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llvm-6502/test/Transforms/InstCombine/alloca.ll
David Blaikie 32b845d223 [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 
See r230786 and r230794 for similar changes to gep and load
respectively.

Call is a bit different because it often doesn't have a single explicit
type - usually the type is deduced from the arguments, and just the
return type is explicit. In those cases there's no need to change the
IR.

When that's not the case, the IR usually contains the pointer type of
the first operand - but since typed pointers are going away, that
representation is insufficient so I'm just stripping the "pointerness"
of the explicit type away.

This does make the IR a bit weird - it /sort of/ reads like the type of
the first operand: "call void () %x(" but %x is actually of type "void
()*" and will eventually be just of type "ptr". But this seems not too
bad and I don't think it would benefit from repeating the type
("void (), void () * %x(" and then eventually "void (), ptr %x(") as has
been done with gep and load.

This also has a side benefit: since the explicit type is no longer a
pointer, there's no ambiguity between an explicit type and a function
that returns a function pointer. Previously this case needed an explicit
type (eg: a function returning a void() function was written as
"call void () () * @x(" rather than "call void () * @x(" because of the
ambiguity between a function returning a pointer to a void() function
and a function returning void).

No ambiguity means even function pointer return types can just be
written alone, without writing the whole function's type.

This leaves /only/ the varargs case where the explicit type is required.

Given the special type syntax in call instructions, the regex-fu used
for migration was a bit more involved in its own unique way (as every
one of these is) so here it is. Use it in conjunction with the apply.sh
script and associated find/xargs commands I've provided in rr230786 to
migrate your out of tree tests. Do let me know if any of this doesn't
cover your cases & we can iterate on a more general script/regexes to
help others with out of tree tests.

About 9 test cases couldn't be automatically migrated - half of those
were functions returning function pointers, where I just had to manually
delete the function argument types now that we didn't need an explicit
function type there. The other half were typedefs of function types used
in calls - just had to manually drop the * from those.

import fileinput
import sys
import re

pat = re.compile(r'((?:=|:|^|\s)call\s(?:[^@]*?))(\s*$|\s*(?:(?:\[\[[a-zA-Z0-9_]+\]\]|[@%](?:(")?[\\\?@a-zA-Z0-9_.]*?(?(3)"|)|{{.*}}))(?:\(|$)|undef|inttoptr|bitcast|null|asm).*$)')
addrspace_end = re.compile(r"addrspace\(\d+\)\s*\*$")
func_end = re.compile("(?:void.*|\)\s*)\*$")

def conv(match, line):
  if not match or re.search(addrspace_end, match.group(1)) or not re.search(func_end, match.group(1)):
    return line
  return line[:match.start()] + match.group(1)[:match.group(1).rfind('*')].rstrip() + match.group(2) + line[match.end():]

for line in sys.stdin:
  sys.stdout.write(conv(re.search(pat, line), line))

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235145 91177308-0d34-0410-b5e6-96231b3b80d8
2015-04-16 23:24:18 +00:00

