diff --git a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
@@ -268,6 +268,13 @@
 }
 
 unsigned getEUsPerCU(const MCSubtargetInfo *STI) {
+  // "Per CU" really means "per whatever functional block the waves of a
+  // workgroup must share". For gfx10 in CU mode this is the CU, which contains
+  // two SIMDs.
+  if (isGFX10(*STI) && STI->getFeatureBits().test(FeatureCuMode))
+    return 2;
+  // Pre-gfx10 a CU contains four SIMDs. For gfx10 in WGP mode the WGP contains
+  // two CUs, so a total of four SIMDs.
   return 4;
 }
 
diff --git a/llvm/test/CodeGen/AMDGPU/attr-amdgpu-flat-work-group-size-vgpr-limit.ll b/llvm/test/CodeGen/AMDGPU/attr-amdgpu-flat-work-group-size-vgpr-limit.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/attr-amdgpu-flat-work-group-size-vgpr-limit.ll
@@ -0,0 +1,559 @@
+; -enable-misched=false makes the register usage more predictable
+; -regalloc=fast just makes the test run faster
+; RUN: llc -march=amdgcn -mcpu=gfx900 -amdgpu-function-calls=false -enable-misched=false -regalloc=fast < %s | FileCheck %s --check-prefixes=GCN,GFX9
+; RUN: llc -march=amdgcn -mcpu=gfx1010 -amdgpu-function-calls=false -enable-misched=false -regalloc=fast < %s | FileCheck %s --check-prefixes=GCN,GFX10WGP-WAVE32
+; RUN: llc -march=amdgcn -mcpu=gfx1010 -mattr=+wavefrontsize64 -amdgpu-function-calls=false -enable-misched=false -regalloc=fast < %s | FileCheck %s --check-prefixes=GCN,GFX10WGP-WAVE64
+; RUN: llc -march=amdgcn -mcpu=gfx1010 -mattr=+cumode -amdgpu-function-calls=false -enable-misched=false -regalloc=fast < %s | FileCheck %s --check-prefixes=GCN,GFX10CU-WAVE32
+; RUN: llc -march=amdgcn -mcpu=gfx1010 -mattr=+cumode,+wavefrontsize64 -amdgpu-function-calls=false -enable-misched=false -regalloc=fast < %s | FileCheck %s --check-prefixes=GCN,GFX10CU-WAVE64
+
+define internal void @use256vgprs() {
+  %v0 = call i32 asm sideeffect "; def $0", "=v"()
+  %v1 = call i32 asm sideeffect "; def $0", "=v"()
+  %v2 = call i32 asm sideeffect "; def $0", "=v"()
+  %v3 = call i32 asm sideeffect "; def $0", "=v"()
+  %v4 = call i32 asm sideeffect "; def $0", "=v"()
+  %v5 = call i32 asm sideeffect "; def $0", "=v"()
+  %v6 = call i32 asm sideeffect "; def $0", "=v"()
+  %v7 = call i32 asm sideeffect "; def $0", "=v"()
+  %v8 = call i32 asm sideeffect "; def $0", "=v"()
+  %v9 = call i32 asm sideeffect "; def $0", "=v"()
+  %v10 = call i32 asm sideeffect "; def $0", "=v"()
+  %v11 = call i32 asm sideeffect "; def $0", "=v"()
+  %v12 = call i32 asm sideeffect "; def $0", "=v"()
+  %v13 = call i32 asm sideeffect "; def $0", "=v"()
+  %v14 = call i32 asm sideeffect "; def $0", "=v"()
+  %v15 = call i32 asm sideeffect "; def $0", "=v"()
+  %v16 = call i32 asm sideeffect "; def $0", "=v"()
+  %v17 = call i32 asm sideeffect "; def $0", "=v"()
+  %v18 = call i32 asm sideeffect "; def $0", "=v"()
+  %v19 = call i32 asm sideeffect "; def $0", "=v"()
+  %v20 = call i32 asm sideeffect "; def $0", "=v"()
+  %v21 = call i32 asm sideeffect "; def $0", "=v"()
+  %v22 = call i32 asm sideeffect "; def $0", "=v"()
+  %v23 = call i32 asm sideeffect "; def $0", "=v"()
+  %v24 = call i32 asm sideeffect "; def $0", "=v"()
+  %v25 = call i32 asm sideeffect "; def $0", "=v"()
+  %v26 = call i32 asm sideeffect "; def $0", "=v"()
+  %v27 = call i32 asm sideeffect "; def $0", "=v"()
+  %v28 = call i32 asm sideeffect "; def $0", "=v"()
+  %v29 = call i32 asm sideeffect "; def $0", "=v"()
+  %v30 = call i32 asm sideeffect "; def $0", "=v"()
+  %v31 = call i32 asm sideeffect "; def $0", "=v"()
+  %v32 = call i32 asm sideeffect "; def $0", "=v"()
+  %v33 = call i32 asm sideeffect "; def $0", "=v"()
+  %v34 = call i32 asm sideeffect "; def $0", "=v"()
+  %v35 = call i32 asm sideeffect "; def $0", "=v"()
+  %v36 = call i32 asm sideeffect "; def $0", "=v"()
+  %v37 = call i32 asm sideeffect "; def $0", "=v"()
