# RUN: llc -mtriple=amdgcn -mcpu=gfx900 -amdgpu-vgpr-index-mode -run-pass=greedy -stress-regalloc=16 -o - %s | FileCheck -check-prefixes=GCN %s
# An interval for a register that was partially defined was split, creating
# a new use (a COPY) which was reached by the undef point. In particular,
# there was a subrange of the new register which was reached by an "undef"
# point. When the code in extendSegmentsToUses verified value numbers between
# the new and the old live ranges, it did not account for this kind of a
# situation and asserted expecting the old value to exist. For a PHI node
# it is legal to have a missing predecessor value as long as the end of
# the predecessor is jointly dominated by the undefs.
#
# A simplified form of this can be illustrated as
#
# bb.1:
# %0:vreg_64 = IMPLICIT_DEF
# ...
# S_CBRANCH_SCC1 %bb.2, implicit $vcc
# S_BRANCH %bb.3
#
# bb.2:
# ; predecessors: %bb.1, %bb.4
# dead %1:vreg_64 = COPY %0:vreg_64 ; This is the point of the inserted split
# ...
# S_BRANCH %bb.5
#
# bb.3:
# ; predecessors: %bb.1
# undef %0.sub0:vreg_64 = COPY %123:sreg_32 ; undef point for %0.sub1
# ...
# S_BRANCH %bb.4
#
# bb.4
# ; predecessors: %bb.4
# ...
# S_BRANCH %bb.2
#
# This test exposes this scenario which caused previously caused an assert
---
name: _amdgpu_ps_main
tracksRegLiveness: true
machineFunctionInfo:
scratchRSrcReg: $sgpr0_sgpr1_sgpr2_sgpr3
stackPtrOffsetReg: $sgpr32
liveins:
- { reg: '$vgpr2', virtual-reg: '%0' }
- { reg: '$vgpr3', virtual-reg: '%1' }
- { reg: '$vgpr4', virtual-reg: '%2' }
body: |
bb.0:
successors: %bb.1(0x40000000), %bb.2(0x40000000)
liveins: $vgpr2, $vgpr3, $vgpr4
%2:vgpr_32 = COPY $vgpr4
%1:vgpr_32 = COPY $vgpr3
%0:vgpr_32 = COPY $vgpr2
S_CBRANCH_SCC0 %bb.2, implicit undef $scc
bb.1:
successors: %bb.5(0x80000000)
undef %3.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
%3.sub1:vreg_128 = COPY %3.sub0
%3.sub2:vreg_128 = COPY %3.sub0
S_BRANCH %bb.5
bb.2:
successors: %bb.3(0x40000000), %bb.4(0x40000000)
S_CBRANCH_SCC0 %bb.4, implicit undef $scc
bb.3:
successors: %bb.5(0x80000000)
undef %3.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
%3.sub1:vreg_128 = COPY %3.sub0
S_BRANCH %bb.5
bb.4:
successors: %bb.5(0x80000000)
%3:vreg_128 = IMPLICIT_DEF
bb.5:
successors: %bb.6(0x40000000), %bb.22(0x40000000)
%4:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
S_CBRANCH_SCC1 %bb.22, implicit undef $scc
S_BRANCH %bb.6
bb.6:
successors: %bb.8(0x40000000), %bb.11(0x40000000)
%5:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
dead %6:vgpr_32 = V_MUL_F32_e32 0, undef %7:vgpr_32, implicit $mode, implicit $exec
dead %8:vgpr_32 = V_MUL_F32_e32 0, %2, implicit $mode, implicit $exec
