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[IndVarSimplify] Fix IndVarSimplify to skip on unfolding predicates when the loop contains control convergence operations. #165643

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[IndVarSimplify] Fix IndVarSimplify to skip on unfolding predicates when the loop contains control convergence operations. #165643

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e01b798
Fix indvar pass to skip on unfolding predicates on control convergenc…
luciechoi Oct 30, 2025
4fc8d87
Use helper
luciechoi Oct 30, 2025
616241b
Check the loop blocks to see if the token is referenced outside the loop
luciechoi Nov 1, 2025
2cdea74
Simplify unit tests
luciechoi Nov 4, 2025
a8fa468
merge loops
luciechoi Nov 6, 2025
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31 changes: 31 additions & 0 deletions llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
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Expand Up @@ -1859,6 +1859,37 @@ bool IndVarSimplify::predicateLoopExits(Loop *L, SCEVExpander &Rewriter) {
}
}

// If the loop body uses a convergence token defined within the loop, skip
// predication. This is to avoid changing the convergence behavior of the
// loop.
SmallVector<BasicBlock *, 16> blocks = ExitingBlocks;
SmallVector<Value *, 16> tokens = {};
size_t index = 0; // Assume Exiting Blocks are sorted.
while (index < blocks.size()) {
BasicBlock *BB = blocks[index];
index++;
const auto exitingBlockName = BB->getName();
for (Instruction &I : *BB) {
// Check if the instruction uses any convergence tokens.
if (auto *CB = dyn_cast<CallBase>(&I);
CB && !isa<ConvergenceControlInst>(&I)) {
auto token = CB->getConvergenceControlToken();
if (token && llvm::is_contained(tokens, token)) {
return false;
}
}
if (isa<ConvergenceControlInst>(&I)) {
tokens.push_back(cast<Value>(&I));
}
}

for (BasicBlock *Succ : successors(BB)) {
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@nikic nikic Oct 30, 2025

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This is very inefficient. It would make more sense to look for any convergence control tokens defined in the loop and inspect their users. Instead of inspecting the entire function reachable from the loop exit.

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@s-perron s-perron Oct 30, 2025

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+1

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@luciechoi luciechoi Oct 30, 2025

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Thank you both for pointing out. As discussed offline with Steven, I've modified to use analyzeBasicBlock helper instead, like in LoopUnrollPass.

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@nikic nikic Oct 31, 2025

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I don't think analyzeBasicBlock is appropriate here -- CodeMetrics is a utility for transforms that perform block cloning.

Looking a bit closer, I'm also not sure the problem here is really related to convergence control per se. This transform is generally not valid for cases where a value defined in the loop is used outside the loop. Normally, this is enforced by checking for the absence of LCSSA phis. However, token-returning instructions are a special case, because LCSSA cannot be formed for them.

So I think what you should be doing is looking for any token-returning instructions in the loop (not necessarily convergence control in particular) and bailing out if they have uses outside the loop.

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@s-perron s-perron Oct 31, 2025

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I don't think analyzeBasicBlock is appropriate here -- CodeMetrics is a utility for transforms that perform block cloning.

For the convergence tokens, the check if there is an extended loop does exactly what you suggested. If the loop has a convergence token and it is used outside the loop, then the convergence will be ExtendedLoop. However, it can be overkill because it checks for more than it necessary for this pass.

Also it is not appropriate if we want to generalized this to all tokens, which seems to be the right direction.

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@luciechoi luciechoi Nov 1, 2025 •
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Thanks, removed analyzeBasicBlock and updated the code to check for any tokens used outside the loop.

const auto succName = Succ->getName();
if (Succ != L->getLoopLatch() && !llvm::is_contained(blocks, Succ))
blocks.push_back(Succ);
}
}

bool Changed = false;
// Finally, do the actual predication for all predicatable blocks. A couple
// of notes here:
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98 changes: 98 additions & 0 deletions llvm/test/Transforms/IndVarSimplify/skip-predication-convergence.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=indvars -indvars-predicate-loops=1 -S | FileCheck %s

; Loop with body using loop convergence token should be skipped by IndVarSimplify.

