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instcombine: Add more test cases for __memset_chk simplification

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164796 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge 2012-09-27 21:21:18 +00:00
parent 5cf178f281
commit 910c564d3b
3 changed files with 81 additions and 18 deletions
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61
test/Transforms/InstCombine/memset_chk-1.ll Normal file
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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: @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: @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: @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: @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: @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)

20
test/Transforms/InstCombine/memset_chk-2.ll Normal file
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; Test that lib call simplification doesn't simplify __memset_chk calls
; with the wrong prototype.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
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
define void @test_no_simplify() {
; CHECK: @test_no_simplify
%dst = bitcast %struct.T* @t to i8*
; CHECK-NEXT: call i8* @__memset_chk
call i8* @__memset_chk(i8* %dst, i32 0, i64 1824)
ret void
}
declare i8* @__memset_chk(i8*, i32, i64)

18
test/Transforms/InstCombine/memset_chk.ll
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@ -1,18 +0,0 @@
; 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.data = type { [100 x i32], [100 x i32], [1024 x i8] }
define i32 @t() nounwind ssp {
; CHECK: @t
; CHECK: @llvm.memset.p0i8.i64
entry:
%0 = alloca %struct.data, align 8 ; <%struct.data*> [#uses=1]
%1 = bitcast %struct.data* %0 to i8* ; <i8*> [#uses=1]
%2 = call i8* @__memset_chk(i8* %1, i32 0, i64 1824, i64 1824) nounwind ; <i8*> [#uses=0]
ret i32 0
}
declare i8* @__memset_chk(i8*, i32, i64, i64) nounwind