undef %9.sub1:vreg_64 = V_MUL_F32_e32 0, %1, implicit $mode, implicit $exec
undef %10.sub0:vreg_128 = V_MUL_F32_e32 0, %0, implicit $mode, implicit $exec
undef %11.sub0:sgpr_256 = S_MOV_B32 0
%11.sub1:sgpr_256 = COPY %11.sub0
%11.sub2:sgpr_256 = COPY %11.sub0
%11.sub3:sgpr_256 = COPY %11.sub0
%11.sub4:sgpr_256 = COPY %11.sub0
%11.sub5:sgpr_256 = COPY %11.sub0
%11.sub6:sgpr_256 = COPY %11.sub0
%11.sub7:sgpr_256 = COPY %11.sub0
%12:vreg_128 = IMAGE_SAMPLE_LZ_V4_V2 %9, %11, undef %13:sgpr_128, 15, 0, 0, 0, 0, 0, 0, 0, implicit $exec :: (dereferenceable load (s128) from constant-pool, addrspace 4)
%14:vgpr_32 = V_MOV_B32_e32 -1, implicit $exec
%15:vreg_128 = IMPLICIT_DEF
S_CBRANCH_SCC1 %bb.8, implicit undef $scc
S_BRANCH %bb.11
bb.7:
successors: %bb.13(0x80000000)
; GCN-LABEL: bb.7:
; GCN: undef %15.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
undef %15.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
%15.sub1:vreg_128 = COPY %15.sub0
%15.sub2:vreg_128 = COPY %15.sub0
%5:vgpr_32 = IMPLICIT_DEF
S_BRANCH %bb.13
bb.8:
successors: %bb.9(0x40000000), %bb.10(0x40000000)
S_CBRANCH_SCC0 %bb.10, implicit undef $scc
bb.9:
successors: %bb.12(0x80000000)
; GCN-LABEL: bb.9:
; GCN: undef %15.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
undef %15.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
%15.sub1:vreg_128 = COPY %15.sub0
%15.sub2:vreg_128 = COPY %15.sub0
S_BRANCH %bb.12
bb.10:
successors: %bb.12(0x80000000)
; GCN-LABEL: bb.10:
; GCN: undef %15.sub0:vreg_128 = V_MOV_B32_e32 2143289344, implicit $exec
undef %15.sub0:vreg_128 = V_MOV_B32_e32 2143289344, implicit $exec
%15.sub1:vreg_128 = COPY %15.sub0
%15.sub2:vreg_128 = COPY %15.sub0
S_BRANCH %bb.12
bb.11:
successors: %bb.7(0x40000000), %bb.13(0x40000000)
%16:sreg_64 = V_CMP_NE_U32_e64 0, %14, implicit $exec
%17:sreg_64 = S_AND_B64 $exec, %16, implicit-def dead $scc
$vcc = COPY %17
S_CBRANCH_VCCNZ %bb.7, implicit $vcc
S_BRANCH %bb.13
bb.12:
successors: %bb.11(0x80000000)
%14:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
%5:vgpr_32 = V_MOV_B32_e32 -1, implicit $exec
S_BRANCH %bb.11
bb.13:
successors: %bb.15(0x40000000), %bb.14(0x40000000)
%18:vgpr_32 = V_MAD_F32_e64 0, %10.sub0, 0, target-flags(amdgpu-gotprel) 1073741824, 0, -1082130432, 0, 0, implicit $mode, implicit $exec
%19:vgpr_32 = V_MAD_F32_e64 0, %12.sub0, 0, target-flags(amdgpu-gotprel) 0, 0, 0, 0, 0, implicit $mode, implicit $exec
%20:sgpr_128 = S_BUFFER_LOAD_DWORDX4_IMM undef %21:sgpr_128, 1040, 0 :: (dereferenceable invariant load (s128))
%22:vgpr_32 = V_ADD_F32_e32 0, %19, implicit $mode, implicit $exec
%23:vgpr_32 = V_MAD_F32_e64 0, %18, 0, 0, 0, 0, 0, 0, implicit $mode, implicit $exec
%24:vgpr_32 = COPY %20.sub3
