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teak-llvm/llvm/test/CodeGen/ARM/memfunc.ll
James Y Knight ac03dca412 Stop increasing alignment of externally-visible globals on ELF 
platforms.

With ELF, the alignment of a global variable in a shared library will
get copied into an executables linked against it, if the executable even
accesss the variable. So, it's not possible to implicitly increase
alignment based on access patterns, or you'll break existing binaries.

This happened to affect libc++'s std::cout symbol, for example. See
thread: http://thread.gmane.org/gmane.comp.compilers.clang.devel/45311

(This is a re-commit of r257719, without the bug reported in
PR26144. I've tweaked the code to not assert-fail in
enforceKnownAlignment when computeKnownBits doesn't recurse far enough
to find the underlying Alloca/GlobalObject value.)

Differential Revision: http://reviews.llvm.org/D16145

llvm-svn: 257902
2016-01-15 16:33:06 +00:00

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; RUN: llc < %s -mtriple=armv7-apple-ios -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-IOS --check-prefix=CHECK
; RUN: llc < %s -mtriple=thumbv7m-none-macho -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-DARWIN --check-prefix=CHECK
; RUN: llc < %s -mtriple=arm-none-eabi -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI --check-prefix=CHECK
; RUN: llc < %s -mtriple=arm-none-eabihf -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI --check-prefix=CHECK
; RUN: llc < %s -mtriple=arm-none-androideabi -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-EABI --check-prefix=CHECK
; RUN: llc < %s -mtriple=arm-none-gnueabi -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI --check-prefix=CHECK
; RUN: llc < %s -mtriple=arm-none-gnueabihf -disable-post-ra -o - | FileCheck %s --check-prefix=CHECK-GNUEABI --check-prefix=CHECK
define void @f1(i8* %dest, i8* %src) {
entry:
; CHECK-LABEL: f1
; CHECK-IOS: bl _memmove
; CHECK-DARWIN: bl _memmove
; CHECK-EABI: bl __aeabi_memmove
; CHECK-GNUEABI: bl memmove
call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 500, i32 0, i1 false)
; CHECK-IOS: bl _memcpy
; CHECK-DARWIN: bl _memcpy
; CHECK-EABI: bl __aeabi_memcpy
; CHECK-GNUEABI: bl memcpy
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 500, i32 0, i1 false)
; EABI memset swaps arguments
; CHECK-IOS: mov r1, #1
; CHECK-IOS: bl _memset
; CHECK-DARWIN: movs r1, #1
; CHECK-DARWIN: bl _memset
; CHECK-EABI: mov r2, #1
; CHECK-EABI: bl __aeabi_memset
; CHECK-GNUEABI: mov r1, #1
; CHECK-GNUEABI: bl memset
call void @llvm.memset.p0i8.i32(i8* %dest, i8 1, i32 500, i32 0, i1 false)
; EABI uses memclr if value set to 0
; CHECK-IOS: mov r1, #0
; CHECK-IOS: bl _memset
; CHECK-DARWIN: movs r1, #0
; CHECK-DARWIN: bl _memset
; CHECK-EABI: bl __aeabi_memclr
; CHECK-GNUEABI: bl memset
call void @llvm.memset.p0i8.i32(i8* %dest, i8 0, i32 500, i32 0, i1 false)
; EABI uses aligned function variants if possible
; CHECK-IOS: bl _memmove
; CHECK-DARWIN: bl _memmove
; CHECK-EABI: bl __aeabi_memmove4
; CHECK-GNUEABI: bl memmove
