| ; Test lib call simplification of __memset_chk calls with various values |
| ; for dstlen and len. |
| ; |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| ; rdar://7719085 |
| |
| target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" |
| |
| %struct.T = type { [100 x i32], [100 x i32], [1024 x i8] } |
| @t = common global %struct.T zeroinitializer |
| |
| ; Check cases where dstlen >= len. |
| |
| define i8* @test_simplify1() { |
| ; CHECK-LABEL: @test_simplify1( |
| %dst = bitcast %struct.T* @t to i8* |
| |
| ; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* bitcast (%struct.T* @t to i8*), i8 0, i64 1824, i32 4, i1 false) |
| ; CHECK-NEXT: ret i8* bitcast (%struct.T* @t to i8*) |
| %ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 1824) |
| ret i8* %ret |
| } |
| |
| define i8* @test_simplify2() { |
| ; CHECK-LABEL: @test_simplify2( |
| %dst = bitcast %struct.T* @t to i8* |
| |
| ; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* bitcast (%struct.T* @t to i8*), i8 0, i64 1824, i32 4, i1 false) |
| ; CHECK-NEXT: ret i8* bitcast (%struct.T* @t to i8*) |
| %ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 3648) |
| ret i8* %ret |
| } |
| |
| define i8* @test_simplify3() { |
| ; CHECK-LABEL: @test_simplify3( |
| %dst = bitcast %struct.T* @t to i8* |
| |
| ; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* bitcast (%struct.T* @t to i8*), i8 0, i64 1824, i32 4, i1 false) |
| ; CHECK-NEXT: ret i8* bitcast (%struct.T* @t to i8*) |
| %ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 -1) |
| ret i8* %ret |
| } |
| |
| ; Check cases where dstlen < len. |
| |
| define i8* @test_no_simplify1() { |
| ; CHECK-LABEL: @test_no_simplify1( |
| %dst = bitcast %struct.T* @t to i8* |
| |
| ; CHECK-NEXT: %ret = call i8* @__memset_chk(i8* bitcast (%struct.T* @t to i8*), i32 0, i64 1824, i64 400) |
| ; CHECK-NEXT: ret i8* %ret |
| %ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 400) |
| ret i8* %ret |
| } |
| |
| define i8* @test_no_simplify2() { |
| ; CHECK-LABEL: @test_no_simplify2( |
| %dst = bitcast %struct.T* @t to i8* |
| |
| ; CHECK-NEXT: %ret = call i8* @__memset_chk(i8* bitcast (%struct.T* @t to i8*), i32 0, i64 1824, i64 0) |
| ; CHECK-NEXT: ret i8* %ret |
| %ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 0) |
| ret i8* %ret |
| } |
| |
| ; Test that RAUW in SimplifyLibCalls for __memset_chk generates valid IR |
| define i32 @test_rauw(i8* %a, i8* %b, i8** %c) { |
| ; CHECK-LABEL: test_rauw |
| entry: |
| %call49 = call i64 @strlen(i8* %a) |
| %add180 = add i64 %call49, 1 |
| %yo107 = call i64 @llvm.objectsize.i64.p0i8(i8* %b, i1 false) |
| %call50 = call i8* @__memmove_chk(i8* %b, i8* %a, i64 %add180, i64 %yo107) |
| ; CHECK: %strlen = call i64 @strlen(i8* %b) |
| ; CHECK-NEXT: %strchr2 = getelementptr i8, i8* %b, i64 %strlen |
| %call51i = call i8* @strrchr(i8* %b, i32 0) |
| %d = load i8*, i8** %c, align 8 |
| %sub182 = ptrtoint i8* %d to i64 |
| %sub183 = ptrtoint i8* %b to i64 |
| %sub184 = sub i64 %sub182, %sub183 |
| %add52.i.i = add nsw i64 %sub184, 1 |
| ; CHECK: call void @llvm.memset.p0i8.i64(i8* %strchr2 |
| %call185 = call i8* @__memset_chk(i8* %call51i, i32 0, i64 %add52.i.i, i64 -1) |
| ret i32 4 |
| } |
| |
| declare i8* @__memmove_chk(i8*, i8*, i64, i64) |
| declare i8* @strrchr(i8*, i32) |
| declare i64 @strlen(i8* nocapture) |
| declare i64 @llvm.objectsize.i64.p0i8(i8*, i1) |
| |
| declare i8* @__memset_chk(i8*, i32, i64, i64) |