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llvm-6502/test/Analysis/BasicAA/gep-alias.ll
David Blaikie 198d8baafb [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 
One of several parallel first steps to remove the target type of pointers,
replacing them with a single opaque pointer type.

This adds an explicit type parameter to the gep instruction so that when the
first parameter becomes an opaque pointer type, the type to gep through is
still available to the instructions.

* This doesn't modify gep operators, only instructions (operators will be
  handled separately)

* Textual IR changes only. Bitcode (including upgrade) and changing the
  in-memory representation will be in separate changes.

* geps of vectors are transformed as:
    getelementptr <4 x float*> %x, ...
  ->getelementptr float, <4 x float*> %x, ...
  Then, once the opaque pointer type is introduced, this will ultimately look
  like:
    getelementptr float, <4 x ptr> %x
  with the unambiguous interpretation that it is a vector of pointers to float.

* address spaces remain on the pointer, not the type:
    getelementptr float addrspace(1)* %x
  ->getelementptr float, float addrspace(1)* %x
  Then, eventually:
    getelementptr float, ptr addrspace(1) %x

Importantly, the massive amount of test case churn has been automated by
same crappy python code. I had to manually update a few test cases that
wouldn't fit the script's model (r228970,r229196,r229197,r229198). The
python script just massages stdin and writes the result to stdout, I
then wrapped that in a shell script to handle replacing files, then
using the usual find+xargs to migrate all the files.

update.py:
import fileinput
import sys
import re

ibrep = re.compile(r"(^.*?[^%\w]getelementptr inbounds )(((?:<\d* x )?)(.*?)(| addrspace\(\d\)) *\*(|>)(?:$| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$))")
normrep = re.compile(       r"(^.*?[^%\w]getelementptr )(((?:<\d* x )?)(.*?)(| addrspace\(\d\)) *\*(|>)(?:$| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$))")

def conv(match, line):
  if not match:
    return line
  line = match.groups()[0]
  if len(match.groups()[5]) == 0:
    line += match.groups()[2]
  line += match.groups()[3]
  line += ", "
  line += match.groups()[1]
  line += "\n"
  return line

for line in sys.stdin:
  if line.find("getelementptr ") == line.find("getelementptr inbounds"):
    if line.find("getelementptr inbounds") != line.find("getelementptr inbounds ("):
      line = conv(re.match(ibrep, line), line)
  elif line.find("getelementptr ") != line.find("getelementptr ("):
    line = conv(re.match(normrep, line), line)
  sys.stdout.write(line)

apply.sh:
for name in "$@"
do
  python3 `dirname "$0"`/update.py < "$name" > "$name.tmp" && mv "$name.tmp" "$name"
  rm -f "$name.tmp"
done

The actual commands:
From llvm/src:
find test/ -name *.ll | xargs ./apply.sh
From llvm/src/tools/clang:
find test/ -name *.mm -o -name *.m -o -name *.cpp -o -name *.c | xargs -I '{}' ../../apply.sh "{}"
From llvm/src/tools/polly:
find test/ -name *.ll | xargs ./apply.sh

After that, check-all (with llvm, clang, clang-tools-extra, lld,
compiler-rt, and polly all checked out).

The extra 'rm' in the apply.sh script is due to a few files in clang's test
suite using interesting unicode stuff that my python script was throwing
exceptions on. None of those files needed to be migrated, so it seemed
sufficient to ignore those cases.

Reviewers: rafael, dexonsmith, grosser

Differential Revision: http://reviews.llvm.org/D7636

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230786 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-27 19:29:02 +00:00