+  %v38 = call i32 asm sideeffect "; def $0", "=v"()
+  %v39 = call i32 asm sideeffect "; def $0", "=v"()
+  %v40 = call i32 asm sideeffect "; def $0", "=v"()
+  %v41 = call i32 asm sideeffect "; def $0", "=v"()
+  %v42 = call i32 asm sideeffect "; def $0", "=v"()
+  %v43 = call i32 asm sideeffect "; def $0", "=v"()
+  %v44 = call i32 asm sideeffect "; def $0", "=v"()
+  %v45 = call i32 asm sideeffect "; def $0", "=v"()
+  %v46 = call i32 asm sideeffect "; def $0", "=v"()
+  %v47 = call i32 asm sideeffect "; def $0", "=v"()
+  %v48 = call i32 asm sideeffect "; def $0", "=v"()
+  %v49 = call i32 asm sideeffect "; def $0", "=v"()
+  %v50 = call i32 asm sideeffect "; def $0", "=v"()
+  %v51 = call i32 asm sideeffect "; def $0", "=v"()
+  %v52 = call i32 asm sideeffect "; def $0", "=v"()
+  %v53 = call i32 asm sideeffect "; def $0", "=v"()
+  %v54 = call i32 asm sideeffect "; def $0", "=v"()
+  %v55 = call i32 asm sideeffect "; def $0", "=v"()
+  %v56 = call i32 asm sideeffect "; def $0", "=v"()
+  %v57 = call i32 asm sideeffect "; def $0", "=v"()
+  %v58 = call i32 asm sideeffect "; def $0", "=v"()
+  %v59 = call i32 asm sideeffect "; def $0", "=v"()
+  %v60 = call i32 asm sideeffect "; def $0", "=v"()
+  %v61 = call i32 asm sideeffect "; def $0", "=v"()
+  %v62 = call i32 asm sideeffect "; def $0", "=v"()
+  %v63 = call i32 asm sideeffect "; def $0", "=v"()
+  %v64 = call i32 asm sideeffect "; def $0", "=v"()
+  %v65 = call i32 asm sideeffect "; def $0", "=v"()
+  %v66 = call i32 asm sideeffect "; def $0", "=v"()
+  %v67 = call i32 asm sideeffect "; def $0", "=v"()
+  %v68 = call i32 asm sideeffect "; def $0", "=v"()
+  %v69 = call i32 asm sideeffect "; def $0", "=v"()
+  %v70 = call i32 asm sideeffect "; def $0", "=v"()
+  %v71 = call i32 asm sideeffect "; def $0", "=v"()
+  %v72 = call i32 asm sideeffect "; def $0", "=v"()
+  %v73 = call i32 asm sideeffect "; def $0", "=v"()
+  %v74 = call i32 asm sideeffect "; def $0", "=v"()
+  %v75 = call i32 asm sideeffect "; def $0", "=v"()
+  %v76 = call i32 asm sideeffect "; def $0", "=v"()
+  %v77 = call i32 asm sideeffect "; def $0", "=v"()
+  %v78 = call i32 asm sideeffect "; def $0", "=v"()
+  %v79 = call i32 asm sideeffect "; def $0", "=v"()
+  %v80 = call i32 asm sideeffect "; def $0", "=v"()
+  %v81 = call i32 asm sideeffect "; def $0", "=v"()
+  %v82 = call i32 asm sideeffect "; def $0", "=v"()
+  %v83 = call i32 asm sideeffect "; def $0", "=v"()
+  %v84 = call i32 asm sideeffect "; def $0", "=v"()
+  %v85 = call i32 asm sideeffect "; def $0", "=v"()
+  %v86 = call i32 asm sideeffect "; def $0", "=v"()
+  %v87 = call i32 asm sideeffect "; def $0", "=v"()
+  %v88 = call i32 asm sideeffect "; def $0", "=v"()
+  %v89 = call i32 asm sideeffect "; def $0", "=v"()
+  %v90 = call i32 asm sideeffect "; def $0", "=v"()
+  %v91 = call i32 asm sideeffect "; def $0", "=v"()
+  %v92 = call i32 asm sideeffect "; def $0", "=v"()
+  %v93 = call i32 asm sideeffect "; def $0", "=v"()
+  %v94 = call i32 asm sideeffect "; def $0", "=v"()
+  %v95 = call i32 asm sideeffect "; def $0", "=v"()
+  %v96 = call i32 asm sideeffect "; def $0", "=v"()
+  %v97 = call i32 asm sideeffect "; def $0", "=v"()
+  %v98 = call i32 asm sideeffect "; def $0", "=v"()
+  %v99 = call i32 asm sideeffect "; def $0", "=v"()
+  %v100 = call i32 asm sideeffect "; def $0", "=v"()
+  %v101 = call i32 asm sideeffect "; def $0", "=v"()
+  %v102 = call i32 asm sideeffect "; def $0", "=v"()
+  %v103 = call i32 asm sideeffect "; def $0", "=v"()
+  %v104 = call i32 asm sideeffect "; def $0", "=v"()
+  %v105 = call i32 asm sideeffect "; def $0", "=v"()
+  %v106 = call i32 asm sideeffect "; def $0", "=v"()
+  %v107 = call i32 asm sideeffect "; def $0", "=v"()
+  %v108 = call i32 asm sideeffect "; def $0", "=v"()
