f7988d08a8
This reverts commit 9b1e00738c.
Nikic reported in commit thread that I had forgotten history here, and that a) we'd tried this before, and b) had to revert due to an unexpected codegen impact. Current measurements confirm the same issue still exists.
112 lines
7.1 KiB
LLVM
112 lines
7.1 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt < %s -basic-aa -gvn -stats -disable-output 2>&1 | FileCheck %s
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; rdar://7363102
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; CHECK: Number of loads deleted
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; GVN should be able to eliminate load %tmp22.i, because it is redundant with
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; load %tmp8.i. This requires being able to prove that %tmp7.i doesn't
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; alias the malloc'd value %tmp.i20.i.i, which it can do since %tmp7.i
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; is derived from %tmp5.i which is computed from a load, and %tmp.i20.i.i
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; is never stored and does not escape.
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
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target triple = "x86_64-apple-darwin10.0"
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%"struct.llvm::MallocAllocator" = type <{ i8 }>
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%"struct.llvm::StringMap<void*,llvm::MallocAllocator>" = type { %"struct.llvm::StringMapImpl", %"struct.llvm::MallocAllocator" }
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%"struct.llvm::StringMapEntry<void*>" = type { %"struct.llvm::StringMapEntryBase", i8* }
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%"struct.llvm::StringMapEntryBase" = type { i32 }
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%"struct.llvm::StringMapImpl" = type { %"struct.llvm::StringMapImpl::ItemBucket"*, i32, i32, i32, i32 }
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%"struct.llvm::StringMapImpl::ItemBucket" = type { i32, %"struct.llvm::StringMapEntryBase"* }
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%"struct.llvm::StringRef" = type { i8*, i64 }
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define %"struct.llvm::StringMapEntry<void*>"* @_Z3fooRN4llvm9StringMapIPvNS_15MallocAllocatorEEEPKc(%"struct.llvm::StringMap<void*,llvm::MallocAllocator>"* %X, i8* %P) ssp {
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entry:
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%tmp = alloca %"struct.llvm::StringRef", align 8
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%tmp.i = getelementptr inbounds %"struct.llvm::StringRef", %"struct.llvm::StringRef"* %tmp, i64 0, i32 0
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store i8* %P, i8** %tmp.i, align 8
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%tmp1.i = call i64 @strlen(i8* %P) nounwind readonly
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%tmp2.i = getelementptr inbounds %"struct.llvm::StringRef", %"struct.llvm::StringRef"* %tmp, i64 0, i32 1
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store i64 %tmp1.i, i64* %tmp2.i, align 8
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%tmp1 = call %"struct.llvm::StringMapEntry<void*>"* @_ZN4llvm9StringMapIPvNS_15MallocAllocatorEE16GetOrCreateValueERKNS_9StringRefE(%"struct.llvm::StringMap<void*,llvm::MallocAllocator>"* %X, %"struct.llvm::StringRef"* %tmp) ssp
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ret %"struct.llvm::StringMapEntry<void*>"* %tmp1
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}
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declare i64 @strlen(i8* nocapture) nounwind readonly
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declare noalias i8* @malloc(i64) nounwind
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declare i32 @_ZN4llvm13StringMapImpl15LookupBucketForENS_9StringRefE(%"struct.llvm::StringMapImpl"*, i64, i64)
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define linkonce_odr %"struct.llvm::StringMapEntry<void*>"* @_ZN4llvm9StringMapIPvNS_15MallocAllocatorEE16GetOrCreateValueERKNS_9StringRefE(%"struct.llvm::StringMap<void*,llvm::MallocAllocator>"* %this, %"struct.llvm::StringRef"* nocapture %Key) ssp align 2 {
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entry:
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%elt = bitcast %"struct.llvm::StringRef"* %Key to i64*
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%val = load i64, i64* %elt
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%tmp = getelementptr inbounds %"struct.llvm::StringRef", %"struct.llvm::StringRef"* %Key, i64 0, i32 1
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%val2 = load i64, i64* %tmp
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%tmp2.i = getelementptr inbounds %"struct.llvm::StringMap<void*,llvm::MallocAllocator>", %"struct.llvm::StringMap<void*,llvm::MallocAllocator>"* %this, i64 0, i32 0
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%tmp3.i = tail call i32 @_ZN4llvm13StringMapImpl15LookupBucketForENS_9StringRefE(%"struct.llvm::StringMapImpl"* %tmp2.i, i64 %val, i64 %val2)
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%tmp4.i = getelementptr inbounds %"struct.llvm::StringMap<void*,llvm::MallocAllocator>", %"struct.llvm::StringMap<void*,llvm::MallocAllocator>"* %this, i64 0, i32 0, i32 0
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%tmp5.i = load %"struct.llvm::StringMapImpl::ItemBucket"*, %"struct.llvm::StringMapImpl::ItemBucket"** %tmp4.i, align 8
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%tmp6.i = zext i32 %tmp3.i to i64
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%tmp7.i = getelementptr inbounds %"struct.llvm::StringMapImpl::ItemBucket", %"struct.llvm::StringMapImpl::ItemBucket"* %tmp5.i, i64 %tmp6.i, i32 1
