llvm-project/llvm/test/CodeGen/X86/2006-11-17-IllegalMove.ll

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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
2009-07-12 08:46:16 +08:00
define void @handle_vector_size_attribute() nounwind {
; CHECK-LABEL: handle_vector_size_attribute:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: movl 0, %eax
; CHECK-NEXT: decl %eax
Generalize MergeBlockIntoPredecessor. Replace uses of MergeBasicBlockIntoOnlyPred. Summary: Two utils methods have essentially the same functionality. This is an attempt to merge them into one. 1. lib/Transforms/Utils/Local.cpp : MergeBasicBlockIntoOnlyPred 2. lib/Transforms/Utils/BasicBlockUtils.cpp : MergeBlockIntoPredecessor Prior to the patch: 1. MergeBasicBlockIntoOnlyPred Updates either DomTree or DeferredDominance Moves all instructions from Pred to BB, deletes Pred Asserts BB has single predecessor If address was taken, replace the block address with constant 1 (?) 2. MergeBlockIntoPredecessor Updates DomTree, LoopInfo and MemoryDependenceResults Moves all instruction from BB to Pred, deletes BB Returns if doesn't have a single predecessor Returns if BB's address was taken After the patch: Method 2. MergeBlockIntoPredecessor is attempting to become the new default: Updates DomTree or DeferredDominance, and LoopInfo and MemoryDependenceResults Moves all instruction from BB to Pred, deletes BB Returns if doesn't have a single predecessor Returns if BB's address was taken Uses of MergeBasicBlockIntoOnlyPred that need to be replaced: 1. lib/Transforms/Scalar/LoopSimplifyCFG.cpp Updated in this patch. No challenges. 2. lib/CodeGen/CodeGenPrepare.cpp Updated in this patch. i. eliminateFallThrough is straightforward, but I added using a temporary array to avoid the iterator invalidation. ii. eliminateMostlyEmptyBlock(s) methods also now use a temporary array for blocks Some interesting aspects: - Since Pred is not deleted (BB is), the entry block does not need updating. - The entry block was being updated with the deleted block in eliminateMostlyEmptyBlock. Added assert to make obvious that BB=SinglePred. - isMergingEmptyBlockProfitable assumes BB is the one to be deleted. - eliminateMostlyEmptyBlock(BB) does not delete BB on one path, it deletes its unique predecessor instead. - adding some test owner as subscribers for the interesting tests modified: test/CodeGen/X86/avx-cmp.ll test/CodeGen/AMDGPU/nested-loop-conditions.ll test/CodeGen/AMDGPU/si-annotate-cf.ll test/CodeGen/X86/hoist-spill.ll test/CodeGen/X86/2006-11-17-IllegalMove.ll 3. lib/Transforms/Scalar/JumpThreading.cpp Not covered in this patch. It is the only use case using the DeferredDominance. I would defer to Brian Rzycki to make this replacement. Reviewers: chandlerc, spatel, davide, brzycki, bkramer, javed.absar Subscribers: qcolombet, sanjoy, nemanjai, nhaehnle, jlebar, tpr, kbarton, RKSimon, wmi, arsenm, llvm-commits Differential Revision: https://reviews.llvm.org/D48202 llvm-svn: 335183
2018-06-21 06:01:04 +08:00
; CHECK-NEXT: cmpl $1, %eax
; CHECK-NEXT: ja .LBB0_2
; CHECK-NEXT: # %bb.1: # %bb77
; CHECK-NEXT: movb 0, %al
; CHECK-NEXT: movzbl %al, %eax
; CHECK-NEXT: # kill: def $eax killed $eax def $ax
; CHECK-NEXT: divb %al
; CHECK-NEXT: movzbl %al, %eax
; CHECK-NEXT: cmpq %rax, %rax
; CHECK-NEXT: .LBB0_2: # %bb84
; CHECK-NEXT: retq
entry:
%tmp69 = load i32, i32* null ; <i32> [#uses=1]
switch i32 %tmp69, label %bb84 [
i32 2, label %bb77
i32 1, label %bb77
]
bb77: ; preds = %entry, %entry
%tmp99 = udiv i64 0, 0 ; <i64> [#uses=1]
%tmp = load i8, i8* null ; <i8> [#uses=1]
%tmp114 = icmp eq i64 0, 0 ; <i1> [#uses=1]
br label %cond_true115
bb84: ; preds = %entry
ret void
cond_true115: ; preds = %bb77
%tmp118 = load i8, i8* null ; <i8> [#uses=1]
br label %cond_true120
cond_true120: ; preds = %cond_true115
%tmp127 = udiv i8 %tmp, %tmp118 ; <i8> [#uses=1]
%tmp127.upgrd.1 = zext i8 %tmp127 to i64 ; <i64> [#uses=1]
br label %cond_next129
cond_next129: ; preds = %cond_true120, %cond_true115
%iftmp.30.0 = phi i64 [ %tmp127.upgrd.1, %cond_true120 ] ; <i64> [#uses=1]
%tmp132 = icmp eq i64 %iftmp.30.0, %tmp99 ; <i1> [#uses=1]
br i1 %tmp132, label %cond_false148, label %cond_next136
cond_next136: ; preds = %cond_next129, %bb77
ret void
cond_false148: ; preds = %cond_next129
ret void
}