6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-24 22:24:54 +00:00
Code Issues Projects Releases Wiki Activity

indvars -disable-iv-rewrite: handle an edge case involving identity phis.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134124 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2011-06-30 01:27:23 +00:00
parent 5244c4cc2f
commit 60ac719c85
2 changed files with 40 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
test/Transforms/IndVarSimplify/no-iv-rewrite.ll
View File

@@ -23,7 +23,7 @@ ph:
; sext should be eliminated while preserving gep inboundsness.
; CHECK-NOT: sext
; CHECK: getelementptr inbounds
; CHECK: exit
; CHECK: exit:
loop:
%i.02 = phi i32 [ 0, %ph ], [ %iinc, %loop ]
%s.01 = phi i32 [ 0, %ph ], [ %sinc, %loop ]
@@ -64,7 +64,7 @@ ph:
; CHECK: getelementptr inbounds
; %vall sext should obviously not be eliminated
; CHECK: sext
; CHECK: exit
; CHECK: exit:
loop:
%i.02 = phi i32 [ 0, %ph ], [ %iinc, %loop ]
%s.01 = phi i64 [ 0, %ph ], [ %sinc, %loop ]
@@ -108,7 +108,7 @@ ph:
; Preserve gep inboundsness, and don't factor it.
; CHECK: getelementptr inbounds i32* %ptriv, i32 1
; CHECK-NOT: add
; CHECK: exit
; CHECK: exit:
loop:
%ptriv = phi i32* [ %first, %ph ], [ %ptrpost, %loop ]
%ofs = sext i32 %idx to i64
@@ -139,7 +139,7 @@ entry:
; CHECK: phi i32
; CHECK: bitcast
; CHECK: getelementptr
; CHECK: exit
; CHECK: exit:
loop:
%iv = phi i32 [%start, %entry], [%next, %loop]
%p = phi %struct* [%base, %entry], [%pinc, %loop]
@@ -157,12 +157,13 @@ exit:
}
define void @maxvisitor(i32 %limit, i32* %base) nounwind {
entry: br label %loop
entry:
br label %loop
; CHECK: loop:
; CHECK: phi i64
; CHECK: trunc
; CHECK: exit
; CHECK: exit:
loop:
%idx = phi i32 [ 0, %entry ], [ %idx.next, %loop.inc ]
%max = phi i32 [ 0, %entry ], [ %max.next, %loop.inc ]
@@ -186,4 +187,28 @@ loop.inc:
exit:
ret void
}
}
; CHECK: loop:
; CHECK: phi i32
; CHECK-NOT: phi
; CHECK: exit:
define void @identityphi(i32 %limit) nounwind {
entry:
br label %loop
loop:
%iv = phi i32 [ 0, %entry], [ %iv.next, %control ]
br i1 undef, label %if.then, label %control
if.then:
br label %control
control:
%iv.next = phi i32 [ %iv, %loop ], [ undef, %if.then ]
%cmp = icmp slt i32 %iv.next, %limit
br i1 %cmp, label %loop, label %exit
exit:
ret void
}