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%tmp8.i = load %"struct.llvm::StringMapEntryBase"*, %"struct.llvm::StringMapEntryBase"** %tmp7.i, align 8
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%tmp9.i = icmp eq %"struct.llvm::StringMapEntryBase"* %tmp8.i, null
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%tmp13.i = icmp eq %"struct.llvm::StringMapEntryBase"* %tmp8.i, inttoptr (i64 -1 to %"struct.llvm::StringMapEntryBase"*)
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%or.cond.i = or i1 %tmp9.i, %tmp13.i
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br i1 %or.cond.i, label %bb4.i, label %bb6.i
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bb4.i: ; preds = %entry
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%tmp41.i = inttoptr i64 %val to i8*
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%tmp4.i35.i = getelementptr inbounds i8, i8* %tmp41.i, i64 %val2
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%tmp.i.i = ptrtoint i8* %tmp4.i35.i to i64
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%tmp1.i.i = trunc i64 %tmp.i.i to i32
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%tmp3.i.i = trunc i64 %val to i32
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%tmp4.i.i = sub i32 %tmp1.i.i, %tmp3.i.i
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%tmp5.i.i = add i32 %tmp4.i.i, 17
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%tmp8.i.i = zext i32 %tmp5.i.i to i64
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%tmp.i20.i.i = tail call noalias i8* @malloc(i64 %tmp8.i.i) nounwind
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%tmp10.i.i = bitcast i8* %tmp.i20.i.i to %"struct.llvm::StringMapEntry<void*>"*
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%tmp12.i.i = icmp eq i8* %tmp.i20.i.i, null
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br i1 %tmp12.i.i, label %_ZN4llvm14StringMapEntryIPvE6CreateINS_15MallocAllocatorES1_EEPS2_PKcS7_RT_T0_.exit.i, label %bb.i.i
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bb.i.i: ; preds = %bb4.i
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%tmp.i.i.i.i = bitcast i8* %tmp.i20.i.i to i32*
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store i32 %tmp4.i.i, i32* %tmp.i.i.i.i, align 4
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%tmp1.i19.i.i = getelementptr inbounds i8, i8* %tmp.i20.i.i, i64 8
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%0 = bitcast i8* %tmp1.i19.i.i to i8**
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store i8* null, i8** %0, align 8
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br label %_ZN4llvm14StringMapEntryIPvE6CreateINS_15MallocAllocatorES1_EEPS2_PKcS7_RT_T0_.exit.i
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_ZN4llvm14StringMapEntryIPvE6CreateINS_15MallocAllocatorES1_EEPS2_PKcS7_RT_T0_.exit.i: ; preds = %bb.i.i, %bb4.i
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%tmp.i18.i.i = getelementptr inbounds i8, i8* %tmp.i20.i.i, i64 16
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%tmp15.i.i = zext i32 %tmp4.i.i to i64
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %tmp.i18.i.i, i8* %tmp41.i, i64 %tmp15.i.i, i1 false)
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%tmp.i18.sum.i.i = add i64 %tmp15.i.i, 16
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%tmp17.i.i = getelementptr inbounds i8, i8* %tmp.i20.i.i, i64 %tmp.i18.sum.i.i
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store i8 0, i8* %tmp17.i.i, align 1
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%tmp.i.i.i = getelementptr inbounds i8, i8* %tmp.i20.i.i, i64 8
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%1 = bitcast i8* %tmp.i.i.i to i8**
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store i8* null, i8** %1, align 8
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%tmp22.i = load %"struct.llvm::StringMapEntryBase"*, %"struct.llvm::StringMapEntryBase"** %tmp7.i, align 8
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%tmp24.i = icmp eq %"struct.llvm::StringMapEntryBase"* %tmp22.i, inttoptr (i64 -1 to %"struct.llvm::StringMapEntryBase"*)
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br i1 %tmp24.i, label %bb9.i, label %_ZN4llvm9StringMapIPvNS_15MallocAllocatorEE16GetOrCreateValueIS1_EERNS_14StringMapEntryIS1_EENS_9StringRefET_.exit
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bb6.i: ; preds = %entry
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%tmp16.i = bitcast %"struct.llvm::StringMapEntryBase"* %tmp8.i to %"struct.llvm::StringMapEntry<void*>"*
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ret %"struct.llvm::StringMapEntry<void*>"* %tmp16.i
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bb9.i: ; preds = %_ZN4llvm14StringMapEntryIPvE6CreateINS_15MallocAllocatorES1_EEPS2_PKcS7_RT_T0_.exit.i
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%tmp25.i = getelementptr inbounds %"struct.llvm::StringMap<void*,llvm::MallocAllocator>", %"struct.llvm::StringMap<void*,llvm::MallocAllocator>"* %this, i64 0, i32 0, i32 3
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%tmp26.i = load i32, i32* %tmp25.i, align 8
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%tmp27.i = add i32 %tmp26.i, -1
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store i32 %tmp27.i, i32* %tmp25.i, align 8
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ret %"struct.llvm::StringMapEntry<void*>"* %tmp10.i.i
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_ZN4llvm9StringMapIPvNS_15MallocAllocatorEE16GetOrCreateValueIS1_EERNS_14StringMapEntryIS1_EENS_9StringRefET_.exit: ; preds = %_ZN4llvm14StringMapEntryIPvE6CreateINS_15MallocAllocatorES1_EEPS2_PKcS7_RT_T0_.exit.i
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ret %"struct.llvm::StringMapEntry<void*>"* %tmp10.i.i
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}
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
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