+  %v109 = call i32 asm sideeffect "; def $0", "=v"()
+  %v110 = call i32 asm sideeffect "; def $0", "=v"()
+  %v111 = call i32 asm sideeffect "; def $0", "=v"()
+  %v112 = call i32 asm sideeffect "; def $0", "=v"()
+  %v113 = call i32 asm sideeffect "; def $0", "=v"()
+  %v114 = call i32 asm sideeffect "; def $0", "=v"()
+  %v115 = call i32 asm sideeffect "; def $0", "=v"()
+  %v116 = call i32 asm sideeffect "; def $0", "=v"()
+  %v117 = call i32 asm sideeffect "; def $0", "=v"()
+  %v118 = call i32 asm sideeffect "; def $0", "=v"()
+  %v119 = call i32 asm sideeffect "; def $0", "=v"()
+  %v120 = call i32 asm sideeffect "; def $0", "=v"()
+  %v121 = call i32 asm sideeffect "; def $0", "=v"()
+  %v122 = call i32 asm sideeffect "; def $0", "=v"()
+  %v123 = call i32 asm sideeffect "; def $0", "=v"()
+  %v124 = call i32 asm sideeffect "; def $0", "=v"()
+  %v125 = call i32 asm sideeffect "; def $0", "=v"()
+  %v126 = call i32 asm sideeffect "; def $0", "=v"()
+  %v127 = call i32 asm sideeffect "; def $0", "=v"()
+  %v128 = call i32 asm sideeffect "; def $0", "=v"()
+  %v129 = call i32 asm sideeffect "; def $0", "=v"()
+  %v130 = call i32 asm sideeffect "; def $0", "=v"()
+  %v131 = call i32 asm sideeffect "; def $0", "=v"()
+  %v132 = call i32 asm sideeffect "; def $0", "=v"()
+  %v133 = call i32 asm sideeffect "; def $0", "=v"()
+  %v134 = call i32 asm sideeffect "; def $0", "=v"()
+  %v135 = call i32 asm sideeffect "; def $0", "=v"()
+  %v136 = call i32 asm sideeffect "; def $0", "=v"()
+  %v137 = call i32 asm sideeffect "; def $0", "=v"()
+  %v138 = call i32 asm sideeffect "; def $0", "=v"()
+  %v139 = call i32 asm sideeffect "; def $0", "=v"()
+  %v140 = call i32 asm sideeffect "; def $0", "=v"()
+  %v141 = call i32 asm sideeffect "; def $0", "=v"()
+  %v142 = call i32 asm sideeffect "; def $0", "=v"()
+  %v143 = call i32 asm sideeffect "; def $0", "=v"()
+  %v144 = call i32 asm sideeffect "; def $0", "=v"()
+  %v145 = call i32 asm sideeffect "; def $0", "=v"()
+  %v146 = call i32 asm sideeffect "; def $0", "=v"()
+  %v147 = call i32 asm sideeffect "; def $0", "=v"()
+  %v148 = call i32 asm sideeffect "; def $0", "=v"()
+  %v149 = call i32 asm sideeffect "; def $0", "=v"()
+  %v150 = call i32 asm sideeffect "; def $0", "=v"()
+  %v151 = call i32 asm sideeffect "; def $0", "=v"()
+  %v152 = call i32 asm sideeffect "; def $0", "=v"()
+  %v153 = call i32 asm sideeffect "; def $0", "=v"()
+  %v154 = call i32 asm sideeffect "; def $0", "=v"()
+  %v155 = call i32 asm sideeffect "; def $0", "=v"()
+  %v156 = call i32 asm sideeffect "; def $0", "=v"()
+  %v157 = call i32 asm sideeffect "; def $0", "=v"()
+  %v158 = call i32 asm sideeffect "; def $0", "=v"()
+  %v159 = call i32 asm sideeffect "; def $0", "=v"()
+  %v160 = call i32 asm sideeffect "; def $0", "=v"()
+  %v161 = call i32 asm sideeffect "; def $0", "=v"()
+  %v162 = call i32 asm sideeffect "; def $0", "=v"()
+  %v163 = call i32 asm sideeffect "; def $0", "=v"()
+  %v164 = call i32 asm sideeffect "; def $0", "=v"()
+  %v165 = call i32 asm sideeffect "; def $0", "=v"()
+  %v166 = call i32 asm sideeffect "; def $0", "=v"()
+  %v167 = call i32 asm sideeffect "; def $0", "=v"()
+  %v168 = call i32 asm sideeffect "; def $0", "=v"()
+  %v169 = call i32 asm sideeffect "; def $0", "=v"()
+  %v170 = call i32 asm sideeffect "; def $0", "=v"()
+  %v171 = call i32 asm sideeffect "; def $0", "=v"()
+  %v172 = call i32 asm sideeffect "; def $0", "=v"()
+  %v173 = call i32 asm sideeffect "; def $0", "=v"()
+  %v174 = call i32 asm sideeffect "; def $0", "=v"()
+  %v175 = call i32 asm sideeffect "; def $0", "=v"()
+  %v176 = call i32 asm sideeffect "; def $0", "=v"()
+  %v177 = call i32 asm sideeffect "; def $0", "=v"()
+  %v178 = call i32 asm sideeffect "; def $0", "=v"()
+  %v179 = call i32 asm sideeffect "; def $0", "=v"()
