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llvm-project/llvm/test/Transforms/InstCombine/memcpy.ll

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Slightly generalize transformation of memmove(a,a,n) so that it also applies to memcpy. (Such a memcpy is technically illegal, but in practice is safe and is generated by struct self-assignment in C code.) llvm-svn: 91621
2009-12-18 05:07:31 +08:00
; RUN: opt < %s -instcombine -S | FileCheck %s
upgrade this test. llvm-svn: 115295
2010-10-01 13:47:16 +08:00
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
fix infinite loop in instcombine with more than 4GB memcpy - memcpy size is wrongly truncated into 32-bit and treat 8GB memcpy is 0-sized memcpy - as 0-sized memcpy/memset is already removed before SimplifyMemTransfer and SimplifyMemSet in visitCallInst, replace 0 checking with assertions. - replace getZExtValue() with getLimitedValue() according to Eli Friedman llvm-svn: 161923
2012-08-15 11:49:59 +08:00
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
Slightly generalize transformation of memmove(a,a,n) so that it also applies to memcpy. (Such a memcpy is technically illegal, but in practice is safe and is generated by struct self-assignment in C code.) llvm-svn: 91621
2009-12-18 05:07:31 +08:00
fix PR8267 - Instcombine shouldn't optimizer away volatile memcpy's. llvm-svn: 115296
2010-10-01 13:51:02 +08:00
define void @test1(i8* %a) {
upgrade this test. llvm-svn: 115295
2010-10-01 13:47:16 +08:00
tail call void @llvm.memcpy.p0i8.p0i8.i32(i8* %a, i8* %a, i32 100, i32 1, i1 false)
Slightly generalize transformation of memmove(a,a,n) so that it also applies to memcpy. (Such a memcpy is technically illegal, but in practice is safe and is generated by struct self-assignment in C code.) llvm-svn: 91621
2009-12-18 05:07:31 +08:00
ret void
fix PR8267 - Instcombine shouldn't optimizer away volatile memcpy's. llvm-svn: 115296
2010-10-01 13:51:02 +08:00
; CHECK: define void @test1
Slightly generalize transformation of memmove(a,a,n) so that it also applies to memcpy. (Such a memcpy is technically illegal, but in practice is safe and is generated by struct self-assignment in C code.) llvm-svn: 91621
2009-12-18 05:07:31 +08:00
; CHECK-NEXT: ret void
fix PR8267 - Instcombine shouldn't optimizer away volatile memcpy's. llvm-svn: 115296
2010-10-01 13:51:02 +08:00
}
; PR8267
define void @test2(i8* %a) {
tail call void @llvm.memcpy.p0i8.p0i8.i32(i8* %a, i8* %a, i32 100, i32 1, i1 true)
ret void
; CHECK: define void @test2
; CHECK-NEXT: call void @llvm.memcpy
}
fix infinite loop in instcombine with more than 4GB memcpy - memcpy size is wrongly truncated into 32-bit and treat 8GB memcpy is 0-sized memcpy - as 0-sized memcpy/memset is already removed before SimplifyMemTransfer and SimplifyMemSet in visitCallInst, replace 0 checking with assertions. - replace getZExtValue() with getLimitedValue() according to Eli Friedman llvm-svn: 161923
2012-08-15 11:49:59 +08:00
define void @test3(i8* %d, i8* %s) {
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %d, i8* %s, i64 17179869184, i32 4, i1 false)
ret void
; CHECK: define void @test3
; CHECK-NEXT: call void @llvm.memcpy
}