%"class.hlsl::RWStructuredBuffer" = type { target("spirv.VulkanBuffer", [0 x i32], 12, 1), target("spirv.VulkanBuffer", i32, 12, 1) }

@_ZL3Out = internal global %"class.hlsl::RWStructuredBuffer" poison, align 8
@.str = private unnamed_addr constant [4 x i8] c"Out\00", align 1

declare token @llvm.experimental.convergence.entry() #0

define void @loop() local_unnamed_addr #1 {
; CHECK-LABEL: @loop(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = tail call token @llvm.experimental.convergence.entry()
; CHECK-NEXT: [[TMP1:%.*]] = tail call target("spirv.VulkanBuffer", [0 x i32], 12, 1) @llvm.spv.resource.handlefrombinding.tspirv.VulkanBuffer_a0i32_12_1t(i32 0, i32 0, i32 1, i32 0, ptr nonnull @.str)
; CHECK-NEXT: [[TMP2:%.*]] = tail call target("spirv.VulkanBuffer", i32, 12, 1) @llvm.spv.resource.counterhandlefromimplicitbinding.tspirv.VulkanBuffer_i32_12_1t.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1) [[TMP1]], i32 0, i32 0)
; CHECK-NEXT: store target("spirv.VulkanBuffer", [0 x i32], 12, 1) [[TMP1]], ptr @_ZL3Out, align 8
; CHECK-NEXT: store target("spirv.VulkanBuffer", i32, 12, 1) [[TMP2]], ptr getelementptr inbounds nuw (i8, ptr @_ZL3Out, i64 8), align 8
; CHECK-NEXT: [[TMP3:%.*]] = tail call i32 @llvm.spv.thread.id.in.group.i32(i32 0)
; CHECK-NEXT: br label [[FOR_COND_I:%.*]]
; CHECK: for.cond.i:
; CHECK-NEXT: [[I_0_I:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC_I:%.*]], [[FOR_BODY_I:%.*]] ]
; CHECK-NEXT: [[TMP4:%.*]] = call token @llvm.experimental.convergence.loop() [ "convergencectrl"(token [[TMP0]]) ]
; CHECK-NEXT: [[CMP_I:%.*]] = icmp ult i32 [[I_0_I]], 8
; CHECK-NEXT: br i1 [[CMP_I]], label [[FOR_BODY_I]], label [[_Z4LOOPDV3_J_EXIT_LOOPEXIT:%.*]]
; CHECK: for.body.i:
; CHECK-NEXT: [[CMP1_I:%.*]] = icmp eq i32 [[I_0_I]], [[TMP3]]
; CHECK-NEXT: [[INC_I]] = add nuw nsw i32 [[I_0_I]], 1
; CHECK-NEXT: br i1 [[CMP1_I]], label [[IF_THEN_I:%.*]], label [[FOR_COND_I]]
; CHECK: _Z4loopDv3_j.exit.loopexit:
; CHECK-NEXT: br label [[_Z4LOOPDV3_J_EXIT:%.*]]
; CHECK: if.then.i:
; CHECK-NEXT: [[HLSL_WAVE_ACTIVE_MAX2_I:%.*]] = call spir_func i32 @llvm.spv.wave.reduce.umax.i32(i32 [[TMP3]]) [ "convergencectrl"(token [[TMP4]]) ]
; CHECK-NEXT: [[TMP5:%.*]] = tail call noundef align 4 dereferenceable(4) ptr addrspace(11) @llvm.spv.resource.getpointer.p11.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1) [[TMP1]], i32 [[TMP3]])
; CHECK-NEXT: store i32 [[HLSL_WAVE_ACTIVE_MAX2_I]], ptr addrspace(11) [[TMP5]], align 4
; CHECK-NEXT: br label [[_Z4LOOPDV3_J_EXIT]]
; CHECK: _Z4loopDv3_j.exit:
; CHECK-NEXT: ret void
;
entry:
%0 = tail call token @llvm.experimental.convergence.entry()
%1 = tail call target("spirv.VulkanBuffer", [0 x i32], 12, 1) @llvm.spv.resource.handlefrombinding.tspirv.VulkanBuffer_a0i32_12_1t(i32 0, i32 0, i32 1, i32 0, ptr nonnull @.str)
%2 = tail call target("spirv.VulkanBuffer", i32, 12, 1) @llvm.spv.resource.counterhandlefromimplicitbinding.tspirv.VulkanBuffer_i32_12_1t.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1) %1, i32 0, i32 0)
store target("spirv.VulkanBuffer", [0 x i32], 12, 1) %1, ptr @_ZL3Out, align 8
store target("spirv.VulkanBuffer", i32, 12, 1) %2, ptr getelementptr inbounds nuw (i8, ptr @_ZL3Out, i64 8), align 8
%3 = tail call i32 @llvm.spv.thread.id.in.group.i32(i32 0)
br label %for.cond.i

