X86FixupBWInsts: No need for forward liveness analysis.

With r274952 and r275201 in place there are no cases left where a
forward liveness analysis yields different results than a backward one.
So we can remove the forward stepping logic.

Differential Revision: http://reviews.llvm.org/D22083

llvm-svn: 275204

1 files changed, 0 insertions, 37 deletions

diff --git a/llvm/test/CodeGen/X86/fixup-bw-inst-fwlive.mir b/llvm/test/CodeGen/X86/fixup-bw-inst-fwlive.mir
deleted file mode 100644
index 8dc96bbca74..00000000000
--- a/llvm/test/CodeGen/X86/fixup-bw-inst-fwlive.mir
+++ /dev/null
@@ -1,37 +0,0 @@
-# RUN: llc -run-pass x86-fixup-bw-insts -mtriple=x86_64-- -o /dev/null %s 2>&1 | FileCheck %s
-
-# Verify that the forwards live-ness checking code in fixup-bw-inst works.
-
---- |
-  target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
-
-  define i8 @foo(i8 %p1) {
-  entry:
-    %t1 = or i8 %p1, 0
-    br label %false
-  false:
-    ret i8 %t1
-  }
-
-...
-
----
-name:            foo
-allVRegsAllocated: true
-isSSA:           false
-tracksRegLiveness: true
-liveins:
-  - { reg: '%edi' }
-body:             |
-  bb.0.entry:
-    liveins: %edi
-    successors: %bb.1.false
-    
-    %al = MOV8rr %dil, implicit %edi
-    ; CHECK: %eax = MOV32rr undef %edi, implicit %dil
-
-  bb.1.false:
-    liveins: %al, %ax, %eax, %rax
-    RETQ %al
-
-...