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llvm-project/llvm/test/Transforms/InstCombine/malloc-free-delete.ll
Florian Hahn 0b21d55262 [IR] Mark memset.* intrinsics as IntrWriteMem. 
llvm.memset intrinsics do only write memory, but are missing
IntrWriteMem, so they doesNotReadMemory() returns false for them.

The test change is due to the test checking the fn attribute ids at the
call sites, which got bumped up due to a new combination with writeonly
appearing in the test file.

Reviewers: jdoerfert, reames, efriedma, nlopes, lebedev.ri

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D72789
2020-01-16 10:35:46 +00:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
; PR1201
define i32 @main(i32 %argc, i8** %argv) {
; CHECK-LABEL: @main(
; CHECK-NEXT: ret i32 0
;
%c_19 = alloca i8*
%malloc_206 = tail call i8* @malloc(i32 mul (i32 ptrtoint (i8* getelementptr (i8, i8* null, i32 1) to i32), i32 10))
store i8* %malloc_206, i8** %c_19
%tmp_207 = load i8*, i8** %c_19
tail call void @free(i8* %tmp_207)
ret i32 0
}
declare noalias i8* @calloc(i32, i32) nounwind
declare noalias i8* @malloc(i32)
declare void @free(i8*)
define i1 @foo() {
; CHECK-LABEL: @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.p0i8(i64, i8*)
declare void @llvm.lifetime.end.p0i8(i64, i8*)
declare i64 @llvm.objectsize.i64(i8*, i1)
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i1) nounwind
declare void @llvm.memmove.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i1) nounwind
declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i1) nounwind
define void @test3(i8* %src) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: ret void
;
%a = call noalias i8* @malloc(i32 10)
call void @llvm.lifetime.start.p0i8(i64 10, i8* %a)
call void @llvm.lifetime.end.p0i8(i64 10, i8* %a)
%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, i1 false)
call void @llvm.memmove.p0i8.p0i8.i32(i8* %a, i8* %src, i32 32, i1 false)
call void @llvm.memset.p0i8.i32(i8* %a, i8 5, i32 32, i1 false)
%alloc2 = call noalias i8* @calloc(i32 5, i32 7) nounwind
%z = icmp ne i8* %alloc2, null
ret void
}
;; This used to crash.
define void @test4() {
; CHECK-LABEL: @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
}
define void @test5(i8* %ptr, i8** %esc) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: [[A:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
; CHECK-NEXT: [[B:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
; CHECK-NEXT: [[C:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
; CHECK-NEXT: [[D:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
; CHECK-NEXT: [[E:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
; CHECK-NEXT: [[F:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
; CHECK-NEXT: [[G:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* nonnull align 1 dereferenceable(32) [[PTR:%.*]], i8* nonnull align 1 dereferenceable(32) [[A]], i32 32, i1 false)
; CHECK-NEXT: call void @llvm.memmove.p0i8.p0i8.i32(i8* nonnull align 1 dereferenceable(32) [[PTR]], i8* nonnull align 1 dereferenceable(32) [[B]], i32 32, i1 false)
; CHECK-NEXT: store i8* [[C]], i8** [[ESC:%.*]], align 8
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[D]], i8* [[PTR]], i32 32, i1 true)
; CHECK-NEXT: call void @llvm.memmove.p0i8.p0i8.i32(i8* [[E]], i8* [[PTR]], i32 32, i1 true)
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* [[F]], i8 5, i32 32, i1 true)
; CHECK-NEXT: store volatile i8 4, i8* [[G]], align 1
; CHECK-NEXT: ret void
;
%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, i1 false)
call void @llvm.memmove.p0i8.p0i8.i32(i8* %ptr, i8* %b, i32 32, i1 false)
store i8* %c, i8** %esc
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %d, i8* %ptr, i32 32, i1 true)
call void @llvm.memmove.p0i8.p0i8.i32(i8* %e, i8* %ptr, i32 32, i1 true)
call void @llvm.memset.p0i8.i32(i8* %f, i8 5, i32 32, i1 true)
store volatile i8 4, i8* %g
ret void
}
;; When a basic block contains only a call to free and this block is accessed
;; through a test of the argument of free against null, move the call in the
;; predecessor block.
;; Using simplifycfg will remove the empty basic block and the branch operation
;; Then, performing a dead elimination will remove the comparison.
