File: 2012-09-17-ZeroSizedAlloca.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 (22 lines) | stat: -rw-r--r-- 686 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
 
; RUN: opt -S -passes=instcombine < %s | FileCheck %s

; When merging zero sized alloca check that requested alignments of the allocas
; are obeyed.

target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"

@x = global ptr null, align 8
@y = global ptr null, align 8

; CHECK-LABEL: @f(
; CHECK-NEXT: alloca [0 x i8], align 1024
; CHECK-NOT: alloca
; CHECK: ret void
define void @f() {
  %1 = alloca [0 x i8], align 1
  %2 = alloca [0 x i8], align 1024
  store ptr %1, ptr @x, align 8
  store ptr %2, ptr @y, align 8
  ret void
}