288 lines
10 KiB
LLVM
288 lines
10 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; PR1201
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define i32 @main(i32 %argc, i8** %argv) {
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; CHECK-LABEL: @main(
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; CHECK-NEXT: ret i32 0
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;
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%c_19 = alloca i8*
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%malloc_206 = tail call i8* @malloc(i32 mul (i32 ptrtoint (i8* getelementptr (i8, i8* null, i32 1) to i32), i32 10))
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store i8* %malloc_206, i8** %c_19
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%tmp_207 = load i8*, i8** %c_19
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tail call void @free(i8* %tmp_207)
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ret i32 0
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}
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define i32 @dead_aligned_alloc(i32 %size, i32 %alignment, i8 %value) {
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; CHECK-LABEL: @dead_aligned_alloc(
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; CHECK-NEXT: ret i32 0
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;
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%aligned_allocation = tail call i8* @aligned_alloc(i32 %alignment, i32 %size)
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store i8 %value, i8* %aligned_allocation
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tail call void @free(i8* %aligned_allocation)
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ret i32 0
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}
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declare noalias i8* @calloc(i32, i32) nounwind
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declare noalias i8* @malloc(i32)
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declare noalias i8* @aligned_alloc(i32, i32)
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declare void @free(i8*)
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define i1 @foo() {
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; CHECK-LABEL: @foo(
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; CHECK-NEXT: ret i1 false
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;
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%m = call i8* @malloc(i32 1)
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%z = icmp eq i8* %m, null
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call void @free(i8* %m)
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ret i1 %z
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}
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declare void @llvm.lifetime.start.p0i8(i64, i8*)
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declare void @llvm.lifetime.end.p0i8(i64, i8*)
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declare i64 @llvm.objectsize.i64(i8*, i1)
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i1) nounwind
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declare void @llvm.memmove.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i1) nounwind
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declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i1) nounwind
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define void @test3(i8* %src) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: ret void
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;
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%a = call noalias i8* @malloc(i32 10)
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call void @llvm.lifetime.start.p0i8(i64 10, i8* %a)
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call void @llvm.lifetime.end.p0i8(i64 10, i8* %a)
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%size = call i64 @llvm.objectsize.i64(i8* %a, i1 true)
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store i8 42, i8* %a
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %a, i8* %src, i32 32, i1 false)
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call void @llvm.memmove.p0i8.p0i8.i32(i8* %a, i8* %src, i32 32, i1 false)
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call void @llvm.memset.p0i8.i32(i8* %a, i8 5, i32 32, i1 false)
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%alloc2 = call noalias i8* @calloc(i32 5, i32 7) nounwind
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%z = icmp ne i8* %alloc2, null
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ret void
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}
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;; This used to crash.
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define void @test4() {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: ret void
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;
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%A = call i8* @malloc(i32 16000)
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%B = bitcast i8* %A to double*
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%C = bitcast double* %B to i8*
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call void @free(i8* %C)
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ret void
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}
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define void @test5(i8* %ptr, i8** %esc) {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: [[A:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
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; CHECK-NEXT: [[B:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
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; CHECK-NEXT: [[C:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
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; CHECK-NEXT: [[D:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
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; CHECK-NEXT: [[E:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
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; CHECK-NEXT: [[F:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
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; CHECK-NEXT: [[G:%.*]] = call dereferenceable_or_null(700) i8* @malloc(i32 700)
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* noundef nonnull align 1 dereferenceable(32) [[PTR:%.*]], i8* noundef nonnull align 1 dereferenceable(32) [[A]], i32 32, i1 false)
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; CHECK-NEXT: call void @llvm.memmove.p0i8.p0i8.i32(i8* noundef nonnull align 1 dereferenceable(32) [[PTR]], i8* noundef nonnull align 1 dereferenceable(32) [[B]], i32 32, i1 false)
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; CHECK-NEXT: store i8* [[C]], i8** [[ESC:%.*]], align 8
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[D]], i8* [[PTR]], i32 32, i1 true)
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; CHECK-NEXT: call void @llvm.memmove.p0i8.p0i8.i32(i8* [[E]], i8* [[PTR]], i32 32, i1 true)
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; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* [[F]], i8 5, i32 32, i1 true)
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; CHECK-NEXT: store volatile i8 4, i8* [[G]], align 1
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; CHECK-NEXT: ret void
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;
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%a = call i8* @malloc(i32 700)
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%b = call i8* @malloc(i32 700)
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%c = call i8* @malloc(i32 700)
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%d = call i8* @malloc(i32 700)
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%e = call i8* @malloc(i32 700)
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%f = call i8* @malloc(i32 700)
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%g = call i8* @malloc(i32 700)
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %ptr, i8* %a, i32 32, i1 false)
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call void @llvm.memmove.p0i8.p0i8.i32(i8* %ptr, i8* %b, i32 32, i1 false)
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store i8* %c, i8** %esc
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %d, i8* %ptr, i32 32, i1 true)
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call void @llvm.memmove.p0i8.p0i8.i32(i8* %e, i8* %ptr, i32 32, i1 true)
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call void @llvm.memset.p0i8.i32(i8* %f, i8 5, i32 32, i1 true)
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store volatile i8 4, i8* %g
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ret void
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}
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;; When a basic block contains only a call to free and this block is accessed
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;; through a test of the argument of free against null, move the call in the
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;; predecessor block.
