1 ; RUN: llc -o - %s | FileCheck %s 2 target triple = "arm-unknown-unknown" 3 4 ; select with and i1/or i1 condition should be implemented as a series of 2 5 ; cmovs, not by producing two conditions and using and on them. 6 7 define i32 @select_and(i32 %a0, i32 %a1, i32 %a2, i32 %a3, i32 %a4, i32 %a5) { 8 ; CHECK-LABEL: select_and 9 ; CHECK-NOT: tst 10 ; CHECK-NOT: movne 11 ; CHECK: mov{{lo|hs}} 12 ; CHECK: mov{{lo|hs}} 13 %cmp0 = icmp ult i32 %a0, %a1 14 %cmp1 = icmp ult i32 %a2, %a3 15 %and = and i1 %cmp0, %cmp1 16 %res = select i1 %and, i32 %a4, i32 %a5 17 ret i32 %res 18 } 19 20 define i32 @select_or(i32 %a0, i32 %a1, i32 %a2, i32 %a3, i32 %a4, i32 %a5) { 21 ; select with and i1 condition should be implemented as a series of 2 cmovs, not 22 ; by producing two conditions and using and on them. 23 ; CHECK-LABEL: select_or 24 ; CHECK-NOT: orss 25 ; CHECK-NOT: tst 26 ; CHECK: mov{{lo|hs}} 27 ; CHECK: mov{{lo|hs}} 28 %cmp0 = icmp ult i32 %a0, %a1 29 %cmp1 = icmp ult i32 %a2, %a3 30 %and = or i1 %cmp0, %cmp1 31 %res = select i1 %and, i32 %a4, i32 %a5 32 ret i32 %res 33 } 34 35 ; If one of the conditions is materialized as a 0/1 value anyway, then the 36 ; sequence of 2 cmovs should not be used. 37 38 @var32 = global i32 0 39 define i32 @select_noopt(i32 %a0, i32 %a1, i32 %a2, i32 %a3, i32 %a4) { 40 ; CHECK-LABEL: select_noopt 41 ; CHECK: orrs 42 ; CHECK: movne 43 %cmp0 = icmp ult i32 %a0, %a1 44 %cmp1 = icmp ult i32 %a1, %a2 45 %or = or i1 %cmp0, %cmp1 46 %zero_one = zext i1 %or to i32 47 store volatile i32 %zero_one, i32* @var32 48 %res = select i1 %or, i32 %a3, i32 %a4 49 ret i32 %res 50 } 51
