[PATCH] D136106: [clang][RISCV] Set vscale_range attribute based on VLEN

[Philip Reames via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG9a8f3b113d05: [clang][RISCV] Set vscale_range attribute based on VLEN (authored by reames).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D136106/new/

https://reviews.llvm.org/D136106

Files:
  clang/lib/Basic/Targets/RISCV.cpp
  clang/test/CodeGen/riscv-vector-bits-vscale-range.c
  llvm/include/llvm/Support/RISCVISAInfo.h


Index: llvm/include/llvm/Support/RISCVISAInfo.h
===================================================================
--- llvm/include/llvm/Support/RISCVISAInfo.h
+++ llvm/include/llvm/Support/RISCVISAInfo.h
@@ -60,6 +60,7 @@
   unsigned getXLen() const { return XLen; };
   unsigned getFLen() const { return FLen; };
   unsigned getMinVLen() const { return MinVLen; }
+  unsigned getMaxVLen() const { return 65536; }
   unsigned getMaxELen() const { return MaxELen; }
   unsigned getMaxELenFp() const { return MaxELenFp; }
 
Index: clang/test/CodeGen/riscv-vector-bits-vscale-range.c
===================================================================
--- clang/test/CodeGen/riscv-vector-bits-vscale-range.c
+++ clang/test/CodeGen/riscv-vector-bits-vscale-range.c
@@ -9,11 +9,17 @@
 // RUN: %clang_cc1 -triple riscv64-none-linux-gnu -target-feature +v -mvscale-min=8 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=8 --check-prefix=CHECK-NOMAX
 // RUN: %clang_cc1 -triple riscv64-none-linux-gnu -target-feature +v -mvscale-min=16 -S -emit-llvm -o - %s | FileCheck %s -D#VBITS=16 --check-prefix=CHECK-NOMAX
 // RUN: %clang_cc1 -triple riscv64-none-linux-gnu -target-feature +v -mvscale-min=1 -mvscale-max=0 -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-UNBOUNDED
-// RUN: %clang_cc1 -triple riscv64-none-linux-gnu -target-feature +v -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-NONE
+// RUN: %clang_cc1 -triple riscv64-none-linux-gnu -target-feature +v -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-V
+// RUN: %clang_cc1 -triple riscv64-none-linux-gnu -target-feature +v -target-feature +zvl512b -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-ZVL
+// RUN: %clang_cc1 -triple riscv64-none-linux-gnu -target-feature +zve64x -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-ZVE64
+// RUN: %clang_cc1 -triple riscv64-none-linux-gnu -target-feature +zve64f -target-feature +f -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-ZVE64
+// RUN: %clang_cc1 -triple riscv64-none-linux-gnu -target-feature +zve64d -target-feature +f -target-feature +d -S -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK-ZVE64
 
 // CHECK-LABEL: @func() #0
 // CHECK: attributes #0 = { {{.*}} vscale_range([[#VBITS]],[[#VBITS]]) {{.*}} }
 // CHECK-NOMAX: attributes #0 = { {{.*}} vscale_range([[#VBITS]],0) {{.*}} }
 // CHECK-UNBOUNDED: attributes #0 = { {{.*}} vscale_range(1,0) {{.*}} }
-// CHECK-NONE: attributes #0 = { {{.*}} vscale_range(2,1024) {{.*}} }
+// CHECK-V: attributes #0 = { {{.*}} vscale_range(2,1024) {{.*}} }
+// CHECK-ZVL: attributes #0 = { {{.*}} vscale_range(8,1024) {{.*}} }
+// CHECK-ZVE64: attributes #0 = { {{.*}} vscale_range(1,1024) {{.*}} }
 void func(void) {}
Index: clang/lib/Basic/Targets/RISCV.cpp
===================================================================
--- clang/lib/Basic/Targets/RISCV.cpp
+++ clang/lib/Basic/Targets/RISCV.cpp
@@ -252,9 +252,11 @@
     return std::pair<unsigned, unsigned>(
         LangOpts.VScaleMin ? LangOpts.VScaleMin : 1, LangOpts.VScaleMax);
 
-  if (hasFeature("v"))
-    // Minimum VLEN=128, Maximum VLEN=64k, and RISCV::RVVBitsPerBlock is 64.
-    return std::pair<unsigned, unsigned>(2, 1024);
+  if (unsigned MinVLen = ISAInfo->getMinVLen()) {
+    unsigned MaxVLen = ISAInfo->getMaxVLen();
+    // RISCV::RVVBitsPerBlock is 64.
+    return std::pair<unsigned, unsigned>(MinVLen/64, MaxVLen/64);
+  }
 
   return None;
 }


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