1 ; RUN: llc < %s -march=arm -mattr=+v4t | FileCheck %s 2 3 ;; Integer absolute value, should produce something as good as: ARM: 4 ;; movs r0, r0 5 ;; rsbmi r0, r0, #0 6 ;; bx lr 7 8 define i32 @test(i32 %a) { 9 %tmp1neg = sub i32 0, %a 10 %b = icmp sgt i32 %a, -1 11 %abs = select i1 %b, i32 %a, i32 %tmp1neg 12 ret i32 %abs 13 ; CHECK: cmp 14 ; CHECK: rsbmi r0, r0, #0 15 ; CHECK: bx lr 16 } 17 18 ; rdar://11633193 19 ;; 3 instructions will be generated for abs(a-b): 20 ;; subs 21 ;; rsbmi 22 ;; bx 23 define i32 @test2(i32 %a, i32 %b) nounwind readnone ssp { 24 entry: 25 ; CHECK: test2 26 ; CHECK: subs 27 ; CHECK-NEXT: rsbmi 28 ; CHECK-NEXT: bx 29 %sub = sub nsw i32 %a, %b 30 %cmp = icmp sgt i32 %sub, -1 31 %sub1 = sub nsw i32 0, %sub 32 %cond = select i1 %cmp, i32 %sub, i32 %sub1 33 ret i32 %cond 34 } 35
