1 # RUN: llc -march=amdgcn -mcpu=gfx900 -amdgpu-vgpr-index-mode -run-pass=greedy -stress-regalloc=16 -o - %s | FileCheck -check-prefixes=GCN %s
3 # An interval for a register that was partially defined was split, creating
4 # a new use (a COPY) which was reached by the undef point. In particular,
5 # there was a subrange of the new register which was reached by an "undef"
6 # point. When the code in extendSegmentsToUses verified value numbers between
7 # the new and the old live ranges, it did not account for this kind of a
8 # situation and asserted expecting the old value to exist. For a PHI node
9 # it is legal to have a missing predecessor value as long as the end of
10 # the predecessor is jointly dominated by the undefs.
12 # A simplified form of this can be illustrated as
15 # %0:vreg_64 = IMPLICIT_DEF
17 # S_CBRANCH_SCC1 %bb.2, implicit $vcc
21 # ; predecessors: %bb.1, %bb.4
22 # dead %1:vreg_64 = COPY %0:vreg_64 ; This is the point of the inserted split
27 # ; predecessors: %bb.1
28 # undef %0.sub0:vreg_64 = COPY %123:sreg_32 ; undef point for %0.sub1
33 # ; predecessors: %bb.4
37 # This test exposes this scenario which caused previously caused an assert
41 tracksRegLiveness: true
43 scratchRSrcReg: $sgpr0_sgpr1_sgpr2_sgpr3
44 stackPtrOffsetReg: $sgpr32
46 - { reg: '$vgpr2', virtual-reg: '%0' }
47 - { reg: '$vgpr3', virtual-reg: '%1' }
48 - { reg: '$vgpr4', virtual-reg: '%2' }
51 successors: %bb.1(0x40000000), %bb.2(0x40000000)
52 liveins: $vgpr2, $vgpr3, $vgpr4
53 %2:vgpr_32 = COPY $vgpr4
54 %1:vgpr_32 = COPY $vgpr3
55 %0:vgpr_32 = COPY $vgpr2
56 S_CBRANCH_SCC0 %bb.2, implicit undef $scc
59 successors: %bb.5(0x80000000)
60 undef %3.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
61 %3.sub1:vreg_128 = COPY %3.sub0
62 %3.sub2:vreg_128 = COPY %3.sub0
66 successors: %bb.3(0x40000000), %bb.4(0x40000000)
67 S_CBRANCH_SCC0 %bb.4, implicit undef $scc
70 successors: %bb.5(0x80000000)
71 undef %3.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
72 %3.sub1:vreg_128 = COPY %3.sub0
76 successors: %bb.5(0x80000000)
77 %3:vreg_128 = IMPLICIT_DEF
80 successors: %bb.6(0x40000000), %bb.22(0x40000000)
81 %4:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
82 S_CBRANCH_SCC1 %bb.22, implicit undef $scc
86 successors: %bb.8(0x40000000), %bb.11(0x40000000)
87 %5:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
88 dead %6:vgpr_32 = V_MUL_F32_e32 0, undef %7:vgpr_32, implicit $mode, implicit $exec
89 dead %8:vgpr_32 = V_MUL_F32_e32 0, %2, implicit $mode, implicit $exec
90 undef %9.sub1:vreg_64 = V_MUL_F32_e32 0, %1, implicit $mode, implicit $exec
91 undef %10.sub0:vreg_128 = V_MUL_F32_e32 0, %0, implicit $mode, implicit $exec
92 undef %11.sub0:sgpr_256 = S_MOV_B32 0
93 %11.sub1:sgpr_256 = COPY %11.sub0
94 %11.sub2:sgpr_256 = COPY %11.sub0
95 %11.sub3:sgpr_256 = COPY %11.sub0
96 %11.sub4:sgpr_256 = COPY %11.sub0
97 %11.sub5:sgpr_256 = COPY %11.sub0
98 %11.sub6:sgpr_256 = COPY %11.sub0
99 %11.sub7:sgpr_256 = COPY %11.sub0
100 %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)
101 %14:vgpr_32 = V_MOV_B32_e32 -1, implicit $exec
102 %15:vreg_128 = IMPLICIT_DEF
103 S_CBRANCH_SCC1 %bb.8, implicit undef $scc
107 successors: %bb.13(0x80000000)
110 ; GCN: undef %15.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
112 undef %15.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
113 %15.sub1:vreg_128 = COPY %15.sub0
114 %15.sub2:vreg_128 = COPY %15.sub0
115 %5:vgpr_32 = IMPLICIT_DEF
