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| author | Geoff Berry <gberry@codeaurora.org> | 2016-08-11 21:05:17 +0000 |
|---|---|---|
| committer | Geoff Berry <gberry@codeaurora.org> | 2016-08-11 21:05:17 +0000 |
| commit | d01828096f1660ae3641d2a345fe0b026acda2c9 (patch) | |
| tree | 4a14f2ea454373775305a2785ae1725d9034d04a /llvm/test/Transforms/LoopStrengthReduce/X86 | |
| parent | cb7d83c048c2ef7ce25bd4eb6bb9197ab6533cc4 (diff) | |
| download | bcm5719-llvm-d01828096f1660ae3641d2a345fe0b026acda2c9.tar.gz bcm5719-llvm-d01828096f1660ae3641d2a345fe0b026acda2c9.zip | |
[SCEV] Update interface to handle SCEVExpander insert point motion.
Summary:
This is an extension of the fix in r271424. That fix dealt with builder
insert points being moved by SCEV expansion, but only for the lifetime
of the expand call. This change modifies the interface so that LSR can
safely call expand multiple times at the same insert point and do the
right thing if one of the expansions decides to move the original insert
point.
This is a fix for PR28719.
Reviewers: sanjoy
Subscribers: llvm-commits, mcrosier, mzolotukhin
Differential Revision: https://reviews.llvm.org/D23342
llvm-svn: 278413
Diffstat (limited to 'llvm/test/Transforms/LoopStrengthReduce/X86')
| -rw-r--r-- | llvm/test/Transforms/LoopStrengthReduce/X86/pr28719.ll | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopStrengthReduce/X86/pr28719.ll b/llvm/test/Transforms/LoopStrengthReduce/X86/pr28719.ll new file mode 100644 index 00000000000..0e74ff20073 --- /dev/null +++ b/llvm/test/Transforms/LoopStrengthReduce/X86/pr28719.ll @@ -0,0 +1,47 @@ +; RUN: opt < %s -loop-reduce -S | FileCheck %s + +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-unknown-linux-gnu" + +@a = global i32 0, align 4 +@b = global i8 0, align 1 +@c = global [4 x i8] zeroinitializer, align 1 + +; Just make sure we don't generate code with uses not dominated by defs. +; CHECK-LABEL: @main( +define i32 @main() { +entry: + %a0 = load i32, i32* @a, align 4 + %cmpa = icmp slt i32 %a0, 4 + br i1 %cmpa, label %preheader, label %for.end + +preheader: + %b0 = load i8, i8* @b, align 1 + %b0sext = sext i8 %b0 to i64 + br label %for.body + +for.body: + %iv = phi i64 [ 0, %preheader ], [ %iv.next, %lor.false ] + %mul = mul nsw i64 %b0sext, %iv + %multrunc = trunc i64 %mul to i32 + %cmp = icmp eq i32 %multrunc, 0 + br i1 %cmp, label %lor.false, label %if.then + +lor.false: + %cgep = getelementptr inbounds [4 x i8], [4 x i8]* @c, i64 0, i64 %iv + %ci = load i8, i8* %cgep, align 1 + %cisext = sext i8 %ci to i32 + %ivtrunc = trunc i64 %iv to i32 + %cmp2 = icmp eq i32 %cisext, %ivtrunc + %iv.next = add i64 %iv, 1 + br i1 %cmp2, label %for.body, label %if.then + +if.then: + tail call void @abort() + unreachable + +for.end: + ret i32 0 +} + +declare void @abort() |
