[AMDGPU] Emit CFI when spilling SGPR to memory

I think this was probably just caused by a bad merge, added a test.
Fixes SWDEV-457882

Change-Id: I763ece92e55630f3a8f57616c6ee8957cd845119

Author: epilk

llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp

@@ -2242,7 +2242,7 @@ bool SIRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator MI,
     case AMDGPU::SI_SPILL_S96_SAVE:
     case AMDGPU::SI_SPILL_S64_SAVE:
     case AMDGPU::SI_SPILL_S32_SAVE: {
-      return spillSGPR(MI, Index, RS);
+      return spillSGPR(MI, Index, RS, nullptr, nullptr, false, false, NeedsCFI);
     }
 
     // SGPR register restore

llvm/test/CodeGen/AMDGPU/amdgpu-spill-cfi-saved-regs.ll

@@ -137,10 +137,65 @@ define void @callee_need_to_spill_fp_exec_to_memory() #2 {
   ret void
 }
 
+define internal void @caller_needs_to_spill_pc_to_memory() #3 {
+  call void asm sideeffect "; clobber all VGPRs",
+  "~{v0},~{v1},~{v2},~{v3},~{v4},~{v5},~{v6},~{v7},~{v8},~{v9}
+  ,~{v10},~{v11},~{v12},~{v13},~{v14},~{v15},~{v16},~{v17},~{v18},~{v19}
+  ,~{v20},~{v21},~{v22},~{v23},~{v24},~{v25},~{v26},~{v27},~{v28},~{v29}
+  ,~{v30},~{v31},~{v32},~{v33},~{v34},~{v35},~{v36},~{v37},~{v38},~{v39}
+  ,~{v40},~{v41},~{v42},~{v43},~{v44},~{v45},~{v46},~{v47},~{v48},~{v49}
+  ,~{v50},~{v51},~{v52},~{v53},~{v54},~{v55},~{v56},~{v57},~{v58},~{v59}
+  ,~{v60},~{v61},~{v62},~{v63},~{v64},~{v65},~{v66},~{v67},~{v68},~{v69}
+  ,~{v70},~{v71},~{v72},~{v73},~{v74},~{v75},~{v76},~{v77},~{v78},~{v79}
+  ,~{v80},~{v81},~{v82},~{v83},~{v84},~{v85},~{v86},~{v87},~{v88},~{v89}
+  ,~{v90},~{v91},~{v92},~{v93},~{v94},~{v95},~{v96},~{v97},~{v98},~{v99}
+  ,~{v100},~{v101},~{v102},~{v103},~{v104},~{v105},~{v106},~{v107},~{v108},~{v109}
+  ,~{v110},~{v111},~{v112},~{v113},~{v114},~{v115},~{v116},~{v117},~{v118},~{v119}
+  ,~{v120},~{v121},~{v122},~{v123},~{v124},~{v125},~{v126},~{v127},~{v128},~{v129}
+  ,~{v130},~{v131},~{v132},~{v133},~{v134},~{v135},~{v136},~{v137},~{v138},~{v139}
+  ,~{v140},~{v141},~{v142},~{v143},~{v144},~{v145},~{v146},~{v147},~{v148},~{v149}
+  ,~{v150},~{v151},~{v152},~{v153},~{v154},~{v155},~{v156},~{v157},~{v158},~{v159}
+  ,~{v160},~{v161},~{v162},~{v163},~{v164},~{v165},~{v166},~{v167},~{v168},~{v169}
+  ,~{v170},~{v171},~{v172},~{v173},~{v174},~{v175},~{v176},~{v177},~{v178},~{v179}
+  ,~{v180},~{v181},~{v182},~{v183},~{v184},~{v185},~{v186},~{v187},~{v188},~{v189}
+  ,~{v190},~{v191},~{v192},~{v193},~{v194},~{v195},~{v196},~{v197},~{v198},~{v199}
+  ,~{v200},~{v201},~{v202},~{v203},~{v204},~{v205},~{v206},~{v207},~{v208},~{v209}
+  ,~{v210},~{v211},~{v212},~{v213},~{v214},~{v215},~{v216},~{v217},~{v218},~{v219}
+  ,~{v220},~{v221},~{v222},~{v223},~{v224},~{v225},~{v226},~{v227},~{v228},~{v229}
+  ,~{v230},~{v231},~{v232},~{v233},~{v234},~{v235},~{v236},~{v237},~{v238},~{v239}
+  ,~{v240},~{v241},~{v242},~{v243},~{v244},~{v245},~{v246},~{v247},~{v248},~{v249}
+  ,~{v250},~{v251},~{v252},~{v253},~{v254},~{v255}" () #3
+  ret void
+}
+
+; WAVE64-LABEL: need_to_spill_pc_to_mem:
+; WAVE64:      s_mov_b64 exec, 3
+; WAVE64-NEXT: buffer_store_dword [[TEMP_VGPR:v[0-9]+]]
+; WAVE64-NEXT: v_writelane_b32 [[TEMP_VGPR]], s30, 0
+; WAVE64-NEXT: v_writelane_b32 [[TEMP_VGPR]], s31, 1
+; WAVE64-NEXT: buffer_store_dword [[TEMP_VGPR]], off, s[0:3], s33 offset:
+; WAVE64-NEXT: .cfi_offset 16,
+; WAVE64-NEXT: buffer_load_dword [[TEMP_VGPR]]
+
+; WAVE32-LABEL: need_to_spill_pc_to_mem:
+; WAVE32:      s_mov_b32 exec_lo, 3
+; WAVE32-NEXT: buffer_store_dword [[TEMP_VGPR:v[0-9]+]]
+; WAVE32-NEXT: v_writelane_b32 [[TEMP_VGPR]], s30, 0
+; WAVE32-NEXT: v_writelane_b32 [[TEMP_VGPR]], s31, 1
+; WAVE32-NEXT: buffer_store_dword [[TEMP_VGPR]], off, s[0:3], s33 offset:
+; WAVE32-NEXT: .cfi_offset 16,
+; WAVE32-NEXT: buffer_load_dword [[TEMP_VGPR]]
+
+define void @need_to_spill_pc_to_mem() #3 {
+  call void @caller_needs_to_spill_pc_to_memory()
+  ret void
+}
 
 attributes #0 = { nounwind }
 attributes #1 = { nounwind "amdgpu-waves-per-eu"="10,10" }
 attributes #2 = { nounwind "frame-pointer"="all" "amdgpu-waves-per-eu"="12,12" }
+attributes #3 = { nounwind norecurse }
+
 
 !llvm.dbg.cu = !{!0}
 !llvm.module.flags = !{!2, !3}