[PATCH] D109133: [Delinerization] Require by offset to be zero.

[Michael Kruse via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG088577a38e60: [Delinerization] Require by offset to be zero. (authored by Meinersbur).

Changed prior to commit:
  https://reviews.llvm.org/D109133?vs=370167&id=371442#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D109133/new/

https://reviews.llvm.org/D109133

Files:
  llvm/lib/Analysis/Delinearization.cpp
  llvm/test/Analysis/Delinearization/byte_offset.ll


Index: llvm/test/Analysis/Delinearization/byte_offset.ll
===================================================================
--- /dev/null
+++ llvm/test/Analysis/Delinearization/byte_offset.ll
@@ -0,0 +1,39 @@
+; RUN: opt < %s -analyze -enable-new-pm=0 -delinearize | FileCheck %s
+; RUN: opt < %s -passes='print<delinearization>' -disable-output 2>&1 | FileCheck %s
+
+; CHECK: AccessFunction: ({0,+,%i2}<%outer.loop> + %unknown)
+; CHECK-NEXT: failed to delinearize
+
+; void foo(char A[], long i2, bool c) {
+;   for (long i = 0; ; ++i) {
+;     char *tmp = &A[i * i2];
+;     if (c)
+;       while (1)
+;          *((float*)&tmp[arg << arg]) = 0;
+;   }
+; }
+
+define void @foo(i8* %A, i64 %i2, i64 %arg, i1 %c) {
+entry:
+  br label %outer.loop
+
+outer.loop:
+  %outer.iv = phi i64 [ 0, %entry ], [ %outer.iv.next, %outer.latch ]
+  %i414 = mul nsw i64 %outer.iv, %i2
+  %tmp = getelementptr inbounds i8, i8* %A, i64 %i414
+  br i1 %c, label %inner.preheader, label %outer.latch
+
+inner.preheader:
+  %unknown = shl i64 %arg, %arg
+  %arrayidx = getelementptr inbounds i8, i8* %tmp, i64 %unknown
+  %ptr = bitcast i8* %arrayidx to float*
+  br label %inner.loop
+
+inner.loop:
+  store float 0.000000e+00, float* %ptr, align 4
+  br label %inner.loop
+
+outer.latch:
+  %outer.iv.next = add nuw nsw i64 %outer.iv, 1
+  br label %outer.loop
+}
Index: llvm/lib/Analysis/Delinearization.cpp
===================================================================
--- llvm/lib/Analysis/Delinearization.cpp
+++ llvm/lib/Analysis/Delinearization.cpp
@@ -373,8 +373,8 @@
     // the array.
     if (i == Last) {
 
-      // Bail out if the remainder is too complex.
-      if (isa<SCEVAddRecExpr>(R)) {
+      // Bail out if the byte offset is non-zero.
+      if (!R->isZero()) {
         Subscripts.clear();
         Sizes.clear();
         return;


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