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Unit test for LSR phi reuse in r141442.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141472 91177308-0d34-0410-b5e6-96231b3b80d8
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Andrew Trick 2011-10-08 02:34:51 +00:00
parent cb518ee5dd
commit 861a410cb6
1 changed files with 53 additions and 0 deletions
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test/Transforms/LoopStrengthReduce/2011-10-06-ReusePhi.ll Normal file
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; RUN: opt -loop-reduce -S < %s | FileCheck %s
;
; Test LSR's intelligence regarding phi reuse.
; Verify that scaled GEPs are not reused. rdar://5064068
target triple = "x86-apple-darwin"
; CHECK: @test
; multiplies are hoisted out of the loop
; CHECK: while.body.lr.ph:
; CHECK: mul i64
; CHECK: mul i64
; GEPs are ugly
; CHECK: while.body:
; CHECK: phi
; CHECK: phi
; CHECK: phi
; CHECK: phi
; CHECK-NOT: phi
; CHECK: bitcast float* {{.*}} to i8*
; CHECK: bitcast float* {{.*}} to i8*
; CHECK: getelementptr i8*
; CHECK: getelementptr i8*
define float @test(float* nocapture %A, float* nocapture %B, i32 %N, i32 %IA, i32 %IB) nounwind uwtable readonly ssp {
entry:
%cmp1 = icmp sgt i32 %N, 0
br i1 %cmp1, label %while.body.lr.ph, label %while.end
while.body.lr.ph: ; preds = %entry
%idx.ext = sext i32 %IA to i64
%idx.ext2 = sext i32 %IB to i64
br label %while.body
while.body: ; preds = %while.body.lr.ph, %while.body
%A.addr.05 = phi float* [ %A, %while.body.lr.ph ], [ %add.ptr, %while.body ]
%B.addr.04 = phi float* [ %B, %while.body.lr.ph ], [ %add.ptr3, %while.body ]
%N.addr.03 = phi i32 [ %N, %while.body.lr.ph ], [ %sub, %while.body ]
%Sum0.02 = phi float [ 0.000000e+00, %while.body.lr.ph ], [ %add, %while.body ]
%0 = load float* %A.addr.05, align 4
%1 = load float* %B.addr.04, align 4
%mul = fmul float %0, %1
%add = fadd float %Sum0.02, %mul
%add.ptr = getelementptr inbounds float* %A.addr.05, i64 %idx.ext
%add.ptr3 = getelementptr inbounds float* %B.addr.04, i64 %idx.ext2
%sub = add nsw i32 %N.addr.03, -1
%cmp = icmp sgt i32 %sub, 0
br i1 %cmp, label %while.body, label %while.end
while.end: ; preds = %while.body, %entry
%Sum0.0.lcssa = phi float [ 0.000000e+00, %entry ], [ %add, %while.body ]
ret float %Sum0.0.lcssa
}