119 successors: %bb.9(0x40000000), %bb.10(0x40000000)
120 S_CBRANCH_SCC0 %bb.10, implicit undef $scc
123 successors: %bb.12(0x80000000)
126 ; GCN: undef %15.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
128 undef %15.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
129 %15.sub1:vreg_128 = COPY %15.sub0
130 %15.sub2:vreg_128 = COPY %15.sub0
134 successors: %bb.12(0x80000000)
137 ; GCN: undef %15.sub0:vreg_128 = V_MOV_B32_e32 2143289344, implicit $exec
139 undef %15.sub0:vreg_128 = V_MOV_B32_e32 2143289344, implicit $exec
140 %15.sub1:vreg_128 = COPY %15.sub0
141 %15.sub2:vreg_128 = COPY %15.sub0
145 successors: %bb.7(0x40000000), %bb.13(0x40000000)
146 %16:sreg_64 = V_CMP_NE_U32_e64 0, %14, implicit $exec
147 %17:sreg_64 = S_AND_B64 $exec, %16, implicit-def dead $scc
149 S_CBRANCH_VCCNZ %bb.7, implicit $vcc
153 successors: %bb.11(0x80000000)
154 %14:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
155 %5:vgpr_32 = V_MOV_B32_e32 -1, implicit $exec
159 successors: %bb.15(0x40000000), %bb.14(0x40000000)
161 %18:vgpr_32 = V_MAD_F32_e64 0, %10.sub0, 0, target-flags(amdgpu-gotprel) 1073741824, 0, -1082130432, 0, 0, implicit $mode, implicit $exec
162 %19:vgpr_32 = V_MAD_F32_e64 0, %12.sub0, 0, target-flags(amdgpu-gotprel) 0, 0, 0, 0, 0, implicit $mode, implicit $exec
163 %20:sgpr_128 = S_BUFFER_LOAD_DWORDX4_IMM undef %21:sgpr_128, 1040, 0 :: (dereferenceable invariant load (s128))
164 %22:vgpr_32 = V_ADD_F32_e32 0, %19, implicit $mode, implicit $exec
165 %23:vgpr_32 = V_MAD_F32_e64 0, %18, 0, 0, 0, 0, 0, 0, implicit $mode, implicit $exec
166 %24:vgpr_32 = COPY %20.sub3
167 %25:vgpr_32 = V_MUL_F32_e64 0, target-flags(amdgpu-gotprel32-lo) 0, 0, %20.sub1, 0, 0, implicit $mode, implicit $exec
168 %26:sgpr_128 = S_BUFFER_LOAD_DWORDX4_IMM undef %27:sgpr_128, 1056, 0 :: (dereferenceable invariant load (s128))
169 %28:vgpr_32 = V_MAD_F32_e64 0, %18, 0, %26.sub0, 0, 0, 0, 0, implicit $mode, implicit $exec
170 %29:vgpr_32 = V_ADD_F32_e32 %28, %19, implicit $mode, implicit $exec
171 %30:vgpr_32 = V_RCP_F32_e32 %29, implicit $mode, implicit $exec
172 %25:vgpr_32 = V_MAC_F32_e32 0, %18, %25, implicit $mode, implicit $exec
173 %31:vgpr_32 = V_MAD_F32_e64 0, target-flags(amdgpu-gotprel) 0, 0, %12.sub0, 0, %24, 0, 0, implicit $mode, implicit $exec
174 %32:vgpr_32 = V_ADD_F32_e32 %25, %31, implicit $mode, implicit $exec
175 %33:vgpr_32 = V_MUL_F32_e32 %22, %30, implicit $mode, implicit $exec
176 %34:vgpr_32 = V_MUL_F32_e32 %23, %30, implicit $mode, implicit $exec
177 %35:vgpr_32 = V_MUL_F32_e32 %32, %30, implicit $mode, implicit $exec
178 %36:vgpr_32 = V_MUL_F32_e32 0, %34, implicit $mode, implicit $exec
179 %36:vgpr_32 = V_MAC_F32_e32 0, %33, %36, implicit $mode, implicit $exec
180 %37:vgpr_32 = V_MAD_F32_e64 0, %35, 0, 0, 0, 0, 0, 0, implicit $mode, implicit $exec
181 %38:sreg_64_xexec = V_CMP_NE_U32_e64 0, %5, implicit $exec
182 %39:vgpr_32 = V_CNDMASK_B32_e64 0, 0, 0, 1, %38, implicit $exec
183 V_CMP_NE_U32_e32 1, %39, implicit-def $vcc, implicit $exec
184 $vcc = S_AND_B64 $exec, $vcc, implicit-def dead $scc
185 %40:vgpr_32 = V_ADD_F32_e32 %36, %37, implicit $mode, implicit $exec
186 S_CBRANCH_VCCZ %bb.15, implicit $vcc
189 successors: %bb.17(0x80000000)
193 successors: %bb.16(0x40000000), %bb.18(0x40000000)
194 %41:vgpr_32 = V_MAD_F32_e64 0, %40, 0, 0, 0, 0, 0, 0, implicit $mode, implicit $exec
195 %42:sreg_64 = V_CMP_LE_F32_e64 0, 0, 0, %41, 0, implicit $mode, implicit $exec
