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
67 lines
1.7 KiB
LLVM
67 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=powerpc64le -mcpu=pwr9 -verify-machineinstrs -disable-cgp-delete-phis < %s | FileCheck %s
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define double @zot(ptr %arg, ptr %arg1, ptr %arg2) {
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; CHECK-LABEL: zot:
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; CHECK: # %bb.0: # %bb
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; CHECK-NEXT: bc 12, 20, .LBB0_2
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; CHECK-NEXT: # %bb.1: # %bb3
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; CHECK-NEXT: lhz 5, 0(5)
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; CHECK-NEXT: rlwinm. 5, 5, 28, 30, 31
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; CHECK-NEXT: .LBB0_2: # %bb10
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; CHECK-NEXT: lfs 0, 0(4)
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; CHECK-NEXT: lwz 3, 0(3)
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; CHECK-NEXT: li 4, 2
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; CHECK-NEXT: fmr 1, 0
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; CHECK-NEXT: b .LBB0_4
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; CHECK-NEXT: .p2align 5
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; CHECK-NEXT: .LBB0_3: # %bb17
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; CHECK-NEXT: #
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; CHECK-NEXT: addi 4, 4, 1
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; CHECK-NEXT: .LBB0_4: # %bb17
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; CHECK-NEXT: #
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; CHECK-NEXT: cmpw 4, 3
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; CHECK-NEXT: bge 0, .LBB0_3
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; CHECK-NEXT: # %bb.5:
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; CHECK-NEXT: xsmuldp 1, 1, 0
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; CHECK-NEXT: b .LBB0_3
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bb:
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%tmp = load i32, ptr %arg, align 8
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br i1 undef, label %bb9, label %bb3
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bb3:
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%tmp4 = load i16, ptr %arg2, align 4
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%tmp5 = lshr i16 %tmp4, 4
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%tmp6 = and i16 %tmp5, 3
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%tmp7 = zext i16 %tmp6 to i32
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%tmp8 = icmp eq i16 %tmp6, 0
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br i1 %tmp8, label %bb9, label %bb10
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bb9:
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br label %bb10
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bb10:
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%tmp11 = phi i32 [ undef, %bb9 ], [ %tmp7, %bb3 ]
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%tmp12 = icmp sgt i32 %tmp11, 1
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br label %bb13
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bb13:
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%tmp14 = load float, ptr %arg1, align 4
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%tmp15 = fpext float %tmp14 to double
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br label %bb16
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bb16:
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br label %bb17
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bb17:
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%tmp18 = phi i32 [ %tmp23, %bb17 ], [ 2, %bb16 ]
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%tmp19 = phi double [ %tmp22, %bb17 ], [ %tmp15, %bb16 ]
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%tmp20 = icmp slt i32 %tmp18, %tmp
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%tmp21 = fmul fast double %tmp19, %tmp15
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%tmp22 = select i1 %tmp20, double %tmp21, double %tmp19
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%tmp23 = add nuw i32 %tmp18, 1
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br label %bb17
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}
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declare double @ham()
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