blob: 745e93005cc2f22400f94409393ad1311addf28c [file] [log] [blame]
; RUN: llc < %s -march=avr | FileCheck %s
define i1 @signed_multiplication_did_overflow(i8, i8) unnamed_addr {
; CHECK-LABEL: signed_multiplication_did_overflow:
entry-block:
%2 = tail call { i8, i1 } @llvm.smul.with.overflow.i8(i8 %0, i8 %1)
%3 = extractvalue { i8, i1 } %2, 1
ret i1 %3
; Multiply, fill the low byte with the sign of the low byte via
; arithmetic shifting, compare it to the high byte.
;
; CHECK: muls r24, r22
; CHECK: mov [[HIGH:r[0-9]+]], r1
; CHECK: mov [[LOW:r[0-9]+]], r0
; CHECK: asr {{.*}}[[LOW]]
; CHECK: asr {{.*}}[[LOW]]
; CHECK: asr {{.*}}[[LOW]]
; CHECK: asr {{.*}}[[LOW]]
; CHECK: asr {{.*}}[[LOW]]
; CHECK: asr {{.*}}[[LOW]]
; CHECK: asr {{.*}}[[LOW]]
; CHECK: ldi [[RET:r[0-9]+]], 1
; CHECK: cp {{.*}}[[HIGH]], {{.*}}[[LOW]]
; CHECK: brne [[LABEL:LBB[_0-9]+]]
; CHECK: ldi {{.*}}[[RET]], 0
; CHECK: {{.*}}[[LABEL]]
; CHECK: ret
}
declare { i8, i1 } @llvm.smul.with.overflow.i8(i8, i8)