call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 500, i32 4, i1 false)
; CHECK-IOS: bl _memcpy
; CHECK-DARWIN: bl _memcpy
; CHECK-EABI: bl __aeabi_memcpy4
; CHECK-GNUEABI: bl memcpy
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 500, i32 4, i1 false)
; CHECK-IOS: bl _memset
; CHECK-DARWIN: bl _memset
; CHECK-EABI: bl __aeabi_memset4
; CHECK-GNUEABI: bl memset
call void @llvm.memset.p0i8.i32(i8* %dest, i8 1, i32 500, i32 4, i1 false)
; CHECK-IOS: bl _memset
; CHECK-DARWIN: bl _memset
; CHECK-EABI: bl __aeabi_memclr4
; CHECK-GNUEABI: bl memset
call void @llvm.memset.p0i8.i32(i8* %dest, i8 0, i32 500, i32 4, i1 false)
; CHECK-IOS: bl _memmove
; CHECK-DARWIN: bl _memmove
; CHECK-EABI: bl __aeabi_memmove8
; CHECK-GNUEABI: bl memmove
call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 500, i32 8, i1 false)
; CHECK-IOS: bl _memcpy
; CHECK-DARWIN: bl _memcpy
; CHECK-EABI: bl __aeabi_memcpy8
; CHECK-GNUEABI: bl memcpy
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 500, i32 8, i1 false)
; CHECK-IOS: bl _memset
; CHECK-DARWIN: bl _memset
; CHECK-EABI: bl __aeabi_memset8
; CHECK-GNUEABI: bl memset
call void @llvm.memset.p0i8.i32(i8* %dest, i8 1, i32 500, i32 8, i1 false)
; CHECK-IOS: bl _memset
; CHECK-DARWIN: bl _memset
; CHECK-EABI: bl __aeabi_memclr8
; CHECK-GNUEABI: bl memset
call void @llvm.memset.p0i8.i32(i8* %dest, i8 0, i32 500, i32 8, i1 false)
unreachable
}
; Check that alloca arguments to memory intrinsics are automatically aligned if at least 8 bytes in size
define void @f2(i8* %dest, i32 %n) {
entry:
; CHECK-LABEL: f2
; IOS (ARMv7) should 8-byte align, others should 4-byte align
; CHECK-IOS: add r1, sp, #32
; CHECK-IOS: bl _memmove
; CHECK-DARWIN: add r1, sp, #28
; CHECK-DARWIN: bl _memmove
; CHECK-EABI: add r1, sp, #28
; CHECK-EABI: bl __aeabi_memmove
; CHECK-GNUEABI: add r1, sp, #28
; CHECK-GNUEABI: bl memmove
%arr0 = alloca [9 x i8], align 1
%0 = bitcast [9 x i8]* %arr0 to i8*
call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %0, i32 %n, i32 0, i1 false)
; CHECK: add r1, sp, #16
; CHECK-IOS: bl _memcpy
; CHECK-DARWIN: bl _memcpy
; CHECK-EABI: bl __aeabi_memcpy
; CHECK-GNUEABI: bl memcpy
%arr1 = alloca [9 x i8], align 1
%1 = bitcast [9 x i8]* %arr1 to i8*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %1, i32 %n, i32 0, i1 false)
; CHECK-IOS: mov r0, sp
; CHECK-IOS: mov r1, #1
; CHECK-IOS: bl _memset
; CHECK-DARWIN: add r0, sp, #4
; CHECK-DARWIN: movs r1, #1
; CHECK-DARWIN: bl _memset
; CHECK-EABI: add r0, sp, #4
; CHECK-EABI: mov r2, #1
; CHECK-EABI: bl __aeabi_memset
; CHECK-GNUEABI: add r0, sp, #4
; CHECK-GNUEABI: mov r1, #1
; CHECK-GNUEABI: bl memset
%arr2 = alloca [9 x i8], align 1
%2 = bitcast [9 x i8]* %arr2 to i8*
call void @llvm.memset.p0i8.i32(i8* %2, i8 1, i32 %n, i32 0, i1 false)
unreachable
}
; Check that alloca arguments are not aligned if less than 8 bytes in size
define void @f3(i8* %dest, i32 %n) {
entry:
; CHECK-LABEL: f3
; CHECK: {{add(.w)? r1, sp, #17|sub(.w)? r1, r7, #15}}
; CHECK-IOS: bl _memmove
; CHECK-DARWIN: bl _memmove
; CHECK-EABI: bl __aeabi_memmove
