36 lines
937 B
LLVM
36 lines
937 B
LLVM
; 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:
|
|
|
|
%test = icmp ne i32 %n, %m
|
|
; CHECK: cmp [[LHS:w[0-9]+]], [[RHS:w[0-9]+]]
|
|
|
|
%val = zext i1 %test to i32
|
|
; CHECK: cset {{[xw][0-9]+}}, ne
|
|
|
|
store i32 %val, i32* @var
|
|
|
|
call void @bar()
|
|
; CHECK: bl 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
|
|
; CHECK: cmp [[LHS]], [[RHS]]
|
|
; CHECK: b.eq
|
|
|
|
iftrue:
|
|
ret i32 42
|
|
iffalse:
|
|
ret i32 0
|
|
}
|