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llvm-project/llvm/test/Transforms/LICM/assume.ll

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MemorySSA: Revert r269678 and r268068; replace with special casing in MemorySSA. It turns out that too many passes are relying on alias analysis results for control dependencies. Until we fix that by introducing a more accurate modelling of control dependencies, special case assume in MemorySSA instead. Also introduce tests to ensure we don't regress the FunctionAttrs or LICM passes. Differential Revision: http://reviews.llvm.org/D20658 llvm-svn: 270823
2016-05-26 12:58:46 +08:00
; RUN: opt -licm -basicaa < %s -S | FileCheck %s
[LICM] Report successful hoist/sink/promotion Differential Revision: https://reviews.llvm.org/D27938 llvm-svn: 291646
2017-01-11 12:39:35 +08:00
; RUN: opt -aa-pipeline=basic-aa -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop(licm)' < %s -S | FileCheck %s
MemorySSA: Revert r269678 and r268068; replace with special casing in MemorySSA. It turns out that too many passes are relying on alias analysis results for control dependencies. Until we fix that by introducing a more accurate modelling of control dependencies, special case assume in MemorySSA instead. Also introduce tests to ensure we don't regress the FunctionAttrs or LICM passes. Differential Revision: http://reviews.llvm.org/D20658 llvm-svn: 270823
2016-05-26 12:58:46 +08:00
[ValueTracking] Calls to @llvm.assume always return This change teaches llvm::isGuaranteedToTransferExecutionToSuccessor that calls to @llvm.assume always terminate. Most other relevant intrinsics should be covered by the "CS.onlyReadsMemory() || CS.onlyAccessesArgMemory()" bit but we were missing @llvm.assumes because we state that it clobbers memory. Added an LICM test case, but this change is not specific to LICM. llvm-svn: 272703
2016-06-15 04:23:16 +08:00
define void @f_0(i1 %p) nounwind ssp {
; CHECK-LABEL: @f_0(
MemorySSA: Revert r269678 and r268068; replace with special casing in MemorySSA. It turns out that too many passes are relying on alias analysis results for control dependencies. Until we fix that by introducing a more accurate modelling of control dependencies, special case assume in MemorySSA instead. Also introduce tests to ensure we don't regress the FunctionAttrs or LICM passes. Differential Revision: http://reviews.llvm.org/D20658 llvm-svn: 270823
2016-05-26 12:58:46 +08:00
entry:
br label %for.body
for.body:
br i1 undef, label %if.then, label %for.cond.backedge
for.cond.backedge:
br i1 undef, label %for.end104, label %for.body
if.then:
br i1 undef, label %if.then27, label %if.end.if.end.split_crit_edge.critedge
if.then27:
; CHECK: tail call void @llvm.assume
tail call void @llvm.assume(i1 %p)
br label %for.body61.us
if.end.if.end.split_crit_edge.critedge:
br label %for.body61
for.body61.us:
br i1 undef, label %for.cond.backedge, label %for.body61.us
for.body61:
br i1 undef, label %for.cond.backedge, label %for.body61
for.end104:
ret void
}
[ValueTracking] Calls to @llvm.assume always return This change teaches llvm::isGuaranteedToTransferExecutionToSuccessor that calls to @llvm.assume always terminate. Most other relevant intrinsics should be covered by the "CS.onlyReadsMemory() || CS.onlyAccessesArgMemory()" bit but we were missing @llvm.assumes because we state that it clobbers memory. Added an LICM test case, but this change is not specific to LICM. llvm-svn: 272703
2016-06-15 04:23:16 +08:00
define void @f_1(i1 %cond, i32* %ptr) {
; CHECK-LABEL: @f_1(
; CHECK: %val = load i32, i32* %ptr
; CHECK-NEXT: br label %loop
entry:
br label %loop
loop:
%x = phi i32 [ 0, %entry ], [ %x.inc, %loop ]
call void @llvm.assume(i1 %cond)
%val = load i32, i32* %ptr
%x.inc = add i32 %x, %val
br label %loop
}
MemorySSA: Revert r269678 and r268068; replace with special casing in MemorySSA. It turns out that too many passes are relying on alias analysis results for control dependencies. Until we fix that by introducing a more accurate modelling of control dependencies, special case assume in MemorySSA instead. Also introduce tests to ensure we don't regress the FunctionAttrs or LICM passes. Differential Revision: http://reviews.llvm.org/D20658 llvm-svn: 270823
2016-05-26 12:58:46 +08:00
declare void @llvm.assume(i1)