1; RUN: llc -o - %s | FileCheck %s 2target triple = "x86_64-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 7define i32 @select_and(i32 %a0, i32 %a1, float %a2, float %a3, i32 %a4, i32 %a5) { 8; CHECK-LABEL: select_and 9; CHECK-NOT: set 10; CHECK-NOT: and[lb] 11; CHECK-NOT: test 12; CHECK: cmov 13; CHECK: cmov 14 %cmp0 = icmp ult i32 %a0, %a1 15 %cmp1 = fcmp olt float %a2, %a3 16 %and = and i1 %cmp0, %cmp1 17 %res = select i1 %and, i32 %a4, i32 %a5 18 ret i32 %res 19} 20 21define i32 @select_or(i32 %a0, i32 %a1, float %a2, float %a3, i32 %a4, i32 %a5) { 22; select with and i1 condition should be implemented as a series of 2 cmovs, not 23; by producing two conditions and using and on them. 24; CHECK-LABEL: select_or 25; CHECK-NOT: set 26; CHECK-NOT: or[lb] 27; CHECK-NOT: test 28; CHECK: cmov 29; CHECK: cmov 30 %cmp0 = icmp ult i32 %a0, %a1 31 %cmp1 = fcmp olt float %a2, %a3 32 %and = or i1 %cmp0, %cmp1 33 %res = select i1 %and, i32 %a4, i32 %a5 34 ret i32 %res 35} 36 37; If one of the conditions is materialized as a 0/1 value anyway, then the 38; sequence of 2 cmovs should not be used. 39 40@var32 = global i32 0 41define i32 @select_noopt(i32 %a0, i32 %a1, i32 %a2, i32 %a3, i32 %a4) { 42; CHECK-LABEL: select_noopt 43; CHECK: cmov 44; CHECK-NOT: cmov 45 %cmp0 = icmp ult i32 %a0, %a1 46 %cmp1 = icmp ult i32 %a1, %a2 47 %or = or i1 %cmp0, %cmp1 48 %zero_one = zext i1 %or to i32 49 store volatile i32 %zero_one, i32* @var32 50 %res = select i1 %or, i32 %a3, i32 %a4 51 ret i32 %res 52} 53