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Don't add CFG edges for redundant conditional branches.

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IR that hasn't been through SimplifyCFG can look like this:

  br i1 %b, label %r, label %r

Make sure we don't create duplicate Machine CFG edges in this case.

Fix the machine code verifier to accept conditional branches with a
single CFG edge.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162230 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-08-20 21:39:52 +00:00
parent 2c5a960b0e
commit e7fdef420d
3 changed files with 23 additions and 4 deletions
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2
test/CodeGen/ARM/constants.ll
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@@ -1,4 +1,4 @@
; RUN: llc < %s -mtriple=armv4t-unknown-linux-gnueabi -disable-cgp-branch-opts | FileCheck %s
; RUN: llc < %s -mtriple=armv4t-unknown-linux-gnueabi -disable-cgp-branch-opts -verify-machineinstrs | FileCheck %s
define i32 @f1() {
; CHECK: f1