diff mbox series

[committed] amdgcn: Don't double-count AVGPRs

Message ID 49e7bf47-f67b-4db0-b2d6-b3a121a363a1@codesourcery.com
State Repeat Merge
Headers
Series [committed] amdgcn: Don't double-count AVGPRs |

Checks

Context Check Description
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Commit Message

Andrew Stubbs Jan. 8, 2024, 10:01 a.m. UTC 
  This patch fixes a runtime error with offload kernels that use a lot of 
registers, such as libgomp.fortran/target1.f90.

Committed to mainline.

Andrew
amdgcn: Don't double-count AVGPRs

CDNA2 devices have VGPRs and AVGPRs combined into a single hardware register
file (they're seperate in CDNA1).  I originally thought they were counted
separately in the vgpr_count and agpr_count metadata fields, and therefore
mkoffload had to account for this when passing the values to libgomp.  However,
that wasn't the case, and this code should have been removed when I corrected
the calculations in gcn.cc.  Fixing the error now.

gcc/ChangeLog:

	* config/gcn/mkoffload.cc (isa_has_combined_avgprs): Delete.
	(process_asm): Don't count avgprs.
diff mbox series

Patch

diff --git a/gcc/config/gcn/mkoffload.cc b/gcc/config/gcn/mkoffload.cc
index 3341c0d34eb..03cd040dbd2 100644
--- a/gcc/config/gcn/mkoffload.cc
+++ b/gcc/config/gcn/mkoffload.cc
@@ -471,26 +471,6 @@  copy_early_debug_info (const char *infile, const char *outfile)
   return true;
 }
 
-/* CDNA2 devices have twice as many VGPRs compared to older devices,
-   but the AVGPRS are allocated from the same pool.  */
-
-static int
-isa_has_combined_avgprs (int isa)
-{
-  switch (isa)
-    {
-    case EF_AMDGPU_MACH_AMDGCN_GFX803:
-    case EF_AMDGPU_MACH_AMDGCN_GFX900:
-    case EF_AMDGPU_MACH_AMDGCN_GFX906:
-    case EF_AMDGPU_MACH_AMDGCN_GFX908:
-    case EF_AMDGPU_MACH_AMDGCN_GFX1030:
-      return false;
-    case EF_AMDGPU_MACH_AMDGCN_GFX90a:
-      return true;
-    }
-  fatal_error (input_location, "unhandled ISA in isa_has_combined_avgprs");
-}
-
 /* Parse an input assembler file, extract the offload tables etc.,
    and output (1) the assembler code, minus the tables (which can contain
    problematic relocations), and (2) a C file with the offload tables
@@ -516,7 +496,6 @@  process_asm (FILE *in, FILE *out, FILE *cfile)
   {
     int sgpr_count;
     int vgpr_count;
-    int avgpr_count;
     char *kernel_name;
   } regcount = { -1, -1, NULL };
 
@@ -564,12 +543,6 @@  process_asm (FILE *in, FILE *out, FILE *cfile)
 		gcc_assert (regcount.kernel_name);
 		break;
 	      }
-	    else if (sscanf (buf, " .agpr_count: %d\n",
-			     &regcount.avgpr_count) == 1)
-	      {
-		gcc_assert (regcount.kernel_name);
-		break;
-	      }
 
 	    break;
 	  }
@@ -712,8 +685,6 @@  process_asm (FILE *in, FILE *out, FILE *cfile)
 	  {
 	    sgpr_count = regcounts[j].sgpr_count;
 	    vgpr_count = regcounts[j].vgpr_count;
-	    if (isa_has_combined_avgprs (elf_arch))
-	      vgpr_count += regcounts[j].avgpr_count;
 	    break;
 	  }