; Loop:
for.cond.i: ; preds = %for.body.i, %entry
%i.0.i = phi i32 [ 0, %entry ], [ %inc.i, %for.body.i ]
%4 = call token @llvm.experimental.convergence.loop() [ "convergencectrl"(token %0) ]
%cmp.i = icmp ult i32 %i.0.i, 8
br i1 %cmp.i, label %for.body.i, label %_Z4loopDv3_j.exit.loopexit

for.body.i: ; preds = %for.cond.i
%cmp1.i = icmp eq i32 %i.0.i, %3
%inc.i = add nuw nsw i32 %i.0.i, 1
br i1 %cmp1.i, label %if.then.i, label %for.cond.i

; Exit blocks
_Z4loopDv3_j.exit.loopexit: ; preds = %for.cond.i
br label %_Z4loopDv3_j.exit

if.then.i: ; preds = %for.body.i
%hlsl.wave.active.max2.i = call spir_func i32 @llvm.spv.wave.reduce.umax.i32(i32 %3) [ "convergencectrl"(token %4) ]
%5 = tail call noundef align 4 dereferenceable(4) ptr addrspace(11) @llvm.spv.resource.getpointer.p11.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1) %1, i32 %3)
store i32 %hlsl.wave.active.max2.i, ptr addrspace(11) %5, align 4
br label %_Z4loopDv3_j.exit

_Z4loopDv3_j.exit: ; preds = %_Z4loopDv3_j.exit.loopexit, %if.then.i
ret void
}

; Function Attrs: mustprogress nofree nosync nounwind willreturn memory(none)
declare i32 @llvm.spv.thread.id.in.group.i32(i32) #2

; Function Attrs: convergent mustprogress nocallback nofree nosync nounwind willreturn memory(none)
declare token @llvm.experimental.convergence.loop() #0

; Function Attrs: convergent mustprogress nocallback nofree nosync nounwind willreturn memory(none)
declare i32 @llvm.spv.wave.reduce.umax.i32(i32) #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(none)
declare target("spirv.VulkanBuffer", [0 x i32], 12, 1) @llvm.spv.resource.handlefrombinding.tspirv.VulkanBuffer_a0i32_12_1t(i32, i32, i32, i32, ptr) #4

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(none)
declare target("spirv.VulkanBuffer", i32, 12, 1) @llvm.spv.resource.counterhandlefromimplicitbinding.tspirv.VulkanBuffer_i32_12_1t.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1), i32, i32) #4

