From 64a0510205b4d224413de52fd87632fbe6bfe083 Mon Sep 17 00:00:00 2001 From: Andrew Kelley Date: Sat, 4 Feb 2017 22:33:58 -0500 Subject: inline assembly supports `%=` syntax it outputs a number that is unique to each instance of the asm statement in the entire compilation. useful when creating local labels and referring to them multiple times in a single template that generates multiple assembler instructions --- src/codegen.cpp | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) (limited to 'src/codegen.cpp') diff --git a/src/codegen.cpp b/src/codegen.cpp index 9ade5cda42..3328bc3de4 100644 --- a/src/codegen.cpp +++ b/src/codegen.cpp @@ -1481,6 +1481,9 @@ static LLVMValueRef ir_render_asm(CodeGen *g, IrExecutable *executable, IrInstru Buf llvm_template = BUF_INIT; buf_resize(&llvm_template, 0); + uint32_t unique_id = g->unique_asm_id; + g->unique_asm_id += 1; + for (size_t token_i = 0; token_i < asm_expr->token_list.length; token_i += 1) { AsmToken *asm_token = &asm_expr->token_list.at(token_i); switch (asm_token->id) { @@ -1498,9 +1501,14 @@ static LLVMValueRef ir_render_asm(CodeGen *g, IrExecutable *executable, IrInstru buf_append_char(&llvm_template, '%'); break; case AsmTokenIdVar: - size_t index = find_asm_index(g, asm_node, asm_token); - assert(index < SIZE_MAX); - buf_appendf(&llvm_template, "$%zu", index); + { + size_t index = find_asm_index(g, asm_node, asm_token); + assert(index < SIZE_MAX); + buf_appendf(&llvm_template, "$%zu", index); + break; + } + case AsmTokenIdUniqueId: + buf_appendf(&llvm_template, "%" PRIu32, unique_id); break; } } -- cgit v1.2.3