231 lines
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; RUN: opt < %s -basicaa -gvn -instcombine -S 2>&1 | FileCheck %s
target datalayout = "e-p:32:32:32-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
; Make sure that basicaa thinks R and r are must aliases.
define i32 @test1(i8 * %P) {
entry:
%Q = bitcast i8* %P to {i32, i32}*
%R = getelementptr {i32, i32}, {i32, i32}* %Q, i32 0, i32 1
%S = load i32* %R
%q = bitcast i8* %P to {i32, i32}*
%r = getelementptr {i32, i32}, {i32, i32}* %q, i32 0, i32 1
%s = load i32* %r
%t = sub i32 %S, %s
ret i32 %t
; CHECK-LABEL: @test1(
; CHECK: ret i32 0
}
define i32 @test2(i8 * %P) {
entry:
%Q = bitcast i8* %P to {i32, i32, i32}*
%R = getelementptr {i32, i32, i32}, {i32, i32, i32}* %Q, i32 0, i32 1
%S = load i32* %R
%r = getelementptr {i32, i32, i32}, {i32, i32, i32}* %Q, i32 0, i32 2
store i32 42, i32* %r
%s = load i32* %R
%t = sub i32 %S, %s
ret i32 %t
; CHECK-LABEL: @test2(
; CHECK: ret i32 0
}
; This was a miscompilation.
define i32 @test3({float, {i32, i32, i32}}* %P) {
entry:
%P2 = getelementptr {float, {i32, i32, i32}}, {float, {i32, i32, i32}}* %P, i32 0, i32 1
%R = getelementptr {i32, i32, i32}, {i32, i32, i32}* %P2, i32 0, i32 1
%S = load i32* %R
%r = getelementptr {i32, i32, i32}, {i32, i32, i32}* %P2, i32 0, i32 2
store i32 42, i32* %r
%s = load i32* %R
%t = sub i32 %S, %s
ret i32 %t
; CHECK-LABEL: @test3(
; CHECK: ret i32 0
}
;; This is reduced from the SmallPtrSet constructor.
%SmallPtrSetImpl = type { i8**, i32, i32, i32, [1 x i8*] }
%SmallPtrSet64 = type { %SmallPtrSetImpl, [64 x i8*] }
define i32 @test4(%SmallPtrSet64* %P) {
entry:
%tmp2 = getelementptr inbounds %SmallPtrSet64, %SmallPtrSet64* %P, i64 0, i32 0, i32 1
store i32 64, i32* %tmp2, align 8
%tmp3 = getelementptr inbounds %SmallPtrSet64, %SmallPtrSet64* %P, i64 0, i32 0, i32 4, i64 64
store i8* null, i8** %tmp3, align 8
%tmp4 = load i32* %tmp2, align 8
ret i32 %tmp4
; CHECK-LABEL: @test4(
; CHECK: ret i32 64
}
; P[i] != p[i+1]
define i32 @test5(i32* %p, i64 %i) {
%pi = getelementptr i32, i32* %p, i64 %i
%i.next = add i64 %i, 1
%pi.next = getelementptr i32, i32* %p, i64 %i.next
%x = load i32* %pi
store i32 42, i32* %pi.next
%y = load i32* %pi
%z = sub i32 %x, %y
ret i32 %z
; CHECK-LABEL: @test5(
; CHECK: ret i32 0
}
define i32 @test5_as1_smaller_size(i32 addrspace(1)* %p, i8 %i) {
%pi = getelementptr i32, i32 addrspace(1)* %p, i8 %i
%i.next = add i8 %i, 1
%pi.next = getelementptr i32, i32 addrspace(1)* %p, i8 %i.next
%x = load i32 addrspace(1)* %pi
store i32 42, i32 addrspace(1)* %pi.next
%y = load i32 addrspace(1)* %pi
%z = sub i32 %x, %y
ret i32 %z
; CHECK-LABEL: @test5_as1_smaller_size(
; CHECK: sext
; CHECK: ret i32 0
}
define i32 @test5_as1_same_size(i32 addrspace(1)* %p, i16 %i) {
%pi = getelementptr i32, i32 addrspace(1)* %p, i16 %i
%i.next = add i16 %i, 1
%pi.next = getelementptr i32, i32 addrspace(1)* %p, i16 %i.next
%x = load i32 addrspace(1)* %pi
store i32 42, i32 addrspace(1)* %pi.next
%y = load i32 addrspace(1)* %pi
%z = sub i32 %x, %y
