1 ; RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs < %s | FileCheck %s 2 3 ; LLVM should be able to cope with multiple uses of the same flag-setting 4 ; instruction at different points of a routine. Either by rematerializing the 5 ; compare or by saving and restoring the flag register. 6 7 declare void @bar() 8 9 @var = global i32 0 10 11 define i32 @test_multiflag(i32 %n, i32 %m, i32 %o) { 12 ; CHECK-LABEL: test_multiflag: 13 14 %test = icmp ne i32 %n, %m 15 ; CHECK: cmp [[LHS:w[0-9]+]], [[RHS:w[0-9]+]] 16 17 %val = zext i1 %test to i32 18 ; CHECK: csinc {{[xw][0-9]+}}, {{xzr|wzr}}, {{xzr|wzr}}, eq 19 20 store i32 %val, i32* @var 21 22 call void @bar() 23 ; CHECK: bl bar 24 25 ; Currently, the comparison is emitted again. An MSR/MRS pair would also be 26 ; acceptable, but assuming the call preserves NZCV is not. 27 br i1 %test, label %iftrue, label %iffalse 28 ; CHECK: cmp [[LHS]], [[RHS]] 29 ; CHECK: b.eq 30 31 iftrue: 32 ret i32 42 33 iffalse: 34 ret i32 0 35 } 36
