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inline assembly supports %= syntax

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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
This commit is contained in:
Andrew Kelley
2017-02-04 22:33:58 -05:00
parent b840184bb0
commit 64a0510205
3 changed files with 18 additions and 3 deletions
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14
src/codegen.cpp
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@@ -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;
}
}