mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-09 15:57:28 +00:00
Don't replace a gep/bitcast with 'undef' because that will form a "free(undef)" which in turn means "unreachable". What we wanted was a no-op. Instead, analyze the whole tree and look for all the instructions we need to delete first, then delete them second, not relying on the use_list to stay consistent. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136752 91177308-0d34-0410-b5e6-96231b3b80d8
49 lines
1.1 KiB
LLVM
49 lines
1.1 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
; PR1201
|
|
define i32 @main(i32 %argc, i8** %argv) {
|
|
%c_19 = alloca i8*
|
|
%malloc_206 = tail call i8* @malloc(i32 mul (i32 ptrtoint (i8* getelementptr (i8* null, i32 1) to i32), i32 10))
|
|
store i8* %malloc_206, i8** %c_19
|
|
%tmp_207 = load i8** %c_19
|
|
tail call void @free(i8* %tmp_207)
|
|
ret i32 0
|
|
; CHECK-NOT: malloc
|
|
; CHECK-NOT: free
|
|
; CHECK: ret i32 0
|
|
}
|
|
|
|
declare noalias 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
|
|
}
|
|
|
|
declare void @llvm.lifetime.start(i64, i8*)
|
|
declare void @llvm.lifetime.end(i64, i8*)
|
|
|
|
define void @test3() {
|
|
; CHECK: @test3
|
|
; CHECK-NEXT: ret void
|
|
%a = call noalias i8* @malloc(i32 10)
|
|
call void @llvm.lifetime.start(i64 10, i8* %a)
|
|
call void @llvm.lifetime.end(i64 10, i8* %a)
|
|
ret void
|
|
}
|
|
|
|
;; This used to crash.
|
|
define void @test4() {
|
|
; CHECK: @test4
|
|
; CHECK-NEXT: ret void
|
|
%A = call i8* @malloc(i32 16000)
|
|
%B = bitcast i8* %A to double*
|
|
%C = bitcast double* %B to i8*
|
|
call void @free(i8* %C)
|
|
ret void
|
|
}
|