+  %v180 = call i32 asm sideeffect "; def $0", "=v"()
+  %v181 = call i32 asm sideeffect "; def $0", "=v"()
+  %v182 = call i32 asm sideeffect "; def $0", "=v"()
+  %v183 = call i32 asm sideeffect "; def $0", "=v"()
+  %v184 = call i32 asm sideeffect "; def $0", "=v"()
+  %v185 = call i32 asm sideeffect "; def $0", "=v"()
+  %v186 = call i32 asm sideeffect "; def $0", "=v"()
+  %v187 = call i32 asm sideeffect "; def $0", "=v"()
+  %v188 = call i32 asm sideeffect "; def $0", "=v"()
+  %v189 = call i32 asm sideeffect "; def $0", "=v"()
+  %v190 = call i32 asm sideeffect "; def $0", "=v"()
+  %v191 = call i32 asm sideeffect "; def $0", "=v"()
+  %v192 = call i32 asm sideeffect "; def $0", "=v"()
+  %v193 = call i32 asm sideeffect "; def $0", "=v"()
+  %v194 = call i32 asm sideeffect "; def $0", "=v"()
+  %v195 = call i32 asm sideeffect "; def $0", "=v"()
+  %v196 = call i32 asm sideeffect "; def $0", "=v"()
+  %v197 = call i32 asm sideeffect "; def $0", "=v"()
+  %v198 = call i32 asm sideeffect "; def $0", "=v"()
+  %v199 = call i32 asm sideeffect "; def $0", "=v"()
+  %v200 = call i32 asm sideeffect "; def $0", "=v"()
+  %v201 = call i32 asm sideeffect "; def $0", "=v"()
+  %v202 = call i32 asm sideeffect "; def $0", "=v"()
+  %v203 = call i32 asm sideeffect "; def $0", "=v"()
+  %v204 = call i32 asm sideeffect "; def $0", "=v"()
+  %v205 = call i32 asm sideeffect "; def $0", "=v"()
+  %v206 = call i32 asm sideeffect "; def $0", "=v"()
+  %v207 = call i32 asm sideeffect "; def $0", "=v"()
+  %v208 = call i32 asm sideeffect "; def $0", "=v"()
+  %v209 = call i32 asm sideeffect "; def $0", "=v"()
+  %v210 = call i32 asm sideeffect "; def $0", "=v"()
+  %v211 = call i32 asm sideeffect "; def $0", "=v"()
+  %v212 = call i32 asm sideeffect "; def $0", "=v"()
+  %v213 = call i32 asm sideeffect "; def $0", "=v"()
+  %v214 = call i32 asm sideeffect "; def $0", "=v"()
+  %v215 = call i32 asm sideeffect "; def $0", "=v"()
+  %v216 = call i32 asm sideeffect "; def $0", "=v"()
+  %v217 = call i32 asm sideeffect "; def $0", "=v"()
+  %v218 = call i32 asm sideeffect "; def $0", "=v"()
+  %v219 = call i32 asm sideeffect "; def $0", "=v"()
+  %v220 = call i32 asm sideeffect "; def $0", "=v"()
+  %v221 = call i32 asm sideeffect "; def $0", "=v"()
+  %v222 = call i32 asm sideeffect "; def $0", "=v"()
+  %v223 = call i32 asm sideeffect "; def $0", "=v"()
+  %v224 = call i32 asm sideeffect "; def $0", "=v"()
+  %v225 = call i32 asm sideeffect "; def $0", "=v"()
+  %v226 = call i32 asm sideeffect "; def $0", "=v"()
+  %v227 = call i32 asm sideeffect "; def $0", "=v"()
+  %v228 = call i32 asm sideeffect "; def $0", "=v"()
+  %v229 = call i32 asm sideeffect "; def $0", "=v"()
+  %v230 = call i32 asm sideeffect "; def $0", "=v"()
+  %v231 = call i32 asm sideeffect "; def $0", "=v"()
+  %v232 = call i32 asm sideeffect "; def $0", "=v"()
+  %v233 = call i32 asm sideeffect "; def $0", "=v"()
+  %v234 = call i32 asm sideeffect "; def $0", "=v"()
+  %v235 = call i32 asm sideeffect "; def $0", "=v"()
+  %v236 = call i32 asm sideeffect "; def $0", "=v"()
+  %v237 = call i32 asm sideeffect "; def $0", "=v"()
+  %v238 = call i32 asm sideeffect "; def $0", "=v"()
+  %v239 = call i32 asm sideeffect "; def $0", "=v"()
+  %v240 = call i32 asm sideeffect "; def $0", "=v"()
+  %v241 = call i32 asm sideeffect "; def $0", "=v"()
+  %v242 = call i32 asm sideeffect "; def $0", "=v"()
+  %v243 = call i32 asm sideeffect "; def $0", "=v"()
+  %v244 = call i32 asm sideeffect "; def $0", "=v"()
+  %v245 = call i32 asm sideeffect "; def $0", "=v"()
+  %v246 = call i32 asm sideeffect "; def $0", "=v"()
+  %v247 = call i32 asm sideeffect "; def $0", "=v"()
+  %v248 = call i32 asm sideeffect "; def $0", "=v"()
+  %v249 = call i32 asm sideeffect "; def $0", "=v"()
+  %v250 = call i32 asm sideeffect "; def $0", "=v"()
