forked from OSchip/llvm-project
67 lines
2.2 KiB
LLVM
67 lines
2.2 KiB
LLVM
; Test lib call simplification of __memset_chk calls with various values
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; for dstlen and len.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; rdar://7719085
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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"
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%struct.T = type { [100 x i32], [100 x i32], [1024 x i8] }
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@t = common global %struct.T zeroinitializer
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; Check cases where dstlen >= len.
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define i8* @test_simplify1() {
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; CHECK-LABEL: @test_simplify1(
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%dst = bitcast %struct.T* @t to i8*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* bitcast (%struct.T* @t to i8*), i8 0, i64 1824, i32 4, i1 false)
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; CHECK-NEXT: ret i8* bitcast (%struct.T* @t to i8*)
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%ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 1824)
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ret i8* %ret
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}
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define i8* @test_simplify2() {
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; CHECK-LABEL: @test_simplify2(
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%dst = bitcast %struct.T* @t to i8*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* bitcast (%struct.T* @t to i8*), i8 0, i64 1824, i32 4, i1 false)
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; CHECK-NEXT: ret i8* bitcast (%struct.T* @t to i8*)
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%ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 3648)
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ret i8* %ret
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}
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define i8* @test_simplify3() {
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; CHECK-LABEL: @test_simplify3(
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%dst = bitcast %struct.T* @t to i8*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* bitcast (%struct.T* @t to i8*), i8 0, i64 1824, i32 4, i1 false)
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; CHECK-NEXT: ret i8* bitcast (%struct.T* @t to i8*)
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%ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 -1)
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ret i8* %ret
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}
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; Check cases where dstlen < len.
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define i8* @test_no_simplify1() {
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; CHECK-LABEL: @test_no_simplify1(
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%dst = bitcast %struct.T* @t to i8*
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; CHECK-NEXT: %ret = call i8* @__memset_chk(i8* bitcast (%struct.T* @t to i8*), i32 0, i64 1824, i64 400)
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; CHECK-NEXT: ret i8* %ret
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%ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 400)
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ret i8* %ret
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}
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define i8* @test_no_simplify2() {
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; CHECK-LABEL: @test_no_simplify2(
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%dst = bitcast %struct.T* @t to i8*
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; CHECK-NEXT: %ret = call i8* @__memset_chk(i8* bitcast (%struct.T* @t to i8*), i32 0, i64 1824, i64 0)
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; CHECK-NEXT: ret i8* %ret
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%ret = call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 0)
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ret i8* %ret
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}
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declare i8* @__memset_chk(i8*, i32, i64, i64)
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