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LoopLoadElim: Respect convergent

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llvm-svn: 363162
This commit is contained in:
Matt Arsenault 2019-06-12 13:50:47 +00:00
parent 39ea14b833
commit d7a136621f
2 changed files with 57 additions and 0 deletions
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6
lib/Transforms/Scalar/LoopLoadElimination.cpp
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@ -534,6 +534,12 @@ public:
}
if (!Checks.empty() || !LAI.getPSE().getUnionPredicate().isAlwaysTrue()) {
if (LAI.hasConvergentOp()) {
LLVM_DEBUG(dbgs() << "Versioning is needed but not allowed with "
"convergent calls\n");
return false;
}
auto *HeaderBB = L->getHeader();
auto *F = HeaderBB->getParent();
bool OptForSize = F->hasOptSize() ||

51
test/Transforms/LoopLoadElim/convergent.ll Normal file
View File

@ -0,0 +1,51 @@
; RUN: opt -loop-load-elim -S < %s | FileCheck %s
; RUN: opt -passes=loop-load-elim -S < %s | FileCheck %s
; Simple st->ld forwarding derived from a lexical forward dep, but
; can't introduce runtime checks with a convergent call.
;
; for (unsigned i = 0; i < 100; i++) {
; A[i+1] = convergent(B[i]) + 2;
; C[i] = A[i] * 2;
; }
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
; CHECK-LABEL: @f_convergent(
; CHECK: call i32 @llvm.convergent(
; CHECK-NOT: call i32 @llvm.convergent(
define void @f_convergent(i32* %A, i32* %B, i32* %C, i64 %N) #0 {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%Aidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
%Bidx = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
%Cidx = getelementptr inbounds i32, i32* %C, i64 %indvars.iv
%Aidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
%b = load i32, i32* %Bidx, align 4
%convergent.b = call i32 @llvm.convergent(i32 %b)
%a_p1 = add i32 %convergent.b, 2
store i32 %a_p1, i32* %Aidx_next, align 4
%a = load i32, i32* %Aidx, align 1
%c = mul i32 %a, 2
store i32 %c, i32* %Cidx, align 4
%exitcond = icmp eq i64 %indvars.iv.next, %N
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
declare i32 @llvm.convergent(i32) #1
attributes #0 = { nounwind convergent }
attributes #1 = { nounwind readnone convergent }