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| author | Andrew Trick <atrick@apple.com> | 2011-08-10 04:29:49 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2011-08-10 04:29:49 +0000 |
| commit | 39f40299a6efc06747db0de53deb9be248913998 (patch) | |
| tree | 8608ebdf69e6320adcffed565af017fe6c10fb35 /test/Transforms/LoopUnroll/2011-08-09-IVSimplify.ll | |
| parent | bddb7f82103deb226baa6793f41c5961661167e7 (diff) | |
| download | external_llvm-39f40299a6efc06747db0de53deb9be248913998.zip external_llvm-39f40299a6efc06747db0de53deb9be248913998.tar.gz external_llvm-39f40299a6efc06747db0de53deb9be248913998.tar.bz2 | |
Invoke SimplifyIndVar when we partially unroll a loop. Fixes PR10534.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137203 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/LoopUnroll/2011-08-09-IVSimplify.ll')
| -rw-r--r-- | test/Transforms/LoopUnroll/2011-08-09-IVSimplify.ll | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/test/Transforms/LoopUnroll/2011-08-09-IVSimplify.ll b/test/Transforms/LoopUnroll/2011-08-09-IVSimplify.ll new file mode 100644 index 0000000..5790603 --- /dev/null +++ b/test/Transforms/LoopUnroll/2011-08-09-IVSimplify.ll @@ -0,0 +1,39 @@ +; RUN: opt -S < %s -loop-unroll -unroll-count=4 -disable-iv-rewrite | FileCheck %s +; +; Test induction variable simplify after loop unrolling. It should +; expose nice opportunities for GVN. + +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f80:128:128-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32" + +; PR10534: LoopUnroll not keeping canonical induction variable... +; CHECK: while.body.1: +; CHECK: %shr.1 = lshr i32 %bit_addr.addr.01, 5 +; CHECK: %arrayidx.1 = getelementptr inbounds i32* %bitmap, i32 %shr.1 +; CHECK: while.body.2: +; CHECK: %shr.2 = lshr i32 %bit_addr.addr.01, 5 +; CHECK: %arrayidx.2 = getelementptr inbounds i32* %bitmap, i32 %shr.2 +; CHECK: while.body.3: +; CHECK: %shr.3 = lshr i32 %bit_addr.addr.01, 5 +; CHECK: %arrayidx.3 = getelementptr inbounds i32* %bitmap, i32 %shr.3 +define void @FlipBit(i32* nocapture %bitmap, i32 %bit_addr, i32 %nbits) nounwind { +entry: + br label %while.body + +while.body: + %nbits.addr.02 = phi i32 [ 128, %entry ], [ %dec, %while.body ] + %bit_addr.addr.01 = phi i32 [ 0, %entry ], [ %inc, %while.body ] + %dec = add i32 %nbits.addr.02, -1 + %shr = lshr i32 %bit_addr.addr.01, 5 + %rem = and i32 %bit_addr.addr.01, 31 + %shl = shl i32 1, %rem + %arrayidx = getelementptr inbounds i32* %bitmap, i32 %shr + %tmp6 = load i32* %arrayidx, align 4 + %xor = xor i32 %tmp6, %shl + store i32 %xor, i32* %arrayidx, align 4 + %inc = add i32 %bit_addr.addr.01, 1 + %tobool = icmp eq i32 %dec, 0 + br i1 %tobool, label %while.end, label %while.body + +while.end: + ret void +} |