled.
- if (!EnableMinSize && Helper.tryCombineMemCpyFamily(MI, MaxLen))
+ if (Helper.tryCombineMemCpyFamily(MI, MaxLen))
return true;
if (Opc == TargetOpcode::G_MEMSET)
return llvm::AArch64GISelUtils::tryEmitBZero(MI, B, EnableMinSize);
ret void
}
+ define void @minsize(i8* nocapture %dst) minsize { unreachable }
+
declare void @llvm.stackprotector(i8*, i8**) #2
attributes #0 = { nounwind ssp uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "frame-pointer"="all" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="cyclone" "target-features"="+aes,+crypto,+fp-armv8,+neon,+sha2,+zcm,+zcz" "unsafe-fp-math"="false" "use-soft-float"="false" }
RET_ReallyLR
...
+---
+name: minsize
+alignment: 4
+tracksRegLiveness: true
+body: |
+ bb.0:
+ liveins: $w1, $x0
+ ; CHECK-LABEL: name: minsize
+ ; CHECK: liveins: $w1, $x0
+ ; CHECK: [[COPY:%[0-9]+]]:_(p0) = COPY $x0
+ ; CHECK: [[COPY1:%[0-9]+]]:_(s32) = COPY $w1
+ ; CHECK: [[TRUNC:%[0-9]+]]:_(s8) = G_TRUNC [[COPY1]](s32)
+ ; CHECK: [[ZEXT:%[0-9]+]]:_(s64) = G_ZEXT [[TRUNC]](s8)
+ ; CHECK: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 72340172838076673
+ ; CHECK: [[MUL:%[0-9]+]]:_(s64) = G_MUL [[ZEXT]], [[C]]
+ ; CHECK: G_STORE [[MUL]](s64), [[COPY]](p0) :: (store 8 into %ir.dst, align 1)
+ ; CHECK: [[C1:%[0-9]+]]:_(s64) = G_CONSTANT i64 8
+ ; CHECK: [[PTR_ADD:%[0-9]+]]:_(p0) = G_PTR_ADD [[COPY]], [[C1]](s64)
+ ; CHECK: G_STORE [[MUL]](s64), [[PTR_ADD]](p0) :: (store 8 into %ir.dst + 8, align 1)
+ ; CHECK: RET_ReallyLR
+ %0:_(p0) = COPY $x0
+ %1:_(s32) = COPY $w1
+ %3:_(s64) = G_CONSTANT i64 16
+ %2:_(s8) = G_TRUNC %1(s32)
+ G_MEMSET %0(p0), %2(s8), %3(s64), 1 :: (store 1 into %ir.dst)
+ RET_ReallyLR