a701b7e368
Before elimination of mostly empty block it makes sense to remove dead PHI nodes. It open more opportunity for elimination plus eliminates dead code itself. It appeared that change results in failing many unit tests and some of them I've updated and for another one I disable this optimization. The pattern I observed in the tests is that there is a infinite loop without side effects. As a result after elimination of dead phi node all other related instruction are also removed and tests stops to check what it is expected. Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D158503
107 lines
3.8 KiB
LLVM
107 lines
3.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s --check-prefix=X86
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=X64
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@s_0 = external dso_local local_unnamed_addr global i16, align 2
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@s_2 = external dso_local local_unnamed_addr global i16, align 2
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define void @func_6(i8 %uc_8, i64 %uli_10) nounwind {
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; X86-LABEL: func_6:
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; X86: # %bb.0: # %entry
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; X86-NEXT: pushl %ebx
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; X86-NEXT: pushl %esi
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; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
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; X86-NEXT: movl $-1, %ecx
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; X86-NEXT: xorl %edx, %edx
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; X86-NEXT: xorl %ebx, %ebx
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; X86-NEXT: # implicit-def: $si
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; X86-NEXT: .p2align 4, 0x90
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; X86-NEXT: .LBB0_1: # %for.body612
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; X86-NEXT: # =>This Inner Loop Header: Depth=1
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; X86-NEXT: testb %dl, %dl
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; X86-NEXT: je .LBB0_2
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; X86-NEXT: # %bb.3: # %if.end1401
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; X86-NEXT: # in Loop: Header=BB0_1 Depth=1
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; X86-NEXT: addl %eax, %esi
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; X86-NEXT: movw %si, s_2
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; X86-NEXT: movw %bx, s_0
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; X86-NEXT: incl %ecx
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; X86-NEXT: incl %ebx
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; X86-NEXT: cmpw $73, %cx
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; X86-NEXT: jl .LBB0_1
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; X86-NEXT: # %bb.4: # %for.body1703
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; X86-NEXT: .LBB0_2: # %if.then671
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;
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; X64-LABEL: func_6:
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; X64: # %bb.0: # %entry
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; X64-NEXT: movl $23090, %eax # imm = 0x5A32
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; X64-NEXT: xorl %ecx, %ecx
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; X64-NEXT: # implicit-def: $dx
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; X64-NEXT: .p2align 4, 0x90
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; X64-NEXT: .LBB0_1: # %for.body612
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; X64-NEXT: # =>This Inner Loop Header: Depth=1
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; X64-NEXT: testb %cl, %cl
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; X64-NEXT: je .LBB0_2
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; X64-NEXT: # %bb.3: # %if.end1401
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; X64-NEXT: # in Loop: Header=BB0_1 Depth=1
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; X64-NEXT: addl %esi, %edx
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; X64-NEXT: movw %dx, s_2(%rip)
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; X64-NEXT: leal -23090(%rax), %edi
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; X64-NEXT: movw %di, s_0(%rip)
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; X64-NEXT: incq %rax
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; X64-NEXT: leal -23091(%rax), %edi
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; X64-NEXT: cmpw $73, %di
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; X64-NEXT: jl .LBB0_1
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; X64-NEXT: # %bb.4: # %for.body1703
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; X64-NEXT: .LBB0_2: # %if.then671
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entry:
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%conv649 = zext i8 %uc_8 to i64
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%xor650 = xor i64 %conv649, 296357731680175678
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%i = trunc i64 %uli_10 to i16
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br label %for.body612
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for.body612: ; preds = %for.inc1677, %entry
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%i1 = phi i16 [ undef, %entry ], [ %conv1532, %for.inc1677 ]
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%i2 = phi i16 [ -1, %entry ], [ %add1679, %for.inc1677 ]
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br label %if.then635
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if.then635: ; preds = %for.body612
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%conv653 = sext i16 %i2 to i64
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%cmp654.not = icmp eq i64 %xor650, %conv653
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%conv653.op = xor i64 %conv653, 296357731680175678
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%tobool670.not = icmp eq i64 undef, 0
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br i1 %tobool670.not, label %if.end1401, label %if.then671
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if.then671: ; preds = %if.then635
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%cmp830 = icmp sgt i16 %i1, 21
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unreachable
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if.end1401: ; preds = %if.then635
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%conv1421 = sext i16 %i2 to i32
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%or1422 = or i32 %conv1421, undef
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br label %if.end1510
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if.end1510: ; preds = %if.end1401
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br i1 undef, label %cond.false1514, label %cond.end1528
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cond.false1514: ; preds = %if.end1510
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%conv1525 = sext i16 %i2 to i64
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%add1526 = add nsw i64 %conv1525, 23091
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br label %cond.end1528
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cond.end1528: ; preds = %cond.false1514, %if.end1510
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%cond1529 = phi i64 [ %add1526, %cond.false1514 ], [ undef, %if.end1510 ]
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%conv1532 = add i16 %i1, %i
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store i16 %conv1532, ptr @s_2, align 2
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br label %for.inc1677
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for.inc1677: ; preds = %cond.end1528
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%add1679 = add i16 %i2, 1
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store i16 %add1679, ptr @s_0, align 2
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%cmp610 = icmp slt i16 %add1679, 73
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br i1 %cmp610, label %for.body612, label %for.body1703
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for.body1703: ; preds = %for.inc1677
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unreachable
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}
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