+  %v251 = call i32 asm sideeffect "; def $0", "=v"()
+  %v252 = call i32 asm sideeffect "; def $0", "=v"()
+  %v253 = call i32 asm sideeffect "; def $0", "=v"()
+  %v254 = call i32 asm sideeffect "; def $0", "=v"()
+  %v255 = call i32 asm sideeffect "; def $0", "=v"()
+  call void asm sideeffect "; use $0", "v"(i32 %v0)
+  call void asm sideeffect "; use $0", "v"(i32 %v1)
+  call void asm sideeffect "; use $0", "v"(i32 %v2)
+  call void asm sideeffect "; use $0", "v"(i32 %v3)
+  call void asm sideeffect "; use $0", "v"(i32 %v4)
+  call void asm sideeffect "; use $0", "v"(i32 %v5)
+  call void asm sideeffect "; use $0", "v"(i32 %v6)
+  call void asm sideeffect "; use $0", "v"(i32 %v7)
+  call void asm sideeffect "; use $0", "v"(i32 %v8)
+  call void asm sideeffect "; use $0", "v"(i32 %v9)
+  call void asm sideeffect "; use $0", "v"(i32 %v10)
+  call void asm sideeffect "; use $0", "v"(i32 %v11)
+  call void asm sideeffect "; use $0", "v"(i32 %v12)
+  call void asm sideeffect "; use $0", "v"(i32 %v13)
+  call void asm sideeffect "; use $0", "v"(i32 %v14)
+  call void asm sideeffect "; use $0", "v"(i32 %v15)
+  call void asm sideeffect "; use $0", "v"(i32 %v16)
+  call void asm sideeffect "; use $0", "v"(i32 %v17)
+  call void asm sideeffect "; use $0", "v"(i32 %v18)
+  call void asm sideeffect "; use $0", "v"(i32 %v19)
+  call void asm sideeffect "; use $0", "v"(i32 %v20)
+  call void asm sideeffect "; use $0", "v"(i32 %v21)
+  call void asm sideeffect "; use $0", "v"(i32 %v22)
+  call void asm sideeffect "; use $0", "v"(i32 %v23)
+  call void asm sideeffect "; use $0", "v"(i32 %v24)
+  call void asm sideeffect "; use $0", "v"(i32 %v25)
+  call void asm sideeffect "; use $0", "v"(i32 %v26)
+  call void asm sideeffect "; use $0", "v"(i32 %v27)
+  call void asm sideeffect "; use $0", "v"(i32 %v28)
+  call void asm sideeffect "; use $0", "v"(i32 %v29)
+  call void asm sideeffect "; use $0", "v"(i32 %v30)
+  call void asm sideeffect "; use $0", "v"(i32 %v31)
+  call void asm sideeffect "; use $0", "v"(i32 %v32)
+  call void asm sideeffect "; use $0", "v"(i32 %v33)
+  call void asm sideeffect "; use $0", "v"(i32 %v34)
+  call void asm sideeffect "; use $0", "v"(i32 %v35)
+  call void asm sideeffect "; use $0", "v"(i32 %v36)
+  call void asm sideeffect "; use $0", "v"(i32 %v37)
+  call void asm sideeffect "; use $0", "v"(i32 %v38)
+  call void asm sideeffect "; use $0", "v"(i32 %v39)
+  call void asm sideeffect "; use $0", "v"(i32 %v40)
+  call void asm sideeffect "; use $0", "v"(i32 %v41)
+  call void asm sideeffect "; use $0", "v"(i32 %v42)
+  call void asm sideeffect "; use $0", "v"(i32 %v43)
+  call void asm sideeffect "; use $0", "v"(i32 %v44)
+  call void asm sideeffect "; use $0", "v"(i32 %v45)
+  call void asm sideeffect "; use $0", "v"(i32 %v46)
+  call void asm sideeffect "; use $0", "v"(i32 %v47)
+  call void asm sideeffect "; use $0", "v"(i32 %v48)
+  call void asm sideeffect "; use $0", "v"(i32 %v49)
+  call void asm sideeffect "; use $0", "v"(i32 %v50)
+  call void asm sideeffect "; use $0", "v"(i32 %v51)
+  call void asm sideeffect "; use $0", "v"(i32 %v52)
+  call void asm sideeffect "; use $0", "v"(i32 %v53)
+  call void asm sideeffect "; use $0", "v"(i32 %v54)
+  call void asm sideeffect "; use $0", "v"(i32 %v55)
+  call void asm sideeffect "; use $0", "v"(i32 %v56)
+  call void asm sideeffect "; use $0", "v"(i32 %v57)
+  call void asm sideeffect "; use $0", "v"(i32 %v58)
+  call void asm sideeffect "; use $0", "v"(i32 %v59)
+  call void asm sideeffect "; use $0", "v"(i32 %v60)
+  call void asm sideeffect "; use $0", "v"(i32 %v61)
+  call void asm sideeffect "; use $0", "v"(i32 %v62)
+  call void asm sideeffect "; use $0", "v"(i32 %v63)
+  call void asm sideeffect "; use $0", "v"(i32 %v64)
+  call void asm sideeffect "; use $0", "v"(i32 %v65)
