File: extractelement-shuffle.ll

package info (click to toggle)
llvm 2.6-9.1
  • links: PTS
  • area: main
  • in suites: squeeze
  • size: 57,604 kB
  • ctags: 44,336
  • sloc: cpp: 344,766; sh: 12,407; ansic: 10,617; ada: 3,070; ml: 2,505; perl: 2,496; makefile: 1,426; pascal: 1,163; exp: 389; asm: 307; python: 298; objc: 260; lisp: 182; csh: 117; xml: 38; f90: 36; tcl: 20
file content (13 lines) | stat: -rw-r--r-- 576 bytes parent folder | download 
1
2
3
4
5
6
7
8
9
10
11
12
13
 
; RUN: llvm-as < %s | llc

; Examples that exhibits a bug in DAGCombine.  The case is triggered by the
; following program.  The bug is DAGCombine assumes that the bit convert
; preserves the number of elements so the optimization code tries to read
; through the 3rd mask element, which doesn't exist.
define i32 @update(<2 x i64> %val1, <2 x i64> %val2) nounwind readnone {
entry:
	%shuf = shufflevector <2 x i64> %val1, <2 x i64> %val2, <2 x i32> <i32 0, i32 3>;
	%bit  = bitcast <2 x i64> %shuf to <4 x i32>;
	%res =  extractelement <4 x i32> %bit, i32 3;
	ret i32 %res;
}