File: neg-shl-add.ll

package info (click to toggle)
llvm-toolchain-13 1%3A13.0.1-11
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,418,840 kB
  • sloc: cpp: 5,290,826; ansic: 996,570; asm: 544,593; python: 188,212; objc: 72,027; lisp: 30,291; f90: 25,395; sh: 24,898; javascript: 9,780; pascal: 9,398; perl: 7,484; ml: 5,432; awk: 3,523; makefile: 2,913; xml: 953; cs: 573; fortran: 539
file content (33 lines) | stat: -rw-r--r-- 996 bytes parent folder | download | duplicates (23) 
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
31
32
33
 
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=x86_64-- < %s | FileCheck %s
; These sequences don't need neg instructions; they can be done with
; a single shift and sub each.

define i64 @foo(i64 %x, i64 %y, i64 %n) nounwind {
; CHECK-LABEL: foo:
; CHECK:       # %bb.0:
; CHECK-NEXT:    movq %rdx, %rcx
; CHECK-NEXT:    movq %rdi, %rax
; CHECK-NEXT:    # kill: def $cl killed $cl killed $rcx
; CHECK-NEXT:    shlq %cl, %rsi
; CHECK-NEXT:    subq %rsi, %rax
; CHECK-NEXT:    retq
  %a = sub i64 0, %y
  %b = shl i64 %a, %n
  %c = add i64 %b, %x
  ret i64 %c
}
define i64 @boo(i64 %x, i64 %y, i64 %n) nounwind {
; CHECK-LABEL: boo:
; CHECK:       # %bb.0:
; CHECK-NEXT:    movq %rdx, %rcx
; CHECK-NEXT:    movq %rdi, %rax
; CHECK-NEXT:    # kill: def $cl killed $cl killed $rcx
; CHECK-NEXT:    shlq %cl, %rsi
; CHECK-NEXT:    subq %rsi, %rax
; CHECK-NEXT:    retq
  %a = sub i64 0, %y
  %b = shl i64 %a, %n
  %c = add i64 %x, %b
  ret i64 %c
}