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llvm-mirror/test/Transforms/LoopRotate/phi-duplicate.ll
Dan Gohman e26025ddd0 When rotating loops, put the original header at the bottom of the
loop, making the resulting loop significantly less ugly.  Also, zap
its trivial PHI nodes, since it's easy.

llvm-svn: 111255
2010-08-17 17:39:21 +00:00

48 lines
1.9 KiB
LLVM

; RUN: opt -S %s -loop-rotate | 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-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.0"
; PR5837
define void @test(i32 %N, double* %G) nounwind ssp {
entry:
br label %for.cond
for.cond: ; preds = %for.body, %entry
%j.0 = phi i64 [ 1, %entry ], [ %inc, %for.body ] ; <i64> [#uses=5]
%cmp = icmp slt i64 %j.0, 1000 ; <i1> [#uses=1]
br i1 %cmp, label %for.body, label %for.end
for.body: ; preds = %for.cond
%arrayidx = getelementptr inbounds double* %G, i64 %j.0 ; <double*> [#uses=1]
%tmp3 = load double* %arrayidx ; <double> [#uses=1]
%sub = sub i64 %j.0, 1 ; <i64> [#uses=1]
%arrayidx6 = getelementptr inbounds double* %G, i64 %sub ; <double*> [#uses=1]
%tmp7 = load double* %arrayidx6 ; <double> [#uses=1]
%add = fadd double %tmp3, %tmp7 ; <double> [#uses=1]
%arrayidx10 = getelementptr inbounds double* %G, i64 %j.0 ; <double*> [#uses=1]
store double %add, double* %arrayidx10
%inc = add nsw i64 %j.0, 1 ; <i64> [#uses=1]
br label %for.cond
for.end: ; preds = %for.cond
ret void
}
; Should only end up with one phi. Also, the original for.cond block should
; be moved to the end of the loop so that the new loop header pleasantly
; ends up at the top.
; CHECK: define void @test
; CHECK-NEXT: entry:
; CHECK-NEXT: icmp slt i64
; CHECK-NEXT: br i1
; CHECK-NOT: :
; CHECK: bb.nph:
; CHECK-NEXT: br label %for.body
; CHECK-NOT: :
; CHECK: for.body:
; CHECK-NEXT: %j.02 = phi i64
; CHECK-NOT: phi
; CHECK: ret void
; CHECK-NEXT: }