; CHECK-GNUEABI: bl memmove
%arr0 = alloca [7 x i8], align 1
%0 = bitcast [7 x i8]* %arr0 to i8*
call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %0, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r1, sp, #10}}
; CHECK-IOS: bl _memcpy
; CHECK-DARWIN: bl _memcpy
; CHECK-EABI: bl __aeabi_memcpy
; CHECK-GNUEABI: bl memcpy
%arr1 = alloca [7 x i8], align 1
%1 = bitcast [7 x i8]* %arr1 to i8*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %1, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r0, sp, #3}}
; CHECK-IOS: mov r1, #1
; CHECK-IOS: bl _memset
; CHECK-DARWIN: movs r1, #1
; CHECK-DARWIN: bl _memset
; CHECK-EABI: mov r2, #1
; CHECK-EABI: bl __aeabi_memset
; CHECK-GNUEABI: mov r1, #1
; CHECK-GNUEABI: bl memset
%arr2 = alloca [7 x i8], align 1
%2 = bitcast [7 x i8]* %arr2 to i8*
call void @llvm.memset.p0i8.i32(i8* %2, i8 1, i32 %n, i32 0, i1 false)
unreachable
}
; Check that alloca arguments are not aligned if size+offset is less than 8 bytes
define void @f4(i8* %dest, i32 %n) {
entry:
; CHECK-LABEL: f4
; CHECK: {{add(.w)? r., sp, #23|sub(.w)? r., r7, #17}}
; CHECK-IOS: bl _memmove
; CHECK-DARWIN: bl _memmove
; CHECK-EABI: bl __aeabi_memmove
; CHECK-GNUEABI: bl memmove
%arr0 = alloca [9 x i8], align 1
%0 = getelementptr inbounds [9 x i8], [9 x i8]* %arr0, i32 0, i32 4
call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %0, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r., sp, #(10|14)}}
; CHECK-IOS: bl _memcpy
; CHECK-DARWIN: bl _memcpy
; CHECK-EABI: bl __aeabi_memcpy
; CHECK-GNUEABI: bl memcpy
%arr1 = alloca [9 x i8], align 1
%1 = getelementptr inbounds [9 x i8], [9 x i8]* %arr1, i32 0, i32 4
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %1, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r., sp, #(1|5)}}
; CHECK-IOS: mov r1, #1
; CHECK-IOS: bl _memset
; CHECK-DARWIN: movs r1, #1
; CHECK-DARWIN: bl _memset
; CHECK-EABI: mov r2, #1
; CHECK-EABI: bl __aeabi_memset
; CHECK-GNUEABI: mov r1, #1
; CHECK-GNUEABI: bl memset
%arr2 = alloca [9 x i8], align 1
%2 = getelementptr inbounds [9 x i8], [9 x i8]* %arr2, i32 0, i32 4
call void @llvm.memset.p0i8.i32(i8* %2, i8 1, i32 %n, i32 0, i1 false)
unreachable
}
; Check that alloca arguments are not aligned if the offset is not a multiple of 4
define void @f5(i8* %dest, i32 %n) {
entry:
; CHECK-LABEL: f5
; CHECK: {{add(.w)? r., sp, #27|sub(.w)? r., r7, #21}}
; CHECK-IOS: bl _memmove
; CHECK-DARWIN: bl _memmove
; CHECK-EABI: bl __aeabi_memmove
; CHECK-GNUEABI: bl memmove
%arr0 = alloca [13 x i8], align 1
%0 = getelementptr inbounds [13 x i8], [13 x i8]* %arr0, i32 0, i32 1
call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %0, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r., sp, #(10|14)}}
; CHECK-IOS: bl _memcpy
; CHECK-DARWIN: bl _memcpy
; CHECK-EABI: bl __aeabi_memcpy
; CHECK-GNUEABI: bl memcpy
%arr1 = alloca [13 x i8], align 1
%1 = getelementptr inbounds [13 x i8], [13 x i8]* %arr1, i32 0, i32 1
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %1, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r., sp, #(1|5)}}
