llvm-6502/test/Transforms/InstCombine/malloc-free-delete.ll
Duncan Sands 1d9b973fd7 Teach instCombine to remove malloc+free if malloc's only uses are comparisons
to null.  Patch by Matti Niemenmaa.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104871 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-27 19:09:06 +00:00

26 lines
555 B
LLVM

; RUN: opt < %s -instcombine -S | FileCheck %s
; PR1201
define i32 @main(i32 %argc, i8** %argv) {
%c_19 = alloca i8*
%malloc_206 = malloc i8, i32 10
; CHECK-NOT: malloc
store i8* %malloc_206, i8** %c_19
%tmp_207 = load i8** %c_19
free i8* %tmp_207
; CHECK-NOT: free
ret i32 0
; CHECK: ret i32 0
}
declare i8* @malloc(i32)
declare void @free(i8*)
define i1 @foo() {
; CHECK: @foo
; CHECK-NEXT: ret i1 false
%m = call i8* @malloc(i32 1)
%z = icmp eq i8* %m, null
call void @free(i8* %m)
ret i1 %z
}