+  call void asm sideeffect "; use $0", "v"(i32 %v66)
+  call void asm sideeffect "; use $0", "v"(i32 %v67)
+  call void asm sideeffect "; use $0", "v"(i32 %v68)
+  call void asm sideeffect "; use $0", "v"(i32 %v69)
+  call void asm sideeffect "; use $0", "v"(i32 %v70)
+  call void asm sideeffect "; use $0", "v"(i32 %v71)
+  call void asm sideeffect "; use $0", "v"(i32 %v72)
+  call void asm sideeffect "; use $0", "v"(i32 %v73)
+  call void asm sideeffect "; use $0", "v"(i32 %v74)
+  call void asm sideeffect "; use $0", "v"(i32 %v75)
+  call void asm sideeffect "; use $0", "v"(i32 %v76)
+  call void asm sideeffect "; use $0", "v"(i32 %v77)
+  call void asm sideeffect "; use $0", "v"(i32 %v78)
+  call void asm sideeffect "; use $0", "v"(i32 %v79)
+  call void asm sideeffect "; use $0", "v"(i32 %v80)
+  call void asm sideeffect "; use $0", "v"(i32 %v81)
+  call void asm sideeffect "; use $0", "v"(i32 %v82)
+  call void asm sideeffect "; use $0", "v"(i32 %v83)
+  call void asm sideeffect "; use $0", "v"(i32 %v84)
+  call void asm sideeffect "; use $0", "v"(i32 %v85)
+  call void asm sideeffect "; use $0", "v"(i32 %v86)
+  call void asm sideeffect "; use $0", "v"(i32 %v87)
+  call void asm sideeffect "; use $0", "v"(i32 %v88)
+  call void asm sideeffect "; use $0", "v"(i32 %v89)
+  call void asm sideeffect "; use $0", "v"(i32 %v90)
+  call void asm sideeffect "; use $0", "v"(i32 %v91)
+  call void asm sideeffect "; use $0", "v"(i32 %v92)
+  call void asm sideeffect "; use $0", "v"(i32 %v93)
+  call void asm sideeffect "; use $0", "v"(i32 %v94)
+  call void asm sideeffect "; use $0", "v"(i32 %v95)
+  call void asm sideeffect "; use $0", "v"(i32 %v96)
+  call void asm sideeffect "; use $0", "v"(i32 %v97)
+  call void asm sideeffect "; use $0", "v"(i32 %v98)
+  call void asm sideeffect "; use $0", "v"(i32 %v99)
+  call void asm sideeffect "; use $0", "v"(i32 %v100)
+  call void asm sideeffect "; use $0", "v"(i32 %v101)
+  call void asm sideeffect "; use $0", "v"(i32 %v102)
+  call void asm sideeffect "; use $0", "v"(i32 %v103)
+  call void asm sideeffect "; use $0", "v"(i32 %v104)
+  call void asm sideeffect "; use $0", "v"(i32 %v105)
+  call void asm sideeffect "; use $0", "v"(i32 %v106)
+  call void asm sideeffect "; use $0", "v"(i32 %v107)
+  call void asm sideeffect "; use $0", "v"(i32 %v108)
+  call void asm sideeffect "; use $0", "v"(i32 %v109)
+  call void asm sideeffect "; use $0", "v"(i32 %v110)
+  call void asm sideeffect "; use $0", "v"(i32 %v111)
+  call void asm sideeffect "; use $0", "v"(i32 %v112)
+  call void asm sideeffect "; use $0", "v"(i32 %v113)
+  call void asm sideeffect "; use $0", "v"(i32 %v114)
+  call void asm sideeffect "; use $0", "v"(i32 %v115)
+  call void asm sideeffect "; use $0", "v"(i32 %v116)
+  call void asm sideeffect "; use $0", "v"(i32 %v117)
+  call void asm sideeffect "; use $0", "v"(i32 %v118)
+  call void asm sideeffect "; use $0", "v"(i32 %v119)
+  call void asm sideeffect "; use $0", "v"(i32 %v120)
+  call void asm sideeffect "; use $0", "v"(i32 %v121)
+  call void asm sideeffect "; use $0", "v"(i32 %v122)
+  call void asm sideeffect "; use $0", "v"(i32 %v123)
+  call void asm sideeffect "; use $0", "v"(i32 %v124)
+  call void asm sideeffect "; use $0", "v"(i32 %v125)
+  call void asm sideeffect "; use $0", "v"(i32 %v126)
+  call void asm sideeffect "; use $0", "v"(i32 %v127)
+  call void asm sideeffect "; use $0", "v"(i32 %v128)
+  call void asm sideeffect "; use $0", "v"(i32 %v129)
+  call void asm sideeffect "; use $0", "v"(i32 %v130)
+  call void asm sideeffect "; use $0", "v"(i32 %v131)
+  call void asm sideeffect "; use $0", "v"(i32 %v132)
+  call void asm sideeffect "; use $0", "v"(i32 %v133)
+  call void asm sideeffect "; use $0", "v"(i32 %v134)
+  call void asm sideeffect "; use $0", "v"(i32 %v135)
