Revert "[AMDGPU] Ensure there are enough registers for wave dispatch"

This reverts 329808. That change caused a report of a failure in
test/CodeGen/MIR/AMDGPU/mir-canon-multi.mir that I didn't see. I suspect
it is an expensive-check-only error.

Change-Id: I8133f26f15e7d5ec2b09c687c12cd70e918461b0
llvm-svn: 329811

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp b/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
index 9cb9045..d64e655 100644 (file)
--- a/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
@@ -837,19 +837,6 @@ void AMDGPUAsmPrinter::getSIProgramInfo(SIProgramInfo &ProgInfo,
   ProgInfo.NumSGPR += ExtraSGPRs;
   ProgInfo.NumVGPR += ExtraVGPRs;
 
-  // Ensure there are enough SGPRs and VGPRs for wave dispatch, where wave
-  // dispatch registers are function args.
-  unsigned WaveDispatchNumSGPR = 0, WaveDispatchNumVGPR = 0;
-  for (auto &Arg : MF.getFunction().args()) {
-    unsigned NumRegs = (Arg.getType()->getPrimitiveSizeInBits() + 31) / 32;
-    if (Arg.hasAttribute(Attribute::InReg))
-      WaveDispatchNumSGPR += NumRegs;
-    else
-      WaveDispatchNumVGPR += NumRegs;
-  }
-  ProgInfo.NumSGPR = std::max(ProgInfo.NumSGPR, WaveDispatchNumSGPR);
-  ProgInfo.NumVGPR = std::max(ProgInfo.NumVGPR, WaveDispatchNumVGPR);
-
   // Adjust number of registers used to meet default/requested minimum/maximum
   // number of waves per execution unit request.
   ProgInfo.NumSGPRsForWavesPerEU = std::max(

diff --git a/llvm/test/CodeGen/AMDGPU/wave_dispatch_regs.ll b/llvm/test/CodeGen/AMDGPU/wave_dispatch_regs.ll
deleted file mode 100644 (file)
index 06174f8..0000000
--- a/llvm/test/CodeGen/AMDGPU/wave_dispatch_regs.ll
+++ /dev/null
@@ -1,18 +0,0 @@
-; RUN: llc -mtriple=amdgcn--amdpal -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=SI -enable-var-scope %s
-; RUN: llc -mtriple=amdgcn--amdpal -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=VI -enable-var-scope %s
-; RUN: llc -mtriple=amdgcn--amdpal -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=GFX9 -enable-var-scope %s
-
-; This compute shader has input args that claim that it has 17 sgprs and 5 vgprs
-; in wave dispatch. Ensure that the sgpr and vgpr counts in COMPUTE_PGM_RSRC1
-; are set to reflect that, even though the registers are not used in the shader.
-
-; GCN-LABEL: {{^}}_amdgpu_cs_main:
-; SI: .amd_amdgpu_pal_metadata{{.*}}0x2e12,0x{{[0-9a-f]*}}81,
-; VI: .amd_amdgpu_pal_metadata{{.*}}0x2e12,0x{{[0-9a-f]*}}c1,
-; GFX9: .amd_amdgpu_pal_metadata{{.*}}0x2e12,0x{{[0-9a-f]*}}81,
-
-define dllexport amdgpu_cs void @_amdgpu_cs_main(i32 inreg, i32 inreg, <2 x i32> inreg, i32 inreg, i32 inreg, i32 inreg, i32 inreg, i32 inreg, i32 inreg, i32 inreg, i32 inreg, i32 inreg, <3 x i32> inreg, i32 inreg, <5 x i32>) {
-.entry:
-  ret void
-}
-