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llvm-project/llvm/test/Transforms/InstCombine/malloc-free-delete.ll

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Teach instCombine to remove malloc+free if malloc's only uses are comparisons to null. Patch by Matti Niemenmaa. llvm-svn: 104871
2010-05-28 03:09:06 +08:00
; RUN: opt < %s -instcombine -S | FileCheck %s
testcase for PR1201 llvm-svn: 35980
2007-04-14 08:19:36 +08:00
; PR1201
define i32 @main(i32 %argc, i8** %argv) {
teach instcombine to remove allocated buffers even if there are stores, memcpy/memmove/memset, and objectsize users. 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) llvm-svn: 159876
2012-07-07 07:09:25 +08:00
; CHECK: @main
manually upgrade a bunch of tests to modern syntax, and remove some that are either unreduced or only test old syntax. llvm-svn: 133228
2011-06-17 11:14:27 +08:00
%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
teach instcombine to remove allocated buffers even if there are stores, memcpy/memmove/memset, and objectsize users. 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) llvm-svn: 159876
2012-07-07 07:09:25 +08:00
; CHECK-NEXT: ret i32 0
testcase for PR1201 llvm-svn: 35980
2007-04-14 08:19:36 +08:00
}
Teach instCombine to remove malloc+free if malloc's only uses are comparisons to null. Patch by Matti Niemenmaa. llvm-svn: 104871
2010-05-28 03:09:06 +08:00
teach instcombine to remove allocated buffers even if there are stores, memcpy/memmove/memset, and objectsize users. 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) llvm-svn: 159876
2012-07-07 07:09:25 +08:00
declare noalias i8* @calloc(i32, i32) nounwind
Teach InstCombine that lifetime intrincs aren't a real user on the result of a malloc call. llvm-svn: 136732
2011-08-03 06:08:01 +08:00
declare noalias i8* @malloc(i32)
Teach instCombine to remove malloc+free if malloc's only uses are comparisons to null. Patch by Matti Niemenmaa. llvm-svn: 104871
2010-05-28 03:09:06 +08:00
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
}
Teach InstCombine that lifetime intrincs aren't a real user on the result of a malloc call. llvm-svn: 136732
2011-08-03 06:08:01 +08:00
declare void @llvm.lifetime.start(i64, i8*)
declare void @llvm.lifetime.end(i64, i8*)
teach instcombine to remove allocated buffers even if there are stores, memcpy/memmove/memset, and objectsize users. 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) llvm-svn: 159876
2012-07-07 07:09:25 +08:00
declare i64 @llvm.objectsize.i64(i8*, i1)
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
declare void @llvm.memmove.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i32, i1) nounwind
Teach InstCombine that lifetime intrincs aren't a real user on the result of a malloc call. llvm-svn: 136732
2011-08-03 06:08:01 +08:00
teach instcombine to remove allocated buffers even if there are stores, memcpy/memmove/memset, and objectsize users. 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) llvm-svn: 159876
2012-07-07 07:09:25 +08:00
define void @test3(i8* %src) {
Teach InstCombine that lifetime intrincs aren't a real user on the result of a malloc call. llvm-svn: 136732
2011-08-03 06:08:01 +08:00
; 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)
teach instcombine to remove allocated buffers even if there are stores, memcpy/memmove/memset, and objectsize users. 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) llvm-svn: 159876
2012-07-07 07:09:25 +08:00
%size = call i64 @llvm.objectsize.i64(i8* %a, i1 true)
store i8 42, i8* %a
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %a, i8* %src, i32 32, i32 1, i1 false)
call void @llvm.memmove.p0i8.p0i8.i32(i8* %a, i8* %src, i32 32, i32 1, i1 false)
call void @llvm.memset.p0i8.i32(i8* %a, i8 5, i32 32, i32 1, i1 false)
%alloc2 = call noalias i8* @calloc(i32 5, i32 7) nounwind
%z = icmp ne i8* %alloc2, null
Teach InstCombine that lifetime intrincs aren't a real user on the result of a malloc call. llvm-svn: 136732
2011-08-03 06:08:01 +08:00
ret void
}
Fix logical error when detecting lifetime intrinsics. 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. llvm-svn: 136752
2011-08-03 08:43:35 +08:00
;; 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
}
teach instcombine to remove allocated buffers even if there are stores, memcpy/memmove/memset, and objectsize users. 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) llvm-svn: 159876
2012-07-07 07:09:25 +08:00
; CHECK: @test5
define void @test5(i8* %ptr, i8** %esc) {
; CHECK-NEXT: call i8* @malloc
; CHECK-NEXT: call i8* @malloc
; CHECK-NEXT: call i8* @malloc
; CHECK-NEXT: call i8* @malloc
; CHECK-NEXT: call i8* @malloc
; CHECK-NEXT: call i8* @malloc
; CHECK-NEXT: call i8* @malloc
; CHECK-NEXT: call void @llvm.memcpy
; CHECK-NEXT: call void @llvm.memmove
; CHECK-NEXT: store
; CHECK-NEXT: call void @llvm.memcpy
; CHECK-NEXT: call void @llvm.memmove
; CHECK-NEXT: call void @llvm.memset
; CHECK-NEXT: store volatile
; CHECK-NEXT: ret
%a = call i8* @malloc(i32 700)
%b = call i8* @malloc(i32 700)
%c = call i8* @malloc(i32 700)
%d = call i8* @malloc(i32 700)
%e = call i8* @malloc(i32 700)
%f = call i8* @malloc(i32 700)
%g = call i8* @malloc(i32 700)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %ptr, i8* %a, i32 32, i32 1, i1 false)
call void @llvm.memmove.p0i8.p0i8.i32(i8* %ptr, i8* %b, i32 32, i32 1, i1 false)
store i8* %c, i8** %esc
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %d, i8* %ptr, i32 32, i32 1, i1 true)
call void @llvm.memmove.p0i8.p0i8.i32(i8* %e, i8* %ptr, i32 32, i32 1, i1 true)
call void @llvm.memset.p0i8.i32(i8* %f, i8 5, i32 32, i32 1, i1 true)
store volatile i8 4, i8* %g
ret void
}