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final step needed to resolve PR6627, which allows us to flatten the code down to

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a nice and tidy:
  %x1 = load i32* %0, align 4
  %1 = icmp eq i32 %x1, 1179403647
  br i1 %1, label %if.then, label %if.end

instead of doing lots of loads and branches.  May the FreeBSD bootloader
long fit in its allocated space.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130416 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2011-04-28 18:15:47 +00:00
parent ad3ba6a7de
commit 0a9e3d613b
3 changed files with 78 additions and 7 deletions
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46
test/Transforms/PhaseOrdering/basic.ll
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@ -60,7 +60,7 @@ if.then: ; preds = %land.lhs.true17
%call25 = call i32 (...)* @doo()
br label %if.end
if.end: ; preds = %if.then, %land.lhs.true17, %land.lhs.true9, %land.lhs.true, %entry
if.end:
ret void
; CHECK: @test2
@ -71,3 +71,47 @@ if.end: ; preds = %if.then, %land.lhs.
declare i32 @doo(...)
; PR6627 - This should all be flattened down to one compare. This is the same
; as test2, except that the initial load is done as an i8 instead of i32, thus
; requiring widening.
define void @test2a(i8* %arrayidx) nounwind ssp {
entry:
%x1 = load i8* %arrayidx, align 4
%conv = zext i8 %x1 to i32
%cmp = icmp eq i32 %conv, 127
br i1 %cmp, label %land.lhs.true, label %if.end
land.lhs.true: ; preds = %entry
%arrayidx4 = getelementptr inbounds i8* %arrayidx, i64 1
%tmp5 = load i8* %arrayidx4, align 1
%conv6 = zext i8 %tmp5 to i32
%cmp7 = icmp eq i32 %conv6, 69
br i1 %cmp7, label %land.lhs.true9, label %if.end
land.lhs.true9: ; preds = %land.lhs.true
%arrayidx12 = getelementptr inbounds i8* %arrayidx, i64 2
%tmp13 = load i8* %arrayidx12, align 1
%conv14 = zext i8 %tmp13 to i32
%cmp15 = icmp eq i32 %conv14, 76
br i1 %cmp15, label %land.lhs.true17, label %if.end
land.lhs.true17: ; preds = %land.lhs.true9
%arrayidx20 = getelementptr inbounds i8* %arrayidx, i64 3
%tmp21 = load i8* %arrayidx20, align 1
%conv22 = zext i8 %tmp21 to i32
%cmp23 = icmp eq i32 %conv22, 70
br i1 %cmp23, label %if.then, label %if.end
if.then: ; preds = %land.lhs.true17
%call25 = call i32 (...)* @doo()
br label %if.end
if.end:
ret void
; CHECK: @test2a
; CHECK: %x1 = load i32* {{.*}}, align 4
; CHECK-NEXT: icmp eq i32 %x1, 1179403647
; CHECK-NEXT: br i1 {{.*}}, label %if.then, label %if.end
}