+  call void asm sideeffect "; use $0", "v"(i32 %v136)
+  call void asm sideeffect "; use $0", "v"(i32 %v137)
+  call void asm sideeffect "; use $0", "v"(i32 %v138)
+  call void asm sideeffect "; use $0", "v"(i32 %v139)
+  call void asm sideeffect "; use $0", "v"(i32 %v140)
+  call void asm sideeffect "; use $0", "v"(i32 %v141)
+  call void asm sideeffect "; use $0", "v"(i32 %v142)
+  call void asm sideeffect "; use $0", "v"(i32 %v143)
+  call void asm sideeffect "; use $0", "v"(i32 %v144)
+  call void asm sideeffect "; use $0", "v"(i32 %v145)
+  call void asm sideeffect "; use $0", "v"(i32 %v146)
+  call void asm sideeffect "; use $0", "v"(i32 %v147)
+  call void asm sideeffect "; use $0", "v"(i32 %v148)
+  call void asm sideeffect "; use $0", "v"(i32 %v149)
+  call void asm sideeffect "; use $0", "v"(i32 %v150)
+  call void asm sideeffect "; use $0", "v"(i32 %v151)
+  call void asm sideeffect "; use $0", "v"(i32 %v152)
+  call void asm sideeffect "; use $0", "v"(i32 %v153)
+  call void asm sideeffect "; use $0", "v"(i32 %v154)
+  call void asm sideeffect "; use $0", "v"(i32 %v155)
+  call void asm sideeffect "; use $0", "v"(i32 %v156)
+  call void asm sideeffect "; use $0", "v"(i32 %v157)
+  call void asm sideeffect "; use $0", "v"(i32 %v158)
+  call void asm sideeffect "; use $0", "v"(i32 %v159)
+  call void asm sideeffect "; use $0", "v"(i32 %v160)
+  call void asm sideeffect "; use $0", "v"(i32 %v161)
+  call void asm sideeffect "; use $0", "v"(i32 %v162)
+  call void asm sideeffect "; use $0", "v"(i32 %v163)
+  call void asm sideeffect "; use $0", "v"(i32 %v164)
+  call void asm sideeffect "; use $0", "v"(i32 %v165)
+  call void asm sideeffect "; use $0", "v"(i32 %v166)
+  call void asm sideeffect "; use $0", "v"(i32 %v167)
+  call void asm sideeffect "; use $0", "v"(i32 %v168)
+  call void asm sideeffect "; use $0", "v"(i32 %v169)
+  call void asm sideeffect "; use $0", "v"(i32 %v170)
+  call void asm sideeffect "; use $0", "v"(i32 %v171)
+  call void asm sideeffect "; use $0", "v"(i32 %v172)
+  call void asm sideeffect "; use $0", "v"(i32 %v173)
+  call void asm sideeffect "; use $0", "v"(i32 %v174)
+  call void asm sideeffect "; use $0", "v"(i32 %v175)
+  call void asm sideeffect "; use $0", "v"(i32 %v176)
+  call void asm sideeffect "; use $0", "v"(i32 %v177)
+  call void asm sideeffect "; use $0", "v"(i32 %v178)
+  call void asm sideeffect "; use $0", "v"(i32 %v179)
+  call void asm sideeffect "; use $0", "v"(i32 %v180)
+  call void asm sideeffect "; use $0", "v"(i32 %v181)
+  call void asm sideeffect "; use $0", "v"(i32 %v182)
+  call void asm sideeffect "; use $0", "v"(i32 %v183)
+  call void asm sideeffect "; use $0", "v"(i32 %v184)
+  call void asm sideeffect "; use $0", "v"(i32 %v185)
+  call void asm sideeffect "; use $0", "v"(i32 %v186)
+  call void asm sideeffect "; use $0", "v"(i32 %v187)
+  call void asm sideeffect "; use $0", "v"(i32 %v188)
+  call void asm sideeffect "; use $0", "v"(i32 %v189)
+  call void asm sideeffect "; use $0", "v"(i32 %v190)
+  call void asm sideeffect "; use $0", "v"(i32 %v191)
+  call void asm sideeffect "; use $0", "v"(i32 %v192)
+  call void asm sideeffect "; use $0", "v"(i32 %v193)
+  call void asm sideeffect "; use $0", "v"(i32 %v194)
+  call void asm sideeffect "; use $0", "v"(i32 %v195)
+  call void asm sideeffect "; use $0", "v"(i32 %v196)
+  call void asm sideeffect "; use $0", "v"(i32 %v197)
+  call void asm sideeffect "; use $0", "v"(i32 %v198)
+  call void asm sideeffect "; use $0", "v"(i32 %v199)
+  call void asm sideeffect "; use $0", "v"(i32 %v200)
+  call void asm sideeffect "; use $0", "v"(i32 %v201)
+  call void asm sideeffect "; use $0", "v"(i32 %v202)
+  call void asm sideeffect "; use $0", "v"(i32 %v203)
+  call void asm sideeffect "; use $0", "v"(i32 %v204)
