File: zext-phi.ll

package info (click to toggle)
swiftlang 6.1.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,791,604 kB
  • sloc: cpp: 9,901,740; ansic: 2,201,431; asm: 1,091,827; python: 308,252; objc: 82,166; f90: 80,126; lisp: 38,358; pascal: 25,559; sh: 20,429; ml: 5,058; perl: 4,745; makefile: 4,484; awk: 3,535; javascript: 3,018; xml: 918; fortran: 664; cs: 573; ruby: 396
file content (32 lines) | stat: -rw-r--r-- 869 bytes parent folder | download | duplicates (12) 
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
}