1; RUN: llc -mattr=avr6 < %s -mtriple=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: lsl {{.*}}[[LOW]] 17; CHECK: sbc {{.*}}[[LOW]], {{.*}}[[LOW]] 18; CHECK: ldi [[RET:r[0-9]+]], 1 19; CHECK: cp {{.*}}[[HIGH]], {{.*}}[[LOW]] 20; CHECK: brne [[LABEL:.LBB[_0-9]+]] 21; CHECK: mov {{.*}}[[RET]], r1 22; CHECK: {{.*}}[[LABEL]] 23; CHECK: ret 24} 25 26declare { i8, i1 } @llvm.smul.with.overflow.i8(i8, i8) 27