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(none)
declare ptr addrspace(11) @llvm.spv.resource.getpointer.p11.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1), i32) #4

attributes #0 = { convergent mustprogress nocallback nofree nosync nounwind willreturn memory(none) }
attributes #1 = { convergent noinline norecurse "frame-pointer"="all" "hlsl.numthreads"="8,1,1" "hlsl.shader"="compute" "no-infs-fp-math"="true" "no-nans-fp-math"="true" "no-signed-zeros-fp-math"="true" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
attributes #2 = { mustprogress nofree nosync nounwind willreturn memory(none) }
attributes #4 = { mustprogress nocallback nofree nosync nounwind willreturn memory(none) }
139 changes: 139 additions & 0 deletions llvm/test/Transforms/IndVarSimplify/skip-predictaion-nested-convergence.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=indvars -indvars-predicate-loops=1 -S | FileCheck %s

; Nested loops with body using loop convergence token should be skipped by IndVarSimplify.

%"class.hlsl::RWStructuredBuffer" = type { target("spirv.VulkanBuffer", [0 x i32], 12, 1), target("spirv.VulkanBuffer", i32, 12, 1) }

@_ZL3Out = internal global %"class.hlsl::RWStructuredBuffer" poison, align 8
@.str = private unnamed_addr constant [4 x i8] c"Out\00", align 1

; Function Attrs: convergent mustprogress nocallback nofree nosync nounwind willreturn memory(none)
declare token @llvm.experimental.convergence.entry() #0

