File: ldst-opt-zr-clobber.mir

package info (click to toggle)
llvm-toolchain-20 1%3A20.1.8-1~exp1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 2,111,388 kB
  • sloc: cpp: 7,438,767; ansic: 1,393,871; asm: 1,012,926; python: 241,728; f90: 86,635; objc: 75,411; lisp: 42,144; pascal: 17,286; sh: 10,027; ml: 5,082; perl: 4,730; awk: 3,523; makefile: 3,349; javascript: 2,251; xml: 892; fortran: 672
file content (27 lines) | stat: -rw-r--r-- 832 bytes parent folder | download | duplicates (9) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
 

# RUN: llc -mtriple=aarch64-none-linux-gnu -run-pass aarch64-ldst-opt  -verify-machineinstrs  -o - %s | FileCheck %s

--- |
  define i1 @no-clobber-zr(ptr %p, i64 %x) { ret i1 0 }
...
---
# Check that write of xzr doesn't inhibit pairing of xzr stores since
# it isn't actually clobbered.  Written as a MIR test to avoid
# schedulers reordering instructions such that SUBS doesn't appear
# between stores.
# CHECK-LABEL: name: no-clobber-zr
# CHECK: STPXi $xzr, $xzr, $x0, 0
name: no-clobber-zr
body: |
  bb.0:
    liveins: $x0,  $x1
    STRXui $xzr, $x0, 0 :: (store (s64) into %ir.p)
    dead $xzr = SUBSXri killed $x1, 0, 0, implicit-def $nzcv
    $w8 = CSINCWr $wzr, $wzr, 1, implicit killed $nzcv
    STRXui $xzr, killed $x0, 1 :: (store (s64) into %ir.p)
    $w0 = ORRWrs $wzr, killed $w8, 0
    RET $lr, implicit $w0
...