1; RUN: llc < %s -march=avr | FileCheck %s 2 3define i1 @signed_multiplication_did_overflow(i8, i8) unnamed_addr { 4; CHECK-LABEL: signed_multiplication_did_overflow: 5entry-block: 6 %2 = tail call { i8, i1 } @llvm.smul.with.overflow.i8(i8 %0, i8 %1) 7 %3 = extractvalue { i8, i1 } %2, 1 8 ret i1 %3 9 10; Multiply, fill the low byte with the sign of the low byte via 11; arithmetic shifting, compare it to the high byte. 12; 13; CHECK: muls r24, r22 14; CHECK: mov [[HIGH:r[0-9]+]], r1 15; CHECK: mov [[LOW:r[0-9]+]], r0 16; CHECK: asr {{.*}}[[LOW]] 17; CHECK: asr {{.*}}[[LOW]] 18; CHECK: asr {{.*}}[[LOW]] 19; CHECK: asr {{.*}}[[LOW]] 20; CHECK: asr {{.*}}[[LOW]] 21; CHECK: asr {{.*}}[[LOW]] 22; CHECK: asr {{.*}}[[LOW]] 23; CHECK: ldi [[RET:r[0-9]+]], 1 24; CHECK: cp {{.*}}[[HIGH]], {{.*}}[[LOW]] 25; CHECK: brne [[LABEL:LBB[_0-9]+]] 26; CHECK: ldi {{.*}}[[RET]], 0 27; CHECK: {{.*}}[[LABEL]] 28; CHECK: ret 29} 30 31declare { i8, i1 } @llvm.smul.with.overflow.i8(i8, i8) 32