196 %43:sreg_64 = V_CMP_GE_F32_e64 0, 1065353216, 0, %41, 0, implicit $mode, implicit $exec
197 %44:sreg_64 = S_AND_B64 %43, %43, implicit-def dead $scc
198 %45:sreg_64 = S_AND_B64 %42, %42, implicit-def dead $scc
199 %46:sreg_64 = S_AND_B64 %45, %44, implicit-def dead $scc
200 %47:sreg_64 = COPY $exec, implicit-def $exec
201 %48:sreg_64 = S_AND_B64 %47, %46, implicit-def dead $scc
202 $exec = S_MOV_B64_term %48
203 S_CBRANCH_EXECZ %bb.18, implicit $exec
207 successors: %bb.18(0x80000000)
211 successors: %bb.21(0x40000000), %bb.23(0x40000000)
212 %49:sreg_64 = V_CMP_NE_U32_e64 0, %5, implicit $exec
213 %50:sreg_64 = S_AND_B64 $exec, %49, implicit-def dead $scc
214 %51:vreg_128 = IMPLICIT_DEF
216 S_CBRANCH_VCCNZ %bb.21, implicit $vcc
220 successors: %bb.20(0x40000000), %bb.19(0x40000000)
221 $exec = S_OR_B64 $exec, %47, implicit-def $scc
222 %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
223 %53:vgpr_32 = V_MUL_F32_e32 -2147483648, %3.sub1, implicit $mode, implicit $exec
224 %53:vgpr_32 = V_MAC_F32_e32 target-flags(amdgpu-gotprel32-hi) 1065353216, %3.sub2, %53, implicit $mode, implicit $exec
225 %54:vgpr_32 = V_MUL_F32_e32 %53, %53, implicit $mode, implicit $exec
226 %54:vgpr_32 = V_MAC_F32_e32 %52, %52, %54, implicit $mode, implicit $exec
227 %55:vgpr_32 = V_SQRT_F32_e32 %54, implicit $mode, implicit $exec
228 %5:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
229 %56:vgpr_32 = V_MOV_B32_e32 981668463, implicit $exec
230 %57:sreg_64 = V_CMP_NGT_F32_e64 0, %55, 0, %56, 0, implicit $mode, implicit $exec
231 %58:sreg_64 = S_AND_B64 $exec, %57, implicit-def dead $scc
233 S_CBRANCH_VCCZ %bb.20, implicit $vcc
236 successors: %bb.17(0x80000000)
240 successors: %bb.17(0x80000000)
244 successors: %bb.23(0x80000000)
245 %59:sreg_32 = S_MOV_B32 0
246 undef %51.sub0:vreg_128 = COPY %59
250 successors: %bb.24(0x80000000)
254 successors: %bb.22(0x80000000)
255 undef %60.sub1:vreg_64 = V_CVT_I32_F32_e32 %1, implicit $mode, implicit $exec
256 %60.sub0:vreg_64 = V_CVT_I32_F32_e32 %0, implicit $mode, implicit $exec
257 undef %61.sub0:sgpr_256 = S_MOV_B32 0
258 %61.sub1:sgpr_256 = COPY %61.sub0
259 %61.sub2:sgpr_256 = COPY %61.sub0
260 %61.sub3:sgpr_256 = COPY %61.sub0
261 %61.sub4:sgpr_256 = COPY %61.sub0
262 %61.sub5:sgpr_256 = COPY %61.sub0
263 %61.sub6:sgpr_256 = COPY %61.sub0
264 %61.sub7:sgpr_256 = COPY %61.sub0
265 %62:vgpr_32 = V_MOV_B32_e32 1033100696, implicit $exec
266 %63:vgpr_32 = V_MUL_F32_e32 1060575065, %15.sub1, implicit $mode, implicit $exec
267 %63:vgpr_32 = V_MAC_F32_e32 1046066128, %15.sub0, %63, implicit $mode, implicit $exec
268 %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)
269 %64:vgpr_32 = V_MAC_F32_e32 target-flags(amdgpu-gotprel) 0, %51.sub0, %64, implicit $mode, implicit $exec
270 %65:vgpr_32 = V_MUL_F32_e32 0, %64, implicit $mode, implicit $exec
271 %66:vgpr_32 = V_MUL_F32_e32 0, %65, implicit $mode, implicit $exec
272 %67:vgpr_32 = V_MAD_F32_e64 0, %66, 0, %62, 0, 0, 0, 0, implicit $mode, implicit $exec
273 %63:vgpr_32 = V_MAC_F32_e32 %15.sub2, %62, %63, implicit $mode, implicit $exec
274 %4:vgpr_32 = V_ADD_F32_e32 %63, %67, implicit $mode, implicit $exec
278 %68:vgpr_32 = V_MUL_F32_e32 0, %4, implicit $mode, implicit $exec
279 %69:vgpr_32 = V_CVT_PKRTZ_F16_F32_e64 0, undef %70:vgpr_32, 0, %68, 0, 0, implicit $mode, implicit $exec
280 EXP 0, undef %71:vgpr_32, %69, undef %72:vgpr_32, undef %73:vgpr_32, -1, -1, 15, implicit $exec