ret i32 %z
; CHECK-LABEL: @test5_as1_same_size(
; CHECK: ret i32 0
}
; P[i] != p[(i*4)|1]
define i32 @test6(i32* %p, i64 %i1) {
%i = shl i64 %i1, 2
%pi = getelementptr i32, i32* %p, i64 %i
%i.next = or i64 %i, 1
%pi.next = getelementptr i32, i32* %p, i64 %i.next
%x = load i32* %pi
store i32 42, i32* %pi.next
%y = load i32* %pi
%z = sub i32 %x, %y
ret i32 %z
; CHECK-LABEL: @test6(
; CHECK: ret i32 0
}
; P[1] != P[i*4]
define i32 @test7(i32* %p, i64 %i) {
%pi = getelementptr i32, i32* %p, i64 1
%i.next = shl i64 %i, 2
%pi.next = getelementptr i32, i32* %p, i64 %i.next
%x = load i32* %pi
store i32 42, i32* %pi.next
%y = load i32* %pi
%z = sub i32 %x, %y
ret i32 %z
; CHECK-LABEL: @test7(
; CHECK: ret i32 0
}
; P[zext(i)] != p[zext(i+1)]
; PR1143
define i32 @test8(i32* %p, i16 %i) {
%i1 = zext i16 %i to i32
%pi = getelementptr i32, i32* %p, i32 %i1
%i.next = add i16 %i, 1
%i.next2 = zext i16 %i.next to i32
%pi.next = getelementptr i32, i32* %p, i32 %i.next2
%x = load i32* %pi
store i32 42, i32* %pi.next
%y = load i32* %pi
%z = sub i32 %x, %y
ret i32 %z
; CHECK-LABEL: @test8(
; CHECK: ret i32 0
}
define i8 @test9([4 x i8] *%P, i32 %i, i32 %j) {
%i2 = shl i32 %i, 2
%i3 = add i32 %i2, 1
; P2 = P + 1 + 4*i
%P2 = getelementptr [4 x i8], [4 x i8] *%P, i32 0, i32 %i3
%j2 = shl i32 %j, 2
; P4 = P + 4*j
%P4 = getelementptr [4 x i8], [4 x i8]* %P, i32 0, i32 %j2
%x = load i8* %P2
store i8 42, i8* %P4
%y = load i8* %P2
%z = sub i8 %x, %y
ret i8 %z
; CHECK-LABEL: @test9(
; CHECK: ret i8 0
}
define i8 @test10([4 x i8] *%P, i32 %i) {
%i2 = shl i32 %i, 2
%i3 = add i32 %i2, 4
; P2 = P + 4 + 4*i
%P2 = getelementptr [4 x i8], [4 x i8] *%P, i32 0, i32 %i3
; P4 = P + 4*i
%P4 = getelementptr [4 x i8], [4 x i8]* %P, i32 0, i32 %i2
%x = load i8* %P2
store i8 42, i8* %P4
%y = load i8* %P2
%z = sub i8 %x, %y
ret i8 %z
; CHECK-LABEL: @test10(
; CHECK: ret i8 0
}
; (This was a miscompilation.)
define float @test11(i32 %indvar, [4 x [2 x float]]* %q) nounwind ssp {
%tmp = mul i32 %indvar, -1
%dec = add i32 %tmp, 3
%scevgep = getelementptr [4 x [2 x float]], [4 x [2 x float]]* %q, i32 0, i32 %dec
%scevgep35 = bitcast [2 x float]* %scevgep to i64*
%arrayidx28 = getelementptr inbounds [4 x [2 x float]], [4 x [2 x float]]* %q, i32 0, i32 0
%y29 = getelementptr inbounds [2 x float], [2 x float]* %arrayidx28, i32 0, i32 1
store float 1.0, float* %y29, align 4
store i64 0, i64* %scevgep35, align 4
%tmp30 = load float* %y29, align 4
ret float %tmp30
; CHECK-LABEL: @test11(
; CHECK: ret float %tmp30
}
; (This was a miscompilation.)
define i32 @test12(i32 %x, i32 %y, i8* %p) nounwind {
%a = bitcast i8* %p to [13 x i8]*
%b = getelementptr [13 x i8], [13 x i8]* %a, i32 %x
%c = bitcast [13 x i8]* %b to [15 x i8]*
%d = getelementptr [15 x i8], [15 x i8]* %c, i32 %y, i32 8
%castd = bitcast i8* %d to i32*
%castp = bitcast i8* %p to i32*
store i32 1, i32* %castp
store i32 0, i32* %castd
%r = load i32* %castp
ret i32 %r
; CHECK-LABEL: @test12(
; CHECK: ret i32 %r
}
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