%25:vgpr_32 = V_MUL_F32_e64 0, target-flags(amdgpu-gotprel32-lo) 0, 0, %20.sub1, 0, 0, implicit $mode, implicit $exec
%26:sgpr_128 = S_BUFFER_LOAD_DWORDX4_IMM undef %27:sgpr_128, 1056, 0 :: (dereferenceable invariant load (s128))
%28:vgpr_32 = V_MAD_F32_e64 0, %18, 0, %26.sub0, 0, 0, 0, 0, implicit $mode, implicit $exec
%29:vgpr_32 = V_ADD_F32_e32 %28, %19, implicit $mode, implicit $exec
%30:vgpr_32 = V_RCP_F32_e32 %29, implicit $mode, implicit $exec
%25:vgpr_32 = V_MAC_F32_e32 0, %18, %25, implicit $mode, implicit $exec
%31:vgpr_32 = V_MAD_F32_e64 0, target-flags(amdgpu-gotprel) 0, 0, %12.sub0, 0, %24, 0, 0, implicit $mode, implicit $exec
%32:vgpr_32 = V_ADD_F32_e32 %25, %31, implicit $mode, implicit $exec
%33:vgpr_32 = V_MUL_F32_e32 %22, %30, implicit $mode, implicit $exec
%34:vgpr_32 = V_MUL_F32_e32 %23, %30, implicit $mode, implicit $exec
%35:vgpr_32 = V_MUL_F32_e32 %32, %30, implicit $mode, implicit $exec
%36:vgpr_32 = V_MUL_F32_e32 0, %34, implicit $mode, implicit $exec
%36:vgpr_32 = V_MAC_F32_e32 0, %33, %36, implicit $mode, implicit $exec
%37:vgpr_32 = V_MAD_F32_e64 0, %35, 0, 0, 0, 0, 0, 0, implicit $mode, implicit $exec
%38:sreg_64_xexec = V_CMP_NE_U32_e64 0, %5, implicit $exec
%39:vgpr_32 = V_CNDMASK_B32_e64 0, 0, 0, 1, %38, implicit $exec
V_CMP_NE_U32_e32 1, %39, implicit-def $vcc, implicit $exec
$vcc = S_AND_B64 $exec, $vcc, implicit-def dead $scc
%40:vgpr_32 = V_ADD_F32_e32 %36, %37, implicit $mode, implicit $exec
S_CBRANCH_VCCZ %bb.15, implicit $vcc
bb.14:
successors: %bb.17(0x80000000)
S_BRANCH %bb.17
bb.15:
successors: %bb.16(0x40000000), %bb.18(0x40000000)
%41:vgpr_32 = V_MAD_F32_e64 0, %40, 0, 0, 0, 0, 0, 0, implicit $mode, implicit $exec
%42:sreg_64 = V_CMP_LE_F32_e64 0, 0, 0, %41, 0, implicit $mode, implicit $exec
%43:sreg_64 = V_CMP_GE_F32_e64 0, 1065353216, 0, %41, 0, implicit $mode, implicit $exec
%44:sreg_64 = S_AND_B64 %43, %43, implicit-def dead $scc
%45:sreg_64 = S_AND_B64 %42, %42, implicit-def dead $scc
%46:sreg_64 = S_AND_B64 %45, %44, implicit-def dead $scc
%47:sreg_64 = COPY $exec, implicit-def $exec
%48:sreg_64 = S_AND_B64 %47, %46, implicit-def dead $scc
$exec = S_MOV_B64_term %48
S_CBRANCH_EXECZ %bb.18, implicit $exec
S_BRANCH %bb.16
bb.16:
successors: %bb.18(0x80000000)
S_BRANCH %bb.18
bb.17:
successors: %bb.21(0x40000000), %bb.23(0x40000000)
%49:sreg_64 = V_CMP_NE_U32_e64 0, %5, implicit $exec
%50:sreg_64 = S_AND_B64 $exec, %49, implicit-def dead $scc
%51:vreg_128 = IMPLICIT_DEF
$vcc = COPY %50
S_CBRANCH_VCCNZ %bb.21, implicit $vcc
S_BRANCH %bb.23
bb.18:
successors: %bb.20(0x40000000), %bb.19(0x40000000)
$exec = S_OR_B64 $exec, %47, implicit-def $scc
%52:vgpr_32 = V_MAD_F32_e64 0, %3.sub1, 0, target-flags(amdgpu-gotprel32-lo) 0, 1, %3.sub0, 0, 0, implicit $mode, implicit $exec