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;; Using simplifycfg will remove the empty basic block and the branch operation
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;; Then, performing a dead elimination will remove the comparison.
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;; This is what happens with -O1 and upper.
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define void @test6(i8* %foo) minsize {
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; CHECK-LABEL: @test6(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i8* [[FOO:%.*]], null
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; CHECK-NEXT: tail call void @free(i8* [[FOO]])
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; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: ret void
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;
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;; Call to free moved
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;; Block is now empty and may be simplified by simplifycfg
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entry:
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%tobool = icmp eq i8* %foo, null
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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tail call void @free(i8* %foo)
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br label %if.end
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if.end: ; preds = %entry, %if.then
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ret void
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}
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;; Check that the optimization that moves a call to free in its predecessor
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;; block (see test6) also happens when noop casts are involved.
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define void @test12(i32* %foo) minsize {
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32* [[FOO:%.*]], null
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; CHECK-NEXT: [[BITCAST:%.*]] = bitcast i32* [[FOO]] to i8*
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; CHECK-NEXT: tail call void @free(i8* [[BITCAST]])
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; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: ret void
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;
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;; Everything before the call to free should have been moved as well.
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;; Call to free moved
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;; Block is now empty and may be simplified by simplifycfg
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entry:
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%tobool = icmp eq i32* %foo, null
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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%bitcast = bitcast i32* %foo to i8*
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tail call void @free(i8* %bitcast)
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br label %if.end
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if.end: ; preds = %entry, %if.then
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ret void
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}
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;; Test that nonnull-implying attributes on the parameter are adjusted when the
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;; call is moved, since they may no longer be valid and result in miscompiles if
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;; kept unchanged.
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define void @test_nonnull_free_move(i8* %foo) minsize {
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; CHECK-LABEL: @test_nonnull_free_move(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i8* [[FOO:%.*]], null
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; CHECK-NEXT: tail call void @free(i8* [[FOO]])
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; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: ret void
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;
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entry:
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%tobool = icmp eq i8* %foo, null
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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tail call void @free(i8* nonnull %foo)
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br label %if.end
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if.end: ; preds = %entry, %if.then
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ret void
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}
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define void @test_dereferenceable_free_move(i8* %foo) minsize {
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; CHECK-LABEL: @test_dereferenceable_free_move(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i8* [[FOO:%.*]], null
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; CHECK-NEXT: tail call void @free(i8* dereferenceable_or_null(4) [[FOO]])
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; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: ret void
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;
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entry:
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%tobool = icmp eq i8* %foo, null
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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tail call void @free(i8* dereferenceable(4) %foo)
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br label %if.end
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if.end: ; preds = %entry, %if.then
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ret void
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}
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define void @test_nonnull_dereferenceable_free_move(i8* %foo) minsize {
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; CHECK-LABEL: @test_nonnull_dereferenceable_free_move(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i8* [[FOO:%.*]], null
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; CHECK-NEXT: tail call void @free(i8* dereferenceable_or_null(16) [[FOO]])
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; CHECK-NEXT: br i1 [[TOBOOL]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: br label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: ret void
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;
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entry:
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%tobool = icmp eq i8* %foo, null
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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tail call void @free(i8* nonnull dereferenceable(16) %foo)
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br label %if.end
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if.end: ; preds = %entry, %if.then
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ret void
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}
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; The next four tests cover the semantics of the nofree attributes. These
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; are thought to be legal transforms, but an implementation thereof has
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; been reverted once due to difficult to isolate fallout.
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; TODO: Freeing a no-free pointer -> %foo must be null
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define void @test13(i8* nofree %foo) {
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; CHECK-LABEL: @test13(
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; CHECK-NEXT: call void @free(i8* [[FOO:%.*]])
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; CHECK-NEXT: ret void
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;
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call void @free(i8* %foo)
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ret void
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}
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; TODO: Freeing a no-free pointer -> %foo must be null
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define void @test14(i8* %foo) nofree {
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; CHECK-LABEL: @test14(
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; CHECK-NEXT: call void @free(i8* [[FOO:%.*]])
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; CHECK-NEXT: ret void
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;
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call void @free(i8* %foo)
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ret void
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}
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; TODO: free call marked no-free -> %foo must be null
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define void @test15(i8* %foo) {
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; CHECK-LABEL: @test15(
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; CHECK-NEXT: call void @free(i8* [[FOO:%.*]]) #[[ATTR5:[0-9]+]]
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; CHECK-NEXT: ret void
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;
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call void @free(i8* %foo) nofree
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ret void
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}
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; TODO: freeing a nonnull nofree pointer -> full UB
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define void @test16(i8* nonnull nofree %foo) {
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; CHECK-LABEL: @test16(
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; CHECK-NEXT: call void @free(i8* [[FOO:%.*]])
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; CHECK-NEXT: ret void
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;
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call void @free(i8* %foo)
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ret void
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}
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