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[x86] add select test to show there's no single right answer (PR28968); NFC

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llvm-svn: 324947
This commit is contained in:
Sanjay Patel 2018-02-12 22:19:24 +00:00
parent 07830357bc
commit 40af1ce565
1 changed files with 29 additions and 0 deletions
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29
test/CodeGen/X86/select-1-or-neg1.ll Normal file
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; 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
}