;; This is what happens with -O1 and upper.
define void @test6(i8* %foo) minsize {
; CHECK-LABEL: @test6(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i8* [[FOO:%.*]], null
; CHECK-NEXT: tail call void @free(i8* [[FOO]])
; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
; CHECK: if.then:
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: ret void
;
;; Call to free moved
;; Block is now empty and may be simplified by simplifycfg
entry:
%tobool = icmp eq i8* %foo, null
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
tail call void @free(i8* %foo)
br label %if.end
if.end: ; preds = %entry, %if.then
ret void
}
declare i8* @_ZnwmRKSt9nothrow_t(i64, i8*) nobuiltin
declare void @_ZdlPvRKSt9nothrow_t(i8*, i8*) nobuiltin
declare i32 @__gxx_personality_v0(...)
declare void @_ZN1AC2Ev(i8* %this)
define void @test7() personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: entry:
; CHECK-NEXT: invoke void @_ZN1AC2Ev(i8* undef)
; CHECK-NEXT: to label [[DOTNOEXC_I:%.*]] unwind label [[LPAD_I:%.*]]
; CHECK: .noexc.i:
; CHECK-NEXT: unreachable
; CHECK: lpad.i:
; CHECK-NEXT: [[TMP0:%.*]] = landingpad { i8*, i32 }
; CHECK-NEXT: cleanup
; CHECK-NEXT: resume { i8*, i32 } [[TMP0]]
;
entry:
%nt = alloca i8
%call.i = tail call i8* @_ZnwmRKSt9nothrow_t(i64 1, i8* %nt) builtin nounwind
invoke void @_ZN1AC2Ev(i8* undef)
to label %.noexc.i unwind label %lpad.i
.noexc.i: ; preds = %entry
unreachable
lpad.i: ; preds = %entry
%0 = landingpad { i8*, i32 } cleanup
call void @_ZdlPvRKSt9nothrow_t(i8* %call.i, i8* %nt) builtin nounwind
resume { i8*, i32 } %0
}
declare i8* @_Znwm(i64) nobuiltin
define i8* @_Znwj(i32 %n) nobuiltin {
; CHECK-LABEL: @_Znwj(
; CHECK-NEXT: [[Z:%.*]] = zext i32 [[N:%.*]] to i64
; CHECK-NEXT: [[M:%.*]] = call i8* @_Znwm(i64 [[Z]])
; CHECK-NEXT: ret i8* [[M]]
;
%z = zext i32 %n to i64
%m = call i8* @_Znwm(i64 %z)
ret i8* %m
}
declare i8* @_Znam(i64) nobuiltin
declare i8* @_Znaj(i32) nobuiltin
declare void @_ZdlPv(i8*) nobuiltin
declare void @_ZdaPv(i8*) nobuiltin
define linkonce void @_ZdlPvm(i8* %p, i64) nobuiltin {
; CHECK-LABEL: @_ZdlPvm(
; CHECK-NEXT: call void @_ZdlPv(i8* [[P:%.*]])
; CHECK-NEXT: ret void
;
call void @_ZdlPv(i8* %p)
ret void
}
define linkonce void @_ZdlPvj(i8* %p, i32) nobuiltin {
; CHECK-LABEL: @_ZdlPvj(
; CHECK-NEXT: call void @_ZdlPv(i8* [[P:%.*]])
; CHECK-NEXT: ret void
;
call void @_ZdlPv(i8* %p)
ret void
}
define linkonce void @_ZdaPvm(i8* %p, i64) nobuiltin {
; CHECK-LABEL: @_ZdaPvm(
; CHECK-NEXT: call void @_ZdaPv(i8* [[P:%.*]])
; CHECK-NEXT: ret void
;
call void @_ZdaPv(i8* %p)
ret void
}
define linkonce void @_ZdaPvj(i8* %p, i32) nobuiltin {
; CHECK-LABEL: @_ZdaPvj(
; CHECK-NEXT: call void @_ZdaPv(i8* [[P:%.*]])
; CHECK-NEXT: ret void
;
call void @_ZdaPv(i8* %p)
ret void
}
; new(size_t, align_val_t)
declare i8* @_ZnwmSt11align_val_t(i64, i64) nobuiltin
declare i8* @_ZnwjSt11align_val_t(i32, i32) nobuiltin
; new[](size_t, align_val_t)
declare i8* @_ZnamSt11align_val_t(i64, i64) nobuiltin
declare i8* @_ZnajSt11align_val_t(i32, i32) nobuiltin
; new(size_t, align_val_t, nothrow)
declare i8* @_ZnwmSt11align_val_tRKSt9nothrow_t(i64, i64, i8*) nobuiltin
declare i8* @_ZnwjSt11align_val_tRKSt9nothrow_t(i32, i32, i8*) nobuiltin
; new[](size_t, align_val_t, nothrow)
declare i8* @_ZnamSt11align_val_tRKSt9nothrow_t(i64, i64, i8*) nobuiltin
declare i8* @_ZnajSt11align_val_tRKSt9nothrow_t(i32, i32, i8*) nobuiltin
; delete(void*, align_val_t)
declare void @_ZdlPvSt11align_val_t(i8*, i64) nobuiltin
; delete[](void*, align_val_t)
declare void @_ZdaPvSt11align_val_t(i8*, i64) nobuiltin
; delete(void*, align_val_t, nothrow)
