File: 2004-01-13-InstCombineInvokePHI.ll

package info (click to toggle)
llvm-toolchain-6.0 1:6.0-1~bpo9+1
  • links: PTS, VCS
  • area: main
  • in suites: stretch-backports
  • size: 594,652 kB
  • sloc: cpp: 3,044,500; ansic: 595,051; asm: 271,890; python: 128,923; objc: 106,554; sh: 21,854; lisp: 10,191; pascal: 6,094; ml: 5,544; perl: 5,265; makefile: 2,214; cs: 2,027; xml: 686; php: 212; csh: 117
file content (31 lines) | stat: -rw-r--r-- 1,163 bytes parent folder | download | duplicates (23)
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
; Test for a problem afflicting several C++ programs in the testsuite.  The 
; instcombine pass is trying to get rid of the cast in the invoke instruction, 
; inserting a cast of the return value after the PHI instruction, but which is
; used by the PHI instruction.  This is bad: because of the semantics of the
; invoke instruction, we really cannot perform this transformation at all at
; least without splitting the critical edge.
;
; RUN: opt < %s -instcombine -disable-output

declare i8* @test()

define i32 @foo() personality i32 (...)* @__gxx_personality_v0 {
entry:
        br i1 true, label %cont, label %call

call:           ; preds = %entry
        %P = invoke i32* bitcast (i8* ()* @test to i32* ()*)( )
                        to label %cont unwind label %N          ; <i32*> [#uses=1]

cont:           ; preds = %call, %entry
        %P2 = phi i32* [ %P, %call ], [ null, %entry ]          ; <i32*> [#uses=1]
        %V = load i32, i32* %P2              ; <i32> [#uses=1]
        ret i32 %V

N:              ; preds = %call
        %exn = landingpad {i8*, i32}
                 cleanup
        ret i32 0
}

declare i32 @__gxx_personality_v0(...)