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; 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 void @test_simplify1() {
; CHECK-LABEL: @test_simplify1(
%dst = bitcast %struct.T* @t to i8*
; CHECK-NEXT: call void @llvm.memset.p0i8.i64
call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 1824)
ret void
}
define void @test_simplify2() {
; CHECK-LABEL: @test_simplify2(
%dst = bitcast %struct.T* @t to i8*
; CHECK-NEXT: call void @llvm.memset.p0i8.i64
call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 3648)
ret void
}
define void @test_simplify3() {
; CHECK-LABEL: @test_simplify3(
%dst = bitcast %struct.T* @t to i8*
; CHECK-NEXT: call void @llvm.memset.p0i8.i64
call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 -1)
ret void
}
; Check cases where dstlen < len.
define void @test_no_simplify1() {
; CHECK-LABEL: @test_no_simplify1(
%dst = bitcast %struct.T* @t to i8*
; CHECK-NEXT: call i8* @__memset_chk
call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 400)
ret void
}
define void @test_no_simplify2() {
; CHECK-LABEL: @test_no_simplify2(
%dst = bitcast %struct.T* @t to i8*
; CHECK-NEXT: call i8* @__memset_chk
call i8* @__memset_chk(i8* %dst, i32 0, i64 1824, i64 0)
ret void
}
declare i8* @__memset_chk(i8*, i32, i64, i64)
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