; CHECK-IOS: mov r1, #1
; CHECK-IOS: bl _memset
; CHECK-DARWIN: movs r1, #1
; CHECK-DARWIN: bl _memset
; CHECK-EABI: mov r2, #1
; CHECK-EABI: bl __aeabi_memset
; CHECK-GNUEABI: mov r1, #1
; CHECK-GNUEABI: bl memset
%arr2 = alloca [13 x i8], align 1
%2 = getelementptr inbounds [13 x i8], [13 x i8]* %arr2, i32 0, i32 1
call void @llvm.memset.p0i8.i32(i8* %2, i8 1, i32 %n, i32 0, i1 false)
unreachable
}
; Check that alloca arguments are not aligned if the offset is unknown
define void @f6(i8* %dest, i32 %n, i32 %i) {
entry:
; CHECK-LABEL: f6
; CHECK: {{add(.w)? r., sp, #27|sub(.w)? r., r7, #25}}
; CHECK-IOS: bl _memmove
; CHECK-DARWIN: bl _memmove
; CHECK-EABI: bl __aeabi_memmove
; CHECK-GNUEABI: bl memmove
%arr0 = alloca [13 x i8], align 1
%0 = getelementptr inbounds [13 x i8], [13 x i8]* %arr0, i32 0, i32 %i
call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %0, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r., sp, #(10|14)}}
; CHECK-IOS: bl _memcpy
; CHECK-DARWIN: bl _memcpy
; CHECK-EABI: bl __aeabi_memcpy
; CHECK-GNUEABI: bl memcpy
%arr1 = alloca [13 x i8], align 1
%1 = getelementptr inbounds [13 x i8], [13 x i8]* %arr1, i32 0, i32 %i
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %1, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r., sp, #(1|5)}}
; CHECK-IOS: mov r1, #1
; CHECK-IOS: bl _memset
; CHECK-DARWIN: movs r1, #1
; CHECK-DARWIN: bl _memset
; CHECK-EABI: mov r2, #1
; CHECK-EABI: bl __aeabi_memset
; CHECK-GNUEABI: mov r1, #1
; CHECK-GNUEABI: bl memset
%arr2 = alloca [13 x i8], align 1
%2 = getelementptr inbounds [13 x i8], [13 x i8]* %arr2, i32 0, i32 %i
call void @llvm.memset.p0i8.i32(i8* %2, i8 1, i32 %n, i32 0, i1 false)
unreachable
}
; Check that alloca arguments are not aligned if the GEP is not inbounds
define void @f7(i8* %dest, i32 %n) {
entry:
; CHECK-LABEL: f7
; CHECK: {{add(.w)? r., sp, #27|sub(.w)? r., r7, #21}}
; CHECK-IOS: bl _memmove
; CHECK-DARWIN: bl _memmove
; CHECK-EABI: bl __aeabi_memmove
; CHECK-GNUEABI: bl memmove
%arr0 = alloca [13 x i8], align 1
%0 = getelementptr [13 x i8], [13 x i8]* %arr0, i32 0, i32 4
call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %0, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r., sp, #(10|14)}}
; CHECK-IOS: bl _memcpy
; CHECK-DARWIN: bl _memcpy
; CHECK-EABI: bl __aeabi_memcpy
; CHECK-GNUEABI: bl memcpy
%arr1 = alloca [13 x i8], align 1
%1 = getelementptr [13 x i8], [13 x i8]* %arr1, i32 0, i32 4
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %1, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r., sp, #(1|5)}}
; CHECK-IOS: mov r1, #1
; CHECK-IOS: bl _memset
; CHECK-DARWIN: movs r1, #1
; CHECK-DARWIN: bl _memset
; CHECK-EABI: mov r2, #1
; CHECK-EABI: bl __aeabi_memset
; CHECK-GNUEABI: mov r1, #1
; CHECK-GNUEABI: bl memset
%arr2 = alloca [13 x i8], align 1
%2 = getelementptr [13 x i8], [13 x i8]* %arr2, i32 0, i32 4
call void @llvm.memset.p0i8.i32(i8* %2, i8 1, i32 %n, i32 0, i1 false)
unreachable
}
; Check that alloca arguments are not aligned when the offset is past the end of the allocation
