diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c
index 58dac7292da..6d9ec8b4d9a 100644
--- a/src/amd/common/ac_llvm_build.c
+++ b/src/amd/common/ac_llvm_build.c
@@ -179,6 +179,20 @@ void ac_build_type_name_for_intr(LLVMTypeRef type, char *buf, unsigned bufsize)
 	}
 }
 
+/**
+ * Helper function that builds an LLVM IR PHI node and immediately adds
+ * incoming edges.
+ */
+LLVMValueRef
+ac_build_phi(struct ac_llvm_context *ctx, LLVMTypeRef type,
+	     unsigned count_incoming, LLVMValueRef *values,
+	     LLVMBasicBlockRef *blocks)
+{
+	LLVMValueRef phi = LLVMBuildPhi(ctx->builder, type, "");
+	LLVMAddIncoming(phi, values, blocks, count_incoming);
+	return phi;
+}
+
 LLVMValueRef
 ac_build_gather_values_extended(struct ac_llvm_context *ctx,
 				LLVMValueRef *values,
diff --git a/src/amd/common/ac_llvm_build.h b/src/amd/common/ac_llvm_build.h
index 0cfc9c696e3..f4f485d8bd4 100644
--- a/src/amd/common/ac_llvm_build.h
+++ b/src/amd/common/ac_llvm_build.h
@@ -78,6 +78,11 @@ ac_build_intrinsic(struct ac_llvm_context *ctx, const char *name,
 
 void ac_build_type_name_for_intr(LLVMTypeRef type, char *buf, unsigned bufsize);
 
+LLVMValueRef
+ac_build_phi(struct ac_llvm_context *ctx, LLVMTypeRef type,
+	     unsigned count_incoming, LLVMValueRef *values,
+	     LLVMBasicBlockRef *blocks);
+
 LLVMValueRef
 ac_build_gather_values_extended(struct ac_llvm_context *ctx,
 				LLVMValueRef *values,
diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 2bec7ff8b65..68a95153b4b 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -174,20 +174,6 @@ unsigned si_shader_io_get_unique_index(unsigned semantic_name, unsigned index)
 	}
 }
 
-/**
- * Helper function that builds an LLVM IR PHI node and immediately adds
- * incoming edges.
- */
-static LLVMValueRef
-build_phi(struct ac_llvm_context *ctx, LLVMTypeRef type,
-	  unsigned count_incoming, LLVMValueRef *values,
-	  LLVMBasicBlockRef *blocks)
-{
-	LLVMValueRef phi = LLVMBuildPhi(ctx->builder, type, "");
-	LLVMAddIncoming(phi, values, blocks, count_incoming);
-	return phi;
-}
-
 /**
  * Get the value of a shader input parameter and extract a bitfield.
  */
@@ -2732,15 +2718,15 @@ static void si_llvm_emit_tcs_epilogue(struct lp_build_tgsi_context *bld_base)
 
 		values[0] = rel_patch_id;
 		values[1] = LLVMGetUndef(ctx->i32);
-		rel_patch_id = build_phi(&ctx->ac, ctx->i32, 2, values, blocks);
+		rel_patch_id = ac_build_phi(&ctx->ac, ctx->i32, 2, values, blocks);
 
 		values[0] = tf_lds_offset;
 		values[1] = LLVMGetUndef(ctx->i32);
-		tf_lds_offset = build_phi(&ctx->ac, ctx->i32, 2, values, blocks);
+		tf_lds_offset = ac_build_phi(&ctx->ac, ctx->i32, 2, values, blocks);
 
 		values[0] = invocation_id;
 		values[1] = ctx->i32_1; /* cause the epilog to skip threads */
-		invocation_id = build_phi(&ctx->ac, ctx->i32, 2, values, blocks);
+		invocation_id = ac_build_phi(&ctx->ac, ctx->i32, 2, values, blocks);
 	}
 
 	/* Return epilog parameters from this function. */