From b29de8ba0044548f0259b5eca180e07bdba992bc Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Thu, 12 Dec 2013 04:28:52 +0000
Subject: Merging r197089:
 ------------------------------------------------------------------------
 r197089 | hfinkel | 2013-12-11 15:12:25 -0800 (Wed, 11 Dec 2013) | 6 lines

Fix the PPC subsumes-predicate check

For one predicate to subsume another, they must both check the same condition
register. Failure to check this prerequisite was causing miscompiles.

Fixes PR18003.
------------------------------------------------------------------------


git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_34@197126 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/PowerPC/subsumes-pred-regs.ll | 65 ++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 test/CodeGen/PowerPC/subsumes-pred-regs.ll

(limited to 'test/CodeGen')

diff --git a/test/CodeGen/PowerPC/subsumes-pred-regs.ll b/test/CodeGen/PowerPC/subsumes-pred-regs.ll
new file mode 100644
index 0000000..97ac788
--- /dev/null
+++ b/test/CodeGen/PowerPC/subsumes-pred-regs.ll
@@ -0,0 +1,65 @@
+; RUN: llc < %s -mcpu=ppc64 | FileCheck %s
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
+target triple = "powerpc64-unknown-linux-gnu"
+
+; Function Attrs: nounwind
+define zeroext i1 @test1() unnamed_addr #0 align 2 {
+
+; CHECK-LABEL: @test1
+
+entry:
+  br i1 undef, label %lor.end, label %lor.rhs
+
+lor.rhs:                                          ; preds = %entry
+  unreachable
+
+lor.end:                                          ; preds = %entry
+  br i1 undef, label %land.rhs, label %if.then
+
+if.then:                                          ; preds = %lor.end
+  br i1 undef, label %return, label %if.end.i24
+
+if.end.i24:                                       ; preds = %if.then
+  %0 = load i32* undef, align 4
+  %lnot.i.i16.i23 = icmp eq i32 %0, 0
+  br i1 %lnot.i.i16.i23, label %if.end7.i37, label %test.exit27.i34
+
+test.exit27.i34: ; preds = %if.end.i24
+  br i1 undef, label %return, label %if.end7.i37
+
+if.end7.i37:                                      ; preds = %test.exit27.i34, %if.end.i24
+  %tobool.i.i36 = icmp eq i8 undef, 0
+  br i1 %tobool.i.i36, label %return, label %if.then9.i39
+
+if.then9.i39:                                     ; preds = %if.end7.i37
+  br i1 %lnot.i.i16.i23, label %return, label %lor.rhs.i.i49
+
+; CHECK: .LBB0_7:
+; CHECK:	beq 1, .LBB0_10
+; CHECK:	beq 0, .LBB0_10
+; CHECK: .LBB0_9:
+
+lor.rhs.i.i49:                                    ; preds = %if.then9.i39
+  %cmp.i.i.i.i48 = icmp ne i64 undef, 0
+  br label %return
+
+land.rhs:                                         ; preds = %lor.end
+  br i1 undef, label %return, label %if.end.i
+
+if.end.i:                                         ; preds = %land.rhs
+  br i1 undef, label %return, label %if.then9.i
+
+if.then9.i:                                       ; preds = %if.end.i
+  br i1 undef, label %return, label %lor.rhs.i.i
+
+lor.rhs.i.i:                                      ; preds = %if.then9.i
+  %cmp.i.i.i.i = icmp ne i64 undef, 0
+  br label %return
+
+return:                                           ; preds = %lor.rhs.i.i, %if.then9.i, %if.end.i, %land.rhs, %lor.rhs.i.i49, %if.then9.i39, %if.end7.i37, %test.exit27.i34, %if.then
+  %retval.0 = phi i1 [ false, %if.then ], [ false, %test.exit27.i34 ], [ true, %if.end7.i37 ], [ true, %if.then9.i39 ], [ %cmp.i.i.i.i48, %lor.rhs.i.i49 ], [ false, %land.rhs ], [ true, %if.end.i ], [ true, %if.then9.i ], [ %cmp.i.i.i.i, %lor.rhs.i.i ]
+  ret i1 %retval.0
+}
+
+attributes #0 = { nounwind }
+
-- 
cgit v1.1