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CBE: addition and subtraction

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This commit is contained in:
Noam Preil 2020-09-08 14:39:47 -04:00
parent e06ba9e86e
commit ea7b2750c8
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GPG Key ID: FC347E7C85BE8238
2 changed files with 63 additions and 0 deletions
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15
src/codegen/c.zig
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@ -160,6 +160,8 @@ fn genFn(file: *C, decl: *Decl) !void {
if (switch (inst.tag) {
.assembly => try genAsm(&ctx, inst.castTag(.assembly).?),
.call => try genCall(&ctx, inst.castTag(.call).?),
.add => try genBinOp(&ctx, inst.cast(Inst.BinOp).?, "+"),
.sub => try genBinOp(&ctx, inst.cast(Inst.BinOp).?, "-"),
.ret => try genRet(&ctx, inst.castTag(.ret).?),
.retvoid => try genRetVoid(&ctx),
.arg => try genArg(&ctx),
@ -207,6 +209,19 @@ fn genIntCast(ctx: *Context, inst: *Inst.UnOp) !?[]u8 {
return name;
}
fn genBinOp(ctx: *Context, inst: *Inst.BinOp, comptime operator: []const u8) !?[]u8 {
if (inst.base.isUnused())
return null;
const lhs = ctx.resolveInst(inst.lhs);
const rhs = ctx.resolveInst(inst.rhs);
const writer = ctx.file.main.writer();
const name = try ctx.name();
try writer.writeAll(indentation ++ "const ");
try renderType(ctx, writer, inst.base.ty);
try writer.print(" {} = {} " ++ operator ++ " {};\n", .{ name, lhs, rhs });
return name;
}
fn genCall(ctx: *Context, inst: *Inst.Call) !?[]u8 {
const writer = ctx.file.main.writer();
const header = ctx.file.header.writer();

48
test/stage2/cbe.zig
View File

@ -147,4 +147,52 @@ pub fn addCases(ctx: *TestContext) !void {
\\}
\\
);
ctx.c("exit with u8 arithmetic", linux_x64,
\\export fn _start() noreturn {
\\ exitMath(1);
\\}
\\
\\fn exitMath(a: u8) noreturn {
\\ exit(0 + a - a);
\\}
\\
\\fn exit(code: u8) noreturn {
\\ asm volatile ("syscall"
\\ :
\\ : [number] "{rax}" (231),
\\ [arg1] "{rdi}" (code)
\\ );
\\ unreachable;
\\}
\\
,
\\#include <stddef.h>
\\#include <stdint.h>
\\
\\zig_noreturn void exitMath(uint8_t arg0);
\\zig_noreturn void exit(uint8_t arg0);
\\
\\const char *const exit__anon_0 = "{rax}";
\\const char *const exit__anon_1 = "{rdi}";
\\const char *const exit__anon_2 = "syscall";
\\
\\zig_noreturn void _start(void) {
\\ exitMath(1);
\\}
\\
\\zig_noreturn void exitMath(uint8_t arg0) {
\\ const uint8_t __temp_0 = 0 + arg0;
\\ const uint8_t __temp_1 = __temp_0 - arg0;
\\ exit(__temp_1);
\\}
\\
\\zig_noreturn void exit(uint8_t arg0) {
\\ const size_t __temp_0 = (size_t)arg0;
\\ register size_t rax_constant __asm__("rax") = 231;
\\ register size_t rdi_constant __asm__("rdi") = __temp_0;
\\ __asm volatile ("syscall" :: ""(rax_constant), ""(rdi_constant));
\\ zig_unreachable();
\\}
\\
);
}