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'optnone' should not disable DAG combiner.
Reverts the code change from r221168 and the relevant test. It was a mistake to disable the combiner, and based on the ultimate definition of 'optnone' we shouldn't have considered the test case as failing in the first place. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233153 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1183,11 +1183,6 @@ void DAGCombiner::Run(CombineLevel AtLevel) {
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LegalOperations = Level >= AfterLegalizeVectorOps;
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LegalTypes = Level >= AfterLegalizeTypes;
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// Early exit if this basic block is in an optnone function.
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if (DAG.getMachineFunction().getFunction()->hasFnAttribute(
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Attribute::OptimizeNone))
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return;
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// Add all the dag nodes to the worklist.
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for (SelectionDAG::allnodes_iterator I = DAG.allnodes_begin(),
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E = DAG.allnodes_end(); I != E; ++I)
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@ -1,35 +0,0 @@
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; RUN: llc < %s -mcpu=corei7 -march=x86-64 -mattr=+sse2 | FileCheck %s
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; Verify that floating-point operations inside 'optnone' functions
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; are not optimized even if unsafe-fp-math is set.
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define float @foo(float %x) #0 {
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entry:
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%add = fadd fast float %x, %x
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%add1 = fadd fast float %add, %x
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ret float %add1
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}
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; CHECK-LABEL: @foo
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; CHECK-NOT: add
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; CHECK: mul
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; CHECK-NOT: add
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; CHECK: ret
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define float @fooWithOptnone(float %x) #1 {
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entry:
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%add = fadd fast float %x, %x
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%add1 = fadd fast float %add, %x
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ret float %add1
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}
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; CHECK-LABEL: @fooWithOptnone
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; CHECK-NOT: mul
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; CHECK: add
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; CHECK-NOT: mul
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; CHECK: add
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; CHECK-NOT: mul
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; CHECK: ret
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attributes #0 = { "unsafe-fp-math"="true" }
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attributes #1 = { noinline optnone "unsafe-fp-math"="true" }
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