File: select-1-or-neg1.ll

package info (click to toggle)
llvm-toolchain-9 1%3A9.0.1-16
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 882,436 kB
  • sloc: cpp: 4,167,636; ansic: 714,256; asm: 457,610; python: 155,927; objc: 65,094; sh: 42,856; lisp: 26,908; perl: 7,786; pascal: 7,722; makefile: 6,881; ml: 5,581; awk: 3,648; cs: 2,027; xml: 888; javascript: 381; ruby: 156
file content (29 lines) | stat: -rw-r--r-- 964 bytes parent folder | download | duplicates (5)
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
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-unknown-unknown                      | FileCheck %s --check-prefix=BASE
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=slow-3ops-lea | FileCheck %s --check-prefix=SLOWLEA3

; TODO: Should the 'cmpl' be 'dec' instead?
; TODO: What if 'cmov' is 1 uop and full throughput (Ryzen)?

define i32 @PR28968(i32 %x) {
; BASE-LABEL: PR28968:
; BASE:       # %bb.0:
; BASE-NEXT:    xorl %eax, %eax
; BASE-NEXT:    cmpl $1, %edi
; BASE-NEXT:    sete %al
; BASE-NEXT:    leal -1(%rax,%rax), %eax
; BASE-NEXT:    retq
;
; SLOWLEA3-LABEL: PR28968:
; SLOWLEA3:       # %bb.0:
; SLOWLEA3-NEXT:    xorl %eax, %eax
; SLOWLEA3-NEXT:    cmpl $1, %edi
; SLOWLEA3-NEXT:    sete %al
; SLOWLEA3-NEXT:    leal (%rax,%rax), %eax
; SLOWLEA3-NEXT:    addl $-1, %eax
; SLOWLEA3-NEXT:    retq
  %cmp = icmp eq i32 %x, 1
  %sel = select i1 %cmp, i32 1, i32 -1
  ret i32 %sel
}