This allows the instruction selector to realize that it can directly
broadcast the low byte of the memset value, rather than replicating
it to a 64-bit GPR before broadcasting.
This fixes PR50985.
Differential Revision: https://reviews.llvm.org/D108354
};
if (CanUseNEON && Op.isMemset() && !IsSmallMemset &&
- AlignmentIsAcceptable(MVT::v2i64, Align(16)))
- return MVT::v2i64;
+ AlignmentIsAcceptable(MVT::v16i8, Align(16)))
+ return MVT::v16i8;
if (CanUseFP && !IsSmallMemset && AlignmentIsAcceptable(MVT::f128, Align(16)))
return MVT::f128;
if (Op.size() >= 8 && AlignmentIsAcceptable(MVT::i64, Align(8)))
--- /dev/null
+; RUN: llc < %s | FileCheck %s
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-unknown-linux-gnu"
+
+; CHECK: memset_call:
+; CHECK-NOT: and
+; CHECK: dup
+; CHECK-NEXT: stp
+; CHECK-NEXT: stp
+; CHECK-NEXT: ret
+define void @memset_call(i8* %0, i32 %1) {
+ %3 = trunc i32 %1 to i8
+ call void @llvm.memset.p0i8.i64(i8* %0, i8 %3, i64 64, i1 false)
+ ret void
+}
+
+declare void @llvm.memset.p0i8.i64(i8*, i8, i64, i1 immarg)
+