1 2 # RUN: llc -mtriple=aarch64-none-linux-gnu -run-pass aarch64-ldst-opt -verify-machineinstrs -o - %s | FileCheck %s 3 4 --- | 5 define i1 @no-clobber-zr(i64* %p, i64 %x) { ret i1 0 } 6 ... 7 --- 8 # Check that write of xzr doesn't inhibit pairing of xzr stores since 9 # it isn't actually clobbered. Written as a MIR test to avoid 10 # schedulers reordering instructions such that SUBS doesn't appear 11 # between stores. 12 # CHECK-LABEL: name: no-clobber-zr 13 # CHECK: STPXi $xzr, $xzr, $x0, 0 14 name: no-clobber-zr 15 body: | 16 bb.0: 17 liveins: $x0, $x1 18 STRXui $xzr, $x0, 0 :: (store 8 into %ir.p) 19 dead $xzr = SUBSXri killed $x1, 0, 0, implicit-def $nzcv 20 $w8 = CSINCWr $wzr, $wzr, 1, implicit killed $nzcv 21 STRXui $xzr, killed $x0, 1 :: (store 8 into %ir.p) 22 $w0 = ORRWrs $wzr, killed $w8, 0 23 RET $lr, implicit $w0 24 ... 25 26 27 28