define void @nested() local_unnamed_addr #1 {
; CHECK-LABEL: @nested(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = tail call token @llvm.experimental.convergence.entry()
; CHECK-NEXT: [[TMP1:%.*]] = tail call target("spirv.VulkanBuffer", [0 x i32], 12, 1) @llvm.spv.resource.handlefrombinding.tspirv.VulkanBuffer_a0i32_12_1t(i32 0, i32 0, i32 1, i32 0, ptr nonnull @.str)
; CHECK-NEXT: [[TMP2:%.*]] = tail call target("spirv.VulkanBuffer", i32, 12, 1) @llvm.spv.resource.counterhandlefromimplicitbinding.tspirv.VulkanBuffer_i32_12_1t.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1) [[TMP1]], i32 0, i32 0)
; CHECK-NEXT: store target("spirv.VulkanBuffer", [0 x i32], 12, 1) [[TMP1]], ptr @_ZL3Out, align 8
; CHECK-NEXT: store target("spirv.VulkanBuffer", i32, 12, 1) [[TMP2]], ptr getelementptr inbounds nuw (i8, ptr @_ZL3Out, i64 8), align 8
; CHECK-NEXT: [[TMP3:%.*]] = tail call i32 @llvm.spv.thread.id.in.group.i32(i32 0)
; CHECK-NEXT: [[TMP4:%.*]] = tail call i32 @llvm.spv.thread.id.in.group.i32(i32 1)
; CHECK-NEXT: [[MUL_I:%.*]] = shl nuw nsw i32 [[TMP3]], 3
; CHECK-NEXT: [[ADD_I:%.*]] = add nuw nsw i32 [[MUL_I]], [[TMP4]]
; CHECK-NEXT: br label [[FOR_COND_I:%.*]]
; CHECK: for.cond.i:
; CHECK-NEXT: [[I_0_I:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC10_I:%.*]], [[CLEANUP_I:%.*]] ]
; CHECK-NEXT: [[TMP5:%.*]] = call token @llvm.experimental.convergence.loop() [ "convergencectrl"(token [[TMP0]]) ]
; CHECK-NEXT: [[CMP_I:%.*]] = icmp ult i32 [[I_0_I]], 8
; CHECK-NEXT: br i1 [[CMP_I]], label [[FOR_COND1_I_PREHEADER:%.*]], label [[_Z4NESTEDDV3_J_EXIT:%.*]]
; CHECK: for.cond1.i.preheader:
; CHECK-NEXT: [[CMP5_I:%.*]] = icmp eq i32 [[I_0_I]], [[TMP3]]
; CHECK-NEXT: br label [[FOR_COND1_I:%.*]]
; CHECK: for.cond1.i:
; CHECK-NEXT: [[J_0_I:%.*]] = phi i32 [ [[INC_I:%.*]], [[FOR_BODY4_I:%.*]] ], [ 0, [[FOR_COND1_I_PREHEADER]] ]
; CHECK-NEXT: [[TMP6:%.*]] = call token @llvm.experimental.convergence.loop() [ "convergencectrl"(token [[TMP5]]) ]
; CHECK-NEXT: [[CMP2_I:%.*]] = icmp ult i32 [[J_0_I]], 8
; CHECK-NEXT: br i1 [[CMP2_I]], label [[FOR_BODY4_I]], label [[CLEANUP_I_LOOPEXIT:%.*]]
; CHECK: for.body4.i:
; CHECK-NEXT: [[CMP6_I:%.*]] = icmp eq i32 [[J_0_I]], [[TMP4]]
; CHECK-NEXT: [[OR_COND:%.*]] = select i1 [[CMP5_I]], i1 [[CMP6_I]], i1 false
; CHECK-NEXT: [[INC_I]] = add nuw nsw i32 [[J_0_I]], 1
; CHECK-NEXT: br i1 [[OR_COND]], label [[IF_THEN_I:%.*]], label [[FOR_COND1_I]]
; CHECK: cleanup.i.loopexit:
; CHECK-NEXT: br label [[CLEANUP_I]]
; CHECK: if.then.i:
; CHECK-NEXT: [[HLSL_WAVE_ACTIVE_MAX7_I:%.*]] = call spir_func i32 @llvm.spv.wave.reduce.umax.i32(i32 [[ADD_I]]) [ "convergencectrl"(token [[TMP6]]) ]
; CHECK-NEXT: [[TMP7:%.*]] = tail call noundef align 4 dereferenceable(4) ptr addrspace(11) @llvm.spv.resource.getpointer.p11.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1) [[TMP1]], i32 [[ADD_I]])
; CHECK-NEXT: store i32 [[HLSL_WAVE_ACTIVE_MAX7_I]], ptr addrspace(11) [[TMP7]], align 4
; CHECK-NEXT: br label [[CLEANUP_I]]
; CHECK: cleanup.i:
; CHECK-NEXT: [[INC10_I]] = add nuw nsw i32 [[I_0_I]], 1
; CHECK-NEXT: br label [[FOR_COND_I]]
; CHECK: _Z4nestedDv3_j.exit:
; CHECK-NEXT: ret void
;
entry:
%0 = tail call token @llvm.experimental.convergence.entry()
%1 = tail call target("spirv.VulkanBuffer", [0 x i32], 12, 1) @llvm.spv.resource.handlefrombinding.tspirv.VulkanBuffer_a0i32_12_1t(i32 0, i32 0, i32 1, i32 0, ptr nonnull @.str)
%2 = tail call target("spirv.VulkanBuffer", i32, 12, 1) @llvm.spv.resource.counterhandlefromimplicitbinding.tspirv.VulkanBuffer_i32_12_1t.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1) %1, i32 0, i32 0)
store target("spirv.VulkanBuffer", [0 x i32], 12, 1) %1, ptr @_ZL3Out, align 8
store target("spirv.VulkanBuffer", i32, 12, 1) %2, ptr getelementptr inbounds nuw (i8, ptr @_ZL3Out, i64 8), align 8
%3 = tail call i32 @llvm.spv.thread.id.in.group.i32(i32 0)
%4 = tail call i32 @llvm.spv.thread.id.in.group.i32(i32 1)
%mul.i = shl nuw nsw i32 %3, 3
%add.i = add nuw nsw i32 %mul.i, %4
br label %for.cond.i

for.cond.i: ; preds = %cleanup.i, %entry
%i.0.i = phi i32 [ 0, %entry ], [ %inc10.i, %cleanup.i ]
%5 = call token @llvm.experimental.convergence.loop() [ "convergencectrl"(token %0) ]
%cmp.i = icmp ult i32 %i.0.i, 8
br i1 %cmp.i, label %for.cond1.i.preheader, label %_Z4nestedDv3_j.exit

