59 lines
1.8 KiB
LLVM
59 lines
1.8 KiB
LLVM
|
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
|
||
|
; RUN: llc -mtriple=aarch64-none-linux-gnu -aarch64-enable-atomic-cfg-tidy=0 -verify-machineinstrs -o - %s | FileCheck %s
|
||
|
|
||
|
; LLVM should be able to cope with multiple uses of the same flag-setting
|
||
|
; instruction at different points of a routine. Either by rematerializing the
|
||
|
; compare or by saving and restoring the flag register.
|
||
|
|
||
|
declare void @bar()
|
||
|
|
||
|
@var = global i32 0
|
||
|
|
||
|
define i32 @test_multiflag(i32 %n, i32 %m, i32 %o) {
|
||
|
; CHECK-LABEL: test_multiflag:
|
||
|
; CHECK: // %bb.0:
|
||
|
; CHECK-NEXT: str x30, [sp, #-32]! // 8-byte Folded Spill
|
||
|
; CHECK-NEXT: stp x20, x19, [sp, #16] // 16-byte Folded Spill
|
||
|
; CHECK-NEXT: .cfi_def_cfa_offset 32
|
||
|
; CHECK-NEXT: .cfi_offset w19, -8
|
||
|
; CHECK-NEXT: .cfi_offset w20, -16
|
||
|
; CHECK-NEXT: .cfi_offset w30, -32
|
||
|
; CHECK-NEXT: adrp x8, :got:var
|
||
|
; CHECK-NEXT: cmp w0, w1
|
||
|
; CHECK-NEXT: mov w19, w1
|
||
|
; CHECK-NEXT: ldr x8, [x8, :got_lo12:var]
|
||
|
; CHECK-NEXT: cset w9, ne
|
||
|
; CHECK-NEXT: mov w20, w0
|
||
|
; CHECK-NEXT: str w9, [x8]
|
||
|
; CHECK-NEXT: bl bar
|
||
|
; CHECK-NEXT: cmp w20, w19
|
||
|
; CHECK-NEXT: b.eq .LBB0_2
|
||
|
; CHECK-NEXT: // %bb.1: // %iftrue
|
||
|
; CHECK-NEXT: mov w0, #42 // =0x2a
|
||
|
; CHECK-NEXT: b .LBB0_3
|
||
|
; CHECK-NEXT: .LBB0_2: // %iffalse
|
||
|
; CHECK-NEXT: mov w0, wzr
|
||
|
; CHECK-NEXT: .LBB0_3: // %iftrue
|
||
|
; CHECK-NEXT: ldp x20, x19, [sp, #16] // 16-byte Folded Reload
|
||
|
; CHECK-NEXT: ldr x30, [sp], #32 // 8-byte Folded Reload
|
||
|
; CHECK-NEXT: ret
|
||
|
|
||
|
%test = icmp ne i32 %n, %m
|
||
|
|
||
|
%val = zext i1 %test to i32
|
||
|
|
||
|
|
||
|
store i32 %val, ptr @var
|
||
|
|
||
|
call void @bar()
|
||
|
|
||
|
; Currently, the comparison is emitted again. An MSR/MRS pair would also be
|
||
|
; acceptable, but assuming the call preserves NZCV is not.
|
||
|
br i1 %test, label %iftrue, label %iffalse
|
||
|
|
||
|
iftrue:
|
||
|
ret i32 42
|
||
|
iffalse:
|
||
|
ret i32 0
|
||
|
}
|