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1 2# RUN: llc -mtriple=aarch64-none-linux-gnu -run-pass aarch64-ldst-opt -verify-machineinstrs -o - %s | FileCheck %s3 4--- |5 define i1 @no-clobber-zr(ptr %p, i64 %x) { ret i1 0 }6...7---8# Check that write of xzr doesn't inhibit pairing of xzr stores since9# it isn't actually clobbered. Written as a MIR test to avoid10# schedulers reordering instructions such that SUBS doesn't appear11# between stores.12# CHECK-LABEL: name: no-clobber-zr13# CHECK: STPXi $xzr, $xzr, $x0, 014name: no-clobber-zr15body: |16 bb.0:17 liveins: $x0, $x118 STRXui $xzr, $x0, 0 :: (store (s64) into %ir.p)19 dead $xzr = SUBSXri killed $x1, 0, 0, implicit-def $nzcv20 $w8 = CSINCWr $wzr, $wzr, 1, implicit killed $nzcv21 STRXui $xzr, killed $x0, 1 :: (store (s64) into %ir.p)22 $w0 = ORRWrs $wzr, killed $w8, 023 RET $lr, implicit $w024...25 26 27 28