File: hardware-mul.ll

package info (click to toggle)
llvm-toolchain-13 1%3A13.0.1-6~deb11u1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 1,418,812 kB
  • sloc: cpp: 5,290,827; ansic: 996,570; asm: 544,593; python: 188,212; objc: 72,027; lisp: 30,291; f90: 25,395; sh: 24,900; javascript: 9,780; pascal: 9,398; perl: 7,484; ml: 5,432; awk: 3,523; makefile: 2,892; xml: 953; cs: 573; fortran: 539
file content (30 lines) | stat: -rw-r--r-- 668 bytes parent folder | download | duplicates (7) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
 
; RUN: llc -mattr=mul,movw < %s -march=avr | FileCheck %s

; Tests lowering of multiplication to hardware instructions.

define i8 @mult8(i8 %a, i8 %b) {
; CHECK-LABEL: mult8:
; CHECK: muls r22, r24
; CHECK: clr r1
; CHECK: mov  r24, r0
  %mul = mul i8 %b, %a
  ret i8 %mul
}

define i16 @mult16(i16 %a, i16 %b) {
; CHECK-LABEL: mult16:
; CHECK: muls r22, r25
; CHECK: mov  r18, r0
; CHECK: mul  r22, r24
; CHECK: mov  r19, r0
; CHECK: mov  r20, r1
; CHECK: clr r1
; CHECK: add  r20, r18
; CHECK: muls r23, r24
; CHECK: clr r1
; CHECK: mov  r22, r0
; CHECK: add  r22, r20
; :TODO: finish after reworking shift instructions
  %mul = mul nsw i16 %b, %a
  ret i16 %mul
}