%53:vgpr_32 = V_MUL_F32_e32 -2147483648, %3.sub1, implicit $mode, implicit $exec
%53:vgpr_32 = V_MAC_F32_e32 target-flags(amdgpu-gotprel32-hi) 1065353216, %3.sub2, %53, implicit $mode, implicit $exec
%54:vgpr_32 = V_MUL_F32_e32 %53, %53, implicit $mode, implicit $exec
%54:vgpr_32 = V_MAC_F32_e32 %52, %52, %54, implicit $mode, implicit $exec
%55:vgpr_32 = V_SQRT_F32_e32 %54, implicit $mode, implicit $exec
%5:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
%56:vgpr_32 = V_MOV_B32_e32 981668463, implicit $exec
%57:sreg_64 = V_CMP_NGT_F32_e64 0, %55, 0, %56, 0, implicit $mode, implicit $exec
%58:sreg_64 = S_AND_B64 $exec, %57, implicit-def dead $scc
$vcc = COPY %58
S_CBRANCH_VCCZ %bb.20, implicit $vcc
bb.19:
successors: %bb.17(0x80000000)
S_BRANCH %bb.17
bb.20:
successors: %bb.17(0x80000000)
S_BRANCH %bb.17
bb.21:
successors: %bb.23(0x80000000)
%59:sreg_32 = S_MOV_B32 0
undef %51.sub0:vreg_128 = COPY %59
S_BRANCH %bb.23
bb.22:
successors: %bb.24(0x80000000)
S_BRANCH %bb.24
bb.23:
successors: %bb.22(0x80000000)
undef %60.sub1:vreg_64 = V_CVT_I32_F32_e32 %1, implicit $mode, implicit $exec
%60.sub0:vreg_64 = V_CVT_I32_F32_e32 %0, implicit $mode, implicit $exec
undef %61.sub0:sgpr_256 = S_MOV_B32 0
%61.sub1:sgpr_256 = COPY %61.sub0
%61.sub2:sgpr_256 = COPY %61.sub0
%61.sub3:sgpr_256 = COPY %61.sub0
%61.sub4:sgpr_256 = COPY %61.sub0
%61.sub5:sgpr_256 = COPY %61.sub0
%61.sub6:sgpr_256 = COPY %61.sub0
%61.sub7:sgpr_256 = COPY %61.sub0
%62:vgpr_32 = V_MOV_B32_e32 1033100696, implicit $exec
%63:vgpr_32 = V_MUL_F32_e32 1060575065, %15.sub1, implicit $mode, implicit $exec
%63:vgpr_32 = V_MAC_F32_e32 1046066128, %15.sub0, %63, implicit $mode, implicit $exec
%64:vgpr_32 = IMAGE_LOAD_V1_V2 %60, %61, 1, -1, 0, 0, 0, 0, 0, 0, implicit $exec :: (dereferenceable load (s128) from constant-pool, addrspace 4)
%64:vgpr_32 = V_MAC_F32_e32 target-flags(amdgpu-gotprel) 0, %51.sub0, %64, implicit $mode, implicit $exec
%65:vgpr_32 = V_MUL_F32_e32 0, %64, implicit $mode, implicit $exec
%66:vgpr_32 = V_MUL_F32_e32 0, %65, implicit $mode, implicit $exec
%67:vgpr_32 = V_MAD_F32_e64 0, %66, 0, %62, 0, 0, 0, 0, implicit $mode, implicit $exec
%63:vgpr_32 = V_MAC_F32_e32 %15.sub2, %62, %63, implicit $mode, implicit $exec
%4:vgpr_32 = V_ADD_F32_e32 %63, %67, implicit $mode, implicit $exec
S_BRANCH %bb.22
bb.24:
%68:vgpr_32 = V_MUL_F32_e32 0, %4, implicit $mode, implicit $exec
%69:vgpr_32 = V_CVT_PKRTZ_F16_F32_e64 0, undef %70:vgpr_32, 0, %68, 0, 0, implicit $mode, implicit $exec
EXP 0, undef %71:vgpr_32, %69, undef %72:vgpr_32, undef %73:vgpr_32, -1, -1, 15, implicit $exec
S_ENDPGM 0
...
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