declare void @_ZdlPvSt11align_val_tRKSt9nothrow_t(i8*, i64, i8*) nobuiltin
; delete[](void*, align_val_t, nothrow)
declare void @_ZdaPvSt11align_val_tRKSt9nothrow_t(i8*, i64, i8*) nobuiltin
define void @test8() {
; CHECK-LABEL: @test8(
; CHECK-NEXT: ret void
;
%nt = alloca i8
%nw = call i8* @_Znwm(i64 32) builtin
call void @_ZdlPv(i8* %nw) builtin
%na = call i8* @_Znam(i64 32) builtin
call void @_ZdaPv(i8* %na) builtin
%nwm = call i8* @_Znwm(i64 32) builtin
call void @_ZdlPvm(i8* %nwm, i64 32) builtin
%nwj = call i8* @_Znwj(i32 32) builtin
call void @_ZdlPvj(i8* %nwj, i32 32) builtin
%nam = call i8* @_Znam(i64 32) builtin
call void @_ZdaPvm(i8* %nam, i64 32) builtin
%naj = call i8* @_Znaj(i32 32) builtin
call void @_ZdaPvj(i8* %naj, i32 32) builtin
%nwa = call i8* @_ZnwmSt11align_val_t(i64 32, i64 8) builtin
call void @_ZdlPvSt11align_val_t(i8* %nwa, i64 8) builtin
%naa = call i8* @_ZnamSt11align_val_t(i64 32, i64 8) builtin
call void @_ZdaPvSt11align_val_t(i8* %naa, i64 8) builtin
%nwja = call i8* @_ZnwjSt11align_val_t(i32 32, i32 8) builtin
call void @_ZdlPvSt11align_val_t(i8* %nwja, i64 8) builtin
%naja = call i8* @_ZnajSt11align_val_t(i32 32, i32 8) builtin
call void @_ZdaPvSt11align_val_t(i8* %naja, i64 8) builtin
%nwat = call i8* @_ZnwmSt11align_val_tRKSt9nothrow_t(i64 32, i64 8, i8* %nt) builtin
call void @_ZdlPvSt11align_val_tRKSt9nothrow_t(i8* %nwat, i64 8, i8* %nt) builtin
%naat = call i8* @_ZnamSt11align_val_tRKSt9nothrow_t(i64 32, i64 8, i8* %nt) builtin
call void @_ZdaPvSt11align_val_tRKSt9nothrow_t(i8* %naat, i64 8, i8* %nt) builtin
%nwjat = call i8* @_ZnwjSt11align_val_tRKSt9nothrow_t(i32 32, i32 8, i8* %nt) builtin
call void @_ZdlPvSt11align_val_tRKSt9nothrow_t(i8* %nwjat, i64 8, i8* %nt) builtin
%najat = call i8* @_ZnajSt11align_val_tRKSt9nothrow_t(i32 32, i32 8, i8* %nt) builtin
call void @_ZdaPvSt11align_val_tRKSt9nothrow_t(i8* %najat, i64 8, i8* %nt) builtin
ret void
}
declare noalias i8* @"\01??2@YAPEAX_K@Z"(i64) nobuiltin
declare void @"\01??3@YAXPEAX@Z"(i8*) nobuiltin
define void @test9() {
; CHECK-LABEL: @test9(
; CHECK-NEXT: ret void
;
%new_long_long = call noalias i8* @"\01??2@YAPEAX_K@Z"(i64 32) builtin
call void @"\01??3@YAXPEAX@Z"(i8* %new_long_long) builtin
ret void
}
define void @test10() {
; CHECK-LABEL: @test10(
; CHECK-NEXT: call void @_ZdlPv(i8* null)
; CHECK-NEXT: ret void
;
call void @_ZdlPv(i8* null)
ret void
}
define void @test11() {
; CHECK-LABEL: @test11(
; CHECK-NEXT: [[CALL:%.*]] = call dereferenceable(8) i8* @_Znwm(i64 8) #6
; CHECK-NEXT: call void @_ZdlPv(i8* nonnull [[CALL]])
; CHECK-NEXT: ret void
;
%call = call i8* @_Znwm(i64 8) builtin
call void @_ZdlPv(i8* %call)
ret void
}
;; Check that the optimization that moves a call to free in its predecessor
;; block (see test6) also happens when noop casts are involved.
define void @test12(i32* %foo) minsize {
; CHECK-LABEL: @test12(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32* [[FOO:%.*]], null
; CHECK-NEXT: [[BITCAST:%.*]] = bitcast i32* [[FOO]] to i8*
; CHECK-NEXT: tail call void @free(i8* [[BITCAST]])
; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
; CHECK: if.then:
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: ret void
;
;; Everything before the call to free should have been moved as well.
;; Call to free moved
;; Block is now empty and may be simplified by simplifycfg
entry:
%tobool = icmp eq i32* %foo, null
br i1 %tobool, label %if.end, label %if.then
if.then: ; preds = %entry
%bitcast = bitcast i32* %foo to i8*
tail call void @free(i8* %bitcast)
br label %if.end
if.end: ; preds = %entry, %if.then
ret void
}
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