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; RUN: opt < %s -instcombine -S -default-data-layout="E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128" | FileCheck %s -check-prefix=CHECK -check-prefix=ALL
; RUN: opt < %s -instcombine -S -default-data-layout="E-p:32:32:32-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128" | FileCheck %s -check-prefix=P32 -check-prefix=ALL
; RUN: opt < %s -instcombine -S | FileCheck %s -check-prefix=NODL -check-prefix=ALL
declare void @use(...)
@int = global i32 zeroinitializer
; Zero byte allocas should be merged if they can't be deleted.
; CHECK-LABEL: @test(
; CHECK: alloca
; CHECK-NOT: alloca
define void @test() {
%X = alloca [0 x i32] ; <[0 x i32]*> [#uses=1]
call void (...) @use( [0 x i32]* %X )
%Y = alloca i32, i32 0 ; <i32*> [#uses=1]
call void (...) @use( i32* %Y )
%Z = alloca { } ; <{ }*> [#uses=1]
call void (...) @use( { }* %Z )
%size = load i32, i32* @int
%A = alloca {{}}, i32 %size
call void (...) @use( {{}}* %A )
ret void
}
; Zero byte allocas should be deleted.
; CHECK-LABEL: @test2(
; CHECK-NOT: alloca
define void @test2() {
%A = alloca i32 ; <i32*> [#uses=1]
store i32 123, i32* %A
ret void
}
; Zero byte allocas should be deleted.
; CHECK-LABEL: @test3(
; CHECK-NOT: alloca
define void @test3() {
%A = alloca { i32 } ; <{ i32 }*> [#uses=1]
%B = getelementptr { i32 }, { i32 }* %A, i32 0, i32 0 ; <i32*> [#uses=1]
store i32 123, i32* %B
ret void
}
; CHECK-LABEL: @test4(
; CHECK: = zext i32 %n to i64
; CHECK: %A = alloca i32, i64 %
define i32* @test4(i32 %n) {
%A = alloca i32, i32 %n
ret i32* %A
}
; Allocas which are only used by GEPs, bitcasts, and stores (transitively)
; should be deleted.
define void @test5() {
; CHECK-LABEL: @test5(
; CHECK-NOT: alloca
; CHECK-NOT: store
; CHECK: ret
entry:
%a = alloca { i32 }
%b = alloca i32*
%a.1 = getelementptr { i32 }, { i32 }* %a, i32 0, i32 0
store i32 123, i32* %a.1
store i32* %a.1, i32** %b
%b.1 = bitcast i32** %b to i32*
store i32 123, i32* %b.1
%a.2 = getelementptr { i32 }, { i32 }* %a, i32 0, i32 0
store atomic i32 2, i32* %a.2 unordered, align 4
%a.3 = getelementptr { i32 }, { i32 }* %a, i32 0, i32 0
store atomic i32 3, i32* %a.3 release, align 4
%a.4 = getelementptr { i32 }, { i32 }* %a, i32 0, i32 0
store atomic i32 4, i32* %a.4 seq_cst, align 4
ret void
}
declare void @f(i32* %p)
; Check that we don't delete allocas in some erroneous cases.
define void @test6() {
; CHECK-LABEL: @test6(
; CHECK-NOT: ret
; CHECK: alloca
; CHECK-NEXT: alloca
; CHECK: ret
entry:
%a = alloca { i32 }
%b = alloca i32
%a.1 = getelementptr { i32 }, { i32 }* %a, i32 0, i32 0
store volatile i32 123, i32* %a.1
tail call void @f(i32* %b)
ret void
}
; PR14371
%opaque_type = type opaque
%real_type = type { { i32, i32* } }
@opaque_global = external constant %opaque_type, align 4
define void @test7() {
entry:
%0 = alloca %real_type, align 4
%1 = bitcast %real_type* %0 to i8*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %1, i8* bitcast (%opaque_type* @opaque_global to i8*), i32 8, i32 1, i1 false)
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
; Check that the GEP indices use the pointer size, or 64 if unknown
define void @test8() {
; CHECK-LABEL: @test8(
; CHECK: alloca [100 x i32]
; CHECK: getelementptr inbounds [100 x i32], [100 x i32]* %x1, i64 0, i64 0
; P32-LABEL: @test8(
; P32: alloca [100 x i32]
; P32: getelementptr inbounds [100 x i32], [100 x i32]* %x1, i32 0, i32 0
; NODL-LABEL: @test8(
; NODL: alloca [100 x i32]
; NODL: getelementptr inbounds [100 x i32], [100 x i32]* %x1, i64 0, i64 0
%x = alloca i32, i32 100
call void (...) @use(i32* %x)
ret void
}
; PR19569
%struct_type = type { i32, i32 }
declare void @test9_aux(<{ %struct_type }>* inalloca)
declare i8* @llvm.stacksave()
declare void @llvm.stackrestore(i8*)
define void @test9(%struct_type* %a) {
; CHECK-LABEL: @test9(
entry:
%inalloca.save = call i8* @llvm.stacksave()
%argmem = alloca inalloca <{ %struct_type }>
; CHECK: alloca inalloca i64, align 8
%0 = getelementptr inbounds <{ %struct_type }>, <{ %struct_type }>* %argmem, i32 0, i32 0
%1 = bitcast %struct_type* %0 to i8*
%2 = bitcast %struct_type* %a to i8*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %1, i8* %2, i32 8, i32 4, i1 false)
call void @test9_aux(<{ %struct_type }>* inalloca %argmem)
call void @llvm.stackrestore(i8* %inalloca.save)
ret void
}
define void @test10() {
entry:
; ALL-LABEL: @test10(
; ALL: %v32 = alloca i1, align 8
; ALL: %v64 = alloca i1, align 8
; ALL: %v33 = alloca i1, align 8
%v32 = alloca i1, align 8
%v64 = alloca i1, i64 1, align 8
%v33 = alloca i1, i33 1, align 8
call void (...) @use(i1* %v32, i1* %v64, i1* %v33)
ret void
}
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