1; RUN: llc -mtriple=thumb-eabi -mcpu=arm1156t2-s -mattr=+thumb2 %s -o - | FileCheck %s 2 3define i64 @f1(i64 %a, i64 %b) { 4; CHECK: f1 5; CHECK: subs r0, r0, r2 6 %tmp = sub i64 %a, %b 7 ret i64 %tmp 8} 9 10; 734439407618 = 0x000000ab00000002 11define i64 @f2(i64 %a) { 12; CHECK: f2 13; CHECK: subs r0, #2 14; CHECK: sbc r1, r1, #171 15 %tmp = sub i64 %a, 734439407618 16 ret i64 %tmp 17} 18 19; 5066626890203138 = 0x0012001200000002 20define i64 @f3(i64 %a) { 21; CHECK: f3 22; CHECK: subs r0, #2 23; CHECK: sbc r1, r1, #1179666 24 %tmp = sub i64 %a, 5066626890203138 25 ret i64 %tmp 26} 27 28; 3747052064576897026 = 0x3400340000000002 29define i64 @f4(i64 %a) { 30; CHECK: f4 31; CHECK: subs r0, #2 32; CHECK: sbc r1, r1, #872428544 33 %tmp = sub i64 %a, 3747052064576897026 34 ret i64 %tmp 35} 36 37; 6221254862626095106 = 0x5656565600000002 38define i64 @f5(i64 %a) { 39; CHECK: f5 40; CHECK: subs r0, #2 41; CHECK: adc r1, r1, #-1448498775 42 %tmp = sub i64 %a, 6221254862626095106 43 ret i64 %tmp 44} 45 46; 287104476244869122 = 0x03fc000000000002 47define i64 @f6(i64 %a) { 48; CHECK: f6 49; CHECK: subs r0, #2 50; CHECK: sbc r1, r1, #66846720 51 %tmp = sub i64 %a, 287104476244869122 52 ret i64 %tmp 53} 54 55; Example from numerics code that manually computes wider-than-64 values. 56; 57; CHECK-LABEL: livecarry: 58; CHECK: adds 59; CHECK: adc 60define i64 @livecarry(i64 %carry, i32 %digit) nounwind { 61 %ch = lshr i64 %carry, 32 62 %cl = and i64 %carry, 4294967295 63 %truncdigit = zext i32 %digit to i64 64 %prod = add i64 %cl, %truncdigit 65 %ph = lshr i64 %prod, 32 66 %carryresult = add i64 %ch, %ph 67 ret i64 %carryresult 68} 69