From fba24b3775e9f106f65c8673aff0648b3d173741 Mon Sep 17 00:00:00 2001 From: Michael Kruse Date: Wed, 12 Aug 2015 07:34:55 +0000 Subject: [PATCH] Add another test case with trival PHI in entry BB This one was extracted from the test-suite's pifft and caused a miscompilation because a scalar was not written to its alloca address. llvm-svn: 244720 --- .../Isl/CodeGen/entry_with_trivial_phi_other_bb.ll | 38 ++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 polly/test/Isl/CodeGen/entry_with_trivial_phi_other_bb.ll diff --git a/polly/test/Isl/CodeGen/entry_with_trivial_phi_other_bb.ll b/polly/test/Isl/CodeGen/entry_with_trivial_phi_other_bb.ll new file mode 100644 index 0000000..bec8ae0 --- /dev/null +++ b/polly/test/Isl/CodeGen/entry_with_trivial_phi_other_bb.ll @@ -0,0 +1,38 @@ +; RUN: opt %loadPolly -polly-detect-unprofitable -polly-no-early-exit -polly-codegen -S < %s | FileCheck %s +; +; The entry of this scop's simple region (entry.split => for.end) has an trivial +; PHI node that is used in a different of the scop region. LCSSA may create such +; PHI nodes. This is a breakdown of this case in the function 'mp_unexp_sub' of +; pifft from LLVM's test-suite. +; +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" + +define void @test(i64 %n, float* noalias nonnull %A, float %a) { +entry: + br label %entry.split + +; CHECK-LABEL: polly.start: +; CHECK: store float %a, float* %b.phiops + +entry.split: + %b = phi float [ %a, %entry ] + %cmp2 = icmp slt i64 %n, 5 + br i1 %cmp2, label %for.cond, label %for.end + +for.cond: ; preds = %for.inc, %entry + %i.0 = phi i64 [ 0, %entry.split ], [ %add, %for.inc ] + %cmp = icmp slt i64 %i.0, %n + br i1 %cmp, label %for.body, label %for.end + +for.body: ; preds = %for.cond + %arrayidx = getelementptr inbounds float, float* %A, i64 %i.0 + store float %b, float* %arrayidx, align 4 + br label %for.inc + +for.inc: ; preds = %for.body + %add = add nuw nsw i64 %i.0, 1 + br label %for.cond + +for.end: ; preds = %for.cond + ret void +} -- 2.7.4