File: zext-phi.ll

package info (click to toggle)
llvm-toolchain-17 1%3A17.0.6-22
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,799,624 kB
  • sloc: cpp: 6,428,607; ansic: 1,383,196; asm: 793,408; python: 223,504; objc: 75,364; f90: 60,502; lisp: 33,869; pascal: 15,282; sh: 9,684; perl: 7,453; ml: 4,937; awk: 3,523; makefile: 2,889; javascript: 2,149; xml: 888; fortran: 619; cs: 573
file content (32 lines) | stat: -rw-r--r-- 869 bytes parent folder | download | duplicates (9) 
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
 
; RUN: opt < %s -passes=instcombine -S | FileCheck %s

target datalayout = "e-m:e-i64:64-n8:16:32:64"

; Although i1 is not in the datalayout, we should treat it
; as a legal type because it is a fundamental type in IR.
; This means we should shrink the phi (sink the zexts).

define i64 @sink_i1_casts(i1 %cond1, i1 %cond2) {
; CHECK-LABEL: @sink_i1_casts(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 %cond1, label %if, label %end
; CHECK:       if:
; CHECK-NEXT:    br label %end
; CHECK:       end:
; CHECK-NEXT:    [[PHI_IN:%.*]] = phi i1 [ %cond1, %entry ], [ %cond2, %if ]
; CHECK-NEXT:    [[PHI:%.*]] = zext i1 [[PHI_IN]] to i64
; CHECK-NEXT:    ret i64 [[PHI]]
;
entry:
  %z1 = zext i1 %cond1 to i64
  br i1 %cond1, label %if, label %end

if:
  %z2 = zext i1 %cond2 to i64
  br label %end

end:
  %phi = phi i64 [ %z1, %entry ], [ %z2, %if ]
  ret i64 %phi
}