; Preheader:
for.cond1.i.preheader: ; preds = %for.cond.i
%cmp5.i = icmp eq i32 %i.0.i, %3
br label %for.cond1.i

; Loop:
for.cond1.i: ; preds = %for.body4.i, %for.cond1.i.preheader
%j.0.i = phi i32 [ %inc.i, %for.body4.i ], [ 0, %for.cond1.i.preheader ]
%6 = call token @llvm.experimental.convergence.loop() [ "convergencectrl"(token %5) ]
%cmp2.i = icmp ult i32 %j.0.i, 8
br i1 %cmp2.i, label %for.body4.i, label %cleanup.i.loopexit

for.body4.i: ; preds = %for.cond1.i
%cmp6.i = icmp eq i32 %j.0.i, %4
%or.cond = select i1 %cmp5.i, i1 %cmp6.i, i1 false
%inc.i = add nuw nsw i32 %j.0.i, 1
br i1 %or.cond, label %if.then.i, label %for.cond1.i

; Exit blocks
cleanup.i.loopexit: ; preds = %for.cond1.i
br label %cleanup.i

if.then.i: ; preds = %for.body4.i
%hlsl.wave.active.max7.i = call spir_func i32 @llvm.spv.wave.reduce.umax.i32(i32 %add.i) [ "convergencectrl"(token %6) ]
%7 = tail call noundef align 4 dereferenceable(4) ptr addrspace(11) @llvm.spv.resource.getpointer.p11.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1) %1, i32 %add.i)
store i32 %hlsl.wave.active.max7.i, ptr addrspace(11) %7, align 4
br label %cleanup.i

cleanup.i: ; preds = %cleanup.i.loopexit, %if.then.i
%inc10.i = add nuw nsw i32 %i.0.i, 1
br label %for.cond.i

_Z4nestedDv3_j.exit: ; preds = %for.cond.i
ret void
}

; Function Attrs: mustprogress nofree nosync nounwind willreturn memory(none)
declare i32 @llvm.spv.thread.id.in.group.i32(i32) #2

; Function Attrs: convergent mustprogress nocallback nofree nosync nounwind willreturn memory(none)
declare token @llvm.experimental.convergence.loop() #0

; Function Attrs: convergent mustprogress nocallback nofree nosync nounwind willreturn memory(none)
declare i32 @llvm.spv.wave.reduce.umax.i32(i32) #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(none)
declare target("spirv.VulkanBuffer", [0 x i32], 12, 1) @llvm.spv.resource.handlefrombinding.tspirv.VulkanBuffer_a0i32_12_1t(i32, i32, i32, i32, ptr) #4

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(none)
declare target("spirv.VulkanBuffer", i32, 12, 1) @llvm.spv.resource.counterhandlefromimplicitbinding.tspirv.VulkanBuffer_i32_12_1t.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1), i32, i32) #4

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(none)
declare ptr addrspace(11) @llvm.spv.resource.getpointer.p11.tspirv.VulkanBuffer_a0i32_12_1t(target("spirv.VulkanBuffer", [0 x i32], 12, 1), i32) #4

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: readwrite)
declare void @llvm.experimental.noalias.scope.decl(metadata) #5

attributes #0 = { convergent mustprogress nocallback nofree nosync nounwind willreturn memory(none) }
attributes #1 = { convergent noinline norecurse "frame-pointer"="all" "hlsl.numthreads"="8,8,1" "hlsl.shader"="compute" "no-infs-fp-math"="true" "no-nans-fp-math"="true" "no-signed-zeros-fp-math"="true" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
attributes #2 = { mustprogress nofree nosync nounwind willreturn memory(none) }
attributes #3 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { mustprogress nocallback nofree nosync nounwind willreturn memory(none) }
attributes #5 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: readwrite) }
attributes #6 = { nounwind }
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