define void @f8(i8* %dest, i32 %n) {
entry:
; CHECK-LABEL: f8
; CHECK: {{add(.w)? r., sp, #27|sub(.w)? r., r7, #21}}
; CHECK-IOS: bl _memmove
; CHECK-DARWIN: bl _memmove
; CHECK-EABI: bl __aeabi_memmove
; CHECK-GNUEABI: bl memmove
%arr0 = alloca [13 x i8], align 1
%0 = getelementptr inbounds [13 x i8], [13 x i8]* %arr0, i32 0, i32 16
call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %0, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r., sp, #(10|14)}}
; CHECK-IOS: bl _memcpy
; CHECK-DARWIN: bl _memcpy
; CHECK-EABI: bl __aeabi_memcpy
; CHECK-GNUEABI: bl memcpy
%arr1 = alloca [13 x i8], align 1
%1 = getelementptr inbounds [13 x i8], [13 x i8]* %arr1, i32 0, i32 16
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %1, i32 %n, i32 0, i1 false)
; CHECK: {{add(.w)? r., sp, #(1|5)}}
; CHECK-IOS: mov r1, #1
; CHECK-IOS: bl _memset
; CHECK-DARWIN: movs r1, #1
; CHECK-DARWIN: bl _memset
; CHECK-EABI: mov r2, #1
; CHECK-EABI: bl __aeabi_memset
; CHECK-GNUEABI: mov r1, #1
; CHECK-GNUEABI: bl memset
%arr2 = alloca [13 x i8], align 1
%2 = getelementptr inbounds [13 x i8], [13 x i8]* %arr2, i32 0, i32 16
call void @llvm.memset.p0i8.i32(i8* %2, i8 1, i32 %n, i32 0, i1 false)
unreachable
}
; Check that global variables are aligned if they are large enough, but only if
; they are defined in this object and don't have an explicit section.
@arr1 = global [7 x i8] c"\01\02\03\04\05\06\07", align 1
@arr2 = global [8 x i8] c"\01\02\03\04\05\06\07\08", align 1
@arr3 = global [7 x i8] c"\01\02\03\04\05\06\07", section "foo,bar", align 1
@arr4 = global [8 x i8] c"\01\02\03\04\05\06\07\08", section "foo,bar", align 1
@arr5 = weak global [7 x i8] c"\01\02\03\04\05\06\07", align 1
@arr6 = weak_odr global [7 x i8] c"\01\02\03\04\05\06\07", align 1
@arr7 = external global [7 x i8], align 1
define void @f9(i8* %dest, i32 %n) {
entry:
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @arr1, i32 0, i32 0), i32 %n, i32 1, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([8 x i8], [8 x i8]* @arr2, i32 0, i32 0), i32 %n, i32 1, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @arr3, i32 0, i32 0), i32 %n, i32 1, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([8 x i8], [8 x i8]* @arr4, i32 0, i32 0), i32 %n, i32 1, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @arr5, i32 0, i32 0), i32 %n, i32 1, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @arr6, i32 0, i32 0), i32 %n, i32 1, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @arr7, i32 0, i32 0), i32 %n, i32 1, i1 false)
unreachable
}
; CHECK: {{\.data|\.section.+data}}
; CHECK-NOT: .align
; CHECK: arr1:
; CHECK-IOS: .align 3
; CHECK-DARWIN: .align 2
; CHECK-EABI-NOT: .align
; CHECK-GNUEABI-NOT: .align
; CHECK: arr2:
; CHECK: {{\.section.+foo,bar}}
; CHECK-NOT: .align
; CHECK: arr3:
; CHECK-NOT: .align
; CHECK: arr4:
; CHECK: {{\.data|\.section.+data}}
; CHECK-NOT: .align
; CHECK: arr5:
; CHECK-NOT: .align
; CHECK: arr6:
; CHECK-NOT: arr7:
declare void @llvm.memmove.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind
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