+  call void asm sideeffect "; use $0", "v"(i32 %v205)
+  call void asm sideeffect "; use $0", "v"(i32 %v206)
+  call void asm sideeffect "; use $0", "v"(i32 %v207)
+  call void asm sideeffect "; use $0", "v"(i32 %v208)
+  call void asm sideeffect "; use $0", "v"(i32 %v209)
+  call void asm sideeffect "; use $0", "v"(i32 %v210)
+  call void asm sideeffect "; use $0", "v"(i32 %v211)
+  call void asm sideeffect "; use $0", "v"(i32 %v212)
+  call void asm sideeffect "; use $0", "v"(i32 %v213)
+  call void asm sideeffect "; use $0", "v"(i32 %v214)
+  call void asm sideeffect "; use $0", "v"(i32 %v215)
+  call void asm sideeffect "; use $0", "v"(i32 %v216)
+  call void asm sideeffect "; use $0", "v"(i32 %v217)
+  call void asm sideeffect "; use $0", "v"(i32 %v218)
+  call void asm sideeffect "; use $0", "v"(i32 %v219)
+  call void asm sideeffect "; use $0", "v"(i32 %v220)
+  call void asm sideeffect "; use $0", "v"(i32 %v221)
+  call void asm sideeffect "; use $0", "v"(i32 %v222)
+  call void asm sideeffect "; use $0", "v"(i32 %v223)
+  call void asm sideeffect "; use $0", "v"(i32 %v224)
+  call void asm sideeffect "; use $0", "v"(i32 %v225)
+  call void asm sideeffect "; use $0", "v"(i32 %v226)
+  call void asm sideeffect "; use $0", "v"(i32 %v227)
+  call void asm sideeffect "; use $0", "v"(i32 %v228)
+  call void asm sideeffect "; use $0", "v"(i32 %v229)
+  call void asm sideeffect "; use $0", "v"(i32 %v230)
+  call void asm sideeffect "; use $0", "v"(i32 %v231)
+  call void asm sideeffect "; use $0", "v"(i32 %v232)
+  call void asm sideeffect "; use $0", "v"(i32 %v233)
+  call void asm sideeffect "; use $0", "v"(i32 %v234)
+  call void asm sideeffect "; use $0", "v"(i32 %v235)
+  call void asm sideeffect "; use $0", "v"(i32 %v236)
+  call void asm sideeffect "; use $0", "v"(i32 %v237)
+  call void asm sideeffect "; use $0", "v"(i32 %v238)
+  call void asm sideeffect "; use $0", "v"(i32 %v239)
+  call void asm sideeffect "; use $0", "v"(i32 %v240)
+  call void asm sideeffect "; use $0", "v"(i32 %v241)
+  call void asm sideeffect "; use $0", "v"(i32 %v242)
+  call void asm sideeffect "; use $0", "v"(i32 %v243)
+  call void asm sideeffect "; use $0", "v"(i32 %v244)
+  call void asm sideeffect "; use $0", "v"(i32 %v245)
+  call void asm sideeffect "; use $0", "v"(i32 %v246)
+  call void asm sideeffect "; use $0", "v"(i32 %v247)
+  call void asm sideeffect "; use $0", "v"(i32 %v248)
+  call void asm sideeffect "; use $0", "v"(i32 %v249)
+  call void asm sideeffect "; use $0", "v"(i32 %v250)
+  call void asm sideeffect "; use $0", "v"(i32 %v251)
+  call void asm sideeffect "; use $0", "v"(i32 %v252)
+  call void asm sideeffect "; use $0", "v"(i32 %v253)
+  call void asm sideeffect "; use $0", "v"(i32 %v254)
+  call void asm sideeffect "; use $0", "v"(i32 %v255)
+  ret void
+}
+
+; GCN-LABEL: {{^}}f256:
+; GFX9: NumVgprs: 256
+; GFX10WGP-WAVE32: NumVgprs: 256
+; GFX10WGP-WAVE64: NumVgprs: 256
+; GFX10CU-WAVE32: NumVgprs: 256
+; GFX10CU-WAVE64: NumVgprs: 256
+define amdgpu_kernel void @f256() #256 {
+  call void @use256vgprs()
+  ret void
+}
+attributes #256 = { nounwind "amdgpu-flat-work-group-size"="256,256" }
+
+; GCN-LABEL: {{^}}f512:
+; GFX9: NumVgprs: 128
+; GFX10WGP-WAVE32: NumVgprs: 256
+; GFX10WGP-WAVE64: NumVgprs: 256
+; GFX10CU-WAVE32: NumVgprs: 128
+; GFX10CU-WAVE64: NumVgprs: 128
+define amdgpu_kernel void @f512() #512 {
+  call void @use256vgprs()
+  ret void
+}
+attributes #512 = { nounwind "amdgpu-flat-work-group-size"="512,512" }
+
+; GCN-LABEL: {{^}}f1024:
+; GFX9: NumVgprs: 64
+; GFX10WGP-WAVE32: NumVgprs: 128
+; GFX10WGP-WAVE64: NumVgprs: 128
+; GFX10CU-WAVE32: NumVgprs: 64
+; GFX10CU-WAVE64: NumVgprs: 64
+define amdgpu_kernel void @f1024() #1024 {
+  call void @use256vgprs()
+  ret void
+}
+attributes #1024 = { nounwind "amdgpu-flat-work-group-size"="1024,1024" }