[PATCH] D14307: AMDGPU: Add support for 's' and 'v' asm constraints

[Tom Stellard via cfe-commits]

tstellarAMD created this revision.
tstellarAMD added reviewers: echristo, arsenm.
tstellarAMD added a subscriber: cfe-commits.

's' is used to specify sgprs and 'v' is used to specify vgprs.

http://reviews.llvm.org/D14307

Files:
  lib/Basic/Targets.cpp
  test/Sema/inline-asm-validate-amdgpu.cl

Index: test/Sema/inline-asm-validate-amdgpu.cl
===================================================================
--- /dev/null
+++ test/Sema/inline-asm-validate-amdgpu.cl
@@ -0,0 +1,14 @@
+// REQUIRES: amdgpu-registered-target
+// RUN: %clang_cc1 -x cl -triple amdgcn -fsyntax-only  %s
+// expected-no-diagnostics
+
+kernel void test () {
+
+  int sgpr = 0, vgpr = 0, imm = 0;
+
+  // sgpr constraints
+  __asm__ ("s_mov_b32 %0, %1" : "=s" (sgpr) : "s" (imm) : );
+
+  // vgpr constraints
+  __asm__ ("v_mov_b32 %0, %1" : "=v" (vgpr) : "v" (imm) : );
+}
Index: lib/Basic/Targets.cpp
===================================================================
--- lib/Basic/Targets.cpp
+++ lib/Basic/Targets.cpp
@@ -1826,8 +1826,15 @@
   }
 
   bool validateAsmConstraint(const char *&Name,
-                             TargetInfo::ConstraintInfo &info) const override {
-    return true;
+                             TargetInfo::ConstraintInfo &Info) const override {
+    switch (*Name) {
+    default: break;
+    case 'v': // vgpr
+    case 's': // sgpr
+      Info.setAllowsRegister();
+      return true;
+    }
+    return false;
   }
 
   ArrayRef<Builtin::Info> getTargetBuiltins() const override {


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