mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-26 07:29:55 +00:00
This means we can do cheap DSE for heap memory. Nothing is done if the pointer excapes or has a load. The churn in the tests is mostly due to objectsize, since we want to make sure we don't delete the malloc call before evaluating the objectsize (otherwise it becomes -1/0) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159876 91177308-0d34-0410-b5e6-96231b3b80d8
42 lines
919 B
LLVM
42 lines
919 B
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
|
|
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"
|
|
target triple = "x86_64-apple-darwin10.0"
|
|
|
|
declare noalias i8* @malloc(i64) nounwind
|
|
declare void @free(i8*)
|
|
|
|
; PR5130
|
|
define i1 @test1() {
|
|
%A = call noalias i8* @malloc(i64 4) nounwind
|
|
%B = icmp eq i8* %A, null
|
|
store i8 0, i8* %A
|
|
|
|
call void @free(i8* %A)
|
|
ret i1 %B
|
|
|
|
; CHECK: @test1
|
|
; CHECK: ret i1 false
|
|
}
|
|
|
|
; CHECK: @test2
|
|
define noalias i8* @test2() nounwind {
|
|
entry:
|
|
; CHECK: @malloc
|
|
%A = call noalias i8* @malloc(i64 4) nounwind
|
|
; CHECK: icmp eq
|
|
%tobool = icmp eq i8* %A, null
|
|
; CHECK: br i1
|
|
br i1 %tobool, label %return, label %if.end
|
|
|
|
if.end:
|
|
; CHECK: store
|
|
store i8 7, i8* %A
|
|
br label %return
|
|
|
|
return:
|
|
; CHECK: phi
|
|
%retval.0 = phi i8* [ %A, %if.end ], [ null, %entry ]
|
|
ret i8* %retval.0
|
|
}
|