From 1e038a8494c9b363cd03a1e239d3a6817d7edec3 Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Tue, 15 Sep 2009 01:22:01 +0000 Subject: Don't pull a load through a callseq_start if the load's chain has multiple uses, as one of the other uses may be on a path to a different node above the callseq_start, because that leads to a cyclic graph. This problem is exposed when -combiner-global-alias-analysis is used. This fixes PR4880. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81821 91177308-0d34-0410-b5e6-96231b3b80d8 --- test/CodeGen/X86/combiner-aa-1.ll | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 test/CodeGen/X86/combiner-aa-1.ll (limited to 'test/CodeGen/X86/combiner-aa-1.ll') diff --git a/test/CodeGen/X86/combiner-aa-1.ll b/test/CodeGen/X86/combiner-aa-1.ll new file mode 100644 index 0000000000..58a7129b60 --- /dev/null +++ b/test/CodeGen/X86/combiner-aa-1.ll @@ -0,0 +1,23 @@ +; RUN: llc < %s --combiner-alias-analysis --combiner-global-alias-analysis +; PR4880 + +target datalayout = "e-p:32:32:32-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-f80:32:32" +target triple = "i386-pc-linux-gnu" + +%struct.alst_node = type { %struct.node } +%struct.arg_node = type { %struct.node, i8*, %struct.alst_node* } +%struct.arglst_node = type { %struct.alst_node, %struct.arg_node*, %struct.arglst_node* } +%struct.lam_node = type { %struct.alst_node, %struct.arg_node*, %struct.alst_node* } +%struct.node = type { i32 (...)**, %struct.node* } + +define i32 @._ZN8lam_node18resolve_name_clashEP8arg_nodeP9alst_node._ZNK8lam_nodeeqERK8exp_node._ZN11arglst_nodeD0Ev(%struct.lam_node* %this.this, %struct.arg_node* %outer_arg, %struct.alst_node* %env.cmp, %struct.arglst_node* %this, i32 %functionID) { +comb_entry: + %.SV59 = alloca %struct.node* ; <%struct.node**> [#uses=1] + %0 = load i32 (...)*** null, align 4 ; [#uses=1] + %1 = getelementptr inbounds i32 (...)** %0, i32 3 ; [#uses=1] + %2 = load i32 (...)** %1, align 4 ; [#uses=1] + store %struct.node* undef, %struct.node** %.SV59 + %3 = bitcast i32 (...)* %2 to i32 (%struct.node*)* ; [#uses=1] + %4 = tail call i32 %3(%struct.node* undef) ; [#uses=0] + unreachable +} -- cgit v1.2.3