1 ; RUN: llc -o - %s | FileCheck %s 2 target 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 7 define 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 21 define 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 41 define 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
