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https://github.com/c64scene-ar/llvm-6502.git
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9969458b16
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
94 lines
3.1 KiB
LLVM
94 lines
3.1 KiB
LLVM
; 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: @main
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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* 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** %c_19
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tail call void @free(i8* %tmp_207)
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ret i32 0
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; CHECK-NEXT: 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 void @free(i8*)
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define i1 @foo() {
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; CHECK: @foo
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; CHECK-NEXT: ret i1 false
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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(i64, i8*)
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declare void @llvm.lifetime.end(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, i32, i1) nounwind
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declare void @llvm.memmove.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
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declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i32, i1) nounwind
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define void @test3(i8* %src) {
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; CHECK: @test3
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; CHECK-NEXT: ret void
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%a = call noalias i8* @malloc(i32 10)
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call void @llvm.lifetime.start(i64 10, i8* %a)
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call void @llvm.lifetime.end(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, i32 1, i1 false)
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call void @llvm.memmove.p0i8.p0i8.i32(i8* %a, i8* %src, i32 32, i32 1, i1 false)
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call void @llvm.memset.p0i8.i32(i8* %a, i8 5, i32 32, i32 1, 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: @test4
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; CHECK-NEXT: ret void
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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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; CHECK: @test5
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define void @test5(i8* %ptr, i8** %esc) {
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; CHECK-NEXT: call i8* @malloc
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; CHECK-NEXT: call i8* @malloc
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; CHECK-NEXT: call i8* @malloc
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; CHECK-NEXT: call i8* @malloc
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; CHECK-NEXT: call i8* @malloc
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; CHECK-NEXT: call i8* @malloc
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; CHECK-NEXT: call i8* @malloc
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; CHECK-NEXT: call void @llvm.memcpy
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; CHECK-NEXT: call void @llvm.memmove
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; CHECK-NEXT: store
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; CHECK-NEXT: call void @llvm.memcpy
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; CHECK-NEXT: call void @llvm.memmove
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; CHECK-NEXT: call void @llvm.memset
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; CHECK-NEXT: store volatile
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; CHECK-NEXT: ret
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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, i32 1, i1 false)
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call void @llvm.memmove.p0i8.p0i8.i32(i8* %ptr, i8* %b, i32 32, i32 1, 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, i32 1, i1 true)
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call void @llvm.memmove.p0i8.p0i8.i32(i8* %e, i8* %ptr, i32 32, i32 1, i1 true)
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call void @llvm.memset.p0i8.i32(i8* %f, i8 5, i32 32, i32 1, 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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