File: partialord-ule.ll

package info (click to toggle)
llvm-toolchain-16 1%3A16.0.6-15~deb12u1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,634,792 kB
  • sloc: cpp: 6,179,261; ansic: 1,216,205; asm: 741,319; python: 196,614; objc: 75,325; f90: 49,640; lisp: 32,396; pascal: 12,286; sh: 9,394; perl: 7,442; ml: 5,494; awk: 3,523; makefile: 2,723; javascript: 1,206; xml: 886; fortran: 581; cs: 573
file content (30 lines) | stat: -rw-r--r-- 805 bytes parent folder | download | duplicates (15) 
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
 
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -O1 -S < %s | FileCheck %s

; This is a very convoluted way to write an icmp ule, which comes about by
; matching against a three-way comparison result.
define i1 @ule(i32 %a, i32 %b) {
; CHECK-LABEL: @ule(
; CHECK-NEXT:  start:
; CHECK-NEXT:    [[DOTNOT:%.*]] = icmp ule i32 [[A:%.*]], [[B:%.*]]
; CHECK-NEXT:    ret i1 [[DOTNOT]]
;
start:
  %cmp1 = icmp eq i32 %a, %b
  %cmp2 = icmp ult i32 %a, %b
  %cmp3 = icmp ne i32 %a, %b
  %zext = zext i1 %cmp3 to i64
  %sel1 = select i1 %cmp2, i64 -1, i64 %zext
  %sel2 = select i1 %cmp1, i64 0, i64 %sel1
  switch i64 %sel2, label %exit [
  i64 -1, label %bb
  i64 0, label %bb
  ]

bb:
  br label %exit

exit:
  %res = phi i1 [ true, %bb ], [ false, %start ]
  ret i1 %res
}