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Add comments and remove unneeded statics.

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This commit is contained in:
losfair 2019-12-03 01:46:06 +08:00
parent 063fa211a7
commit 04d8df0a46
1 changed files with 20 additions and 15 deletions
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35
lib/singlepass-backend/src/codegen_x64.rs
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@ -240,15 +240,18 @@ pub struct X64ExecutionContext {
}
/// On-disk cache format.
/// Offsets are relative to the start of the executable image.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct CacheImage {
/// Code for the whole module.
/// The executable image.
code: Vec<u8>,
/// Offsets to the beginnings of each function (including trampoline, if any).
/// Offsets to the start of each function. Including trampoline, if any.
/// Trampolines are only present on AArch64.
/// On x86-64, `function_pointers` are identical to `function_offsets`.
function_pointers: Vec<usize>,
/// Offsets to the beginnings of each function after trampoline.
/// Offsets to the start of each function after trampoline.
function_offsets: Vec<usize>,
/// Number of imported functions.
@ -3482,7 +3485,6 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
let tmp_xmm2 = XMM::XMM9;
let tmp_xmm3 = XMM::XMM10;
static CANONICAL_NAN: u32 = 0x7FC0_0000;
a.emit_mov(Size::S32, Location::XMM(src1), Location::GPR(tmpg1));
a.emit_mov(Size::S32, Location::XMM(src2), Location::GPR(tmpg2));
a.emit_cmp(Size::S32, Location::GPR(tmpg2), Location::GPR(tmpg1));
@ -3501,7 +3503,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
// load float canonical nan
a.emit_mov(
Size::S64,
Location::Imm32(CANONICAL_NAN),
Location::Imm32(0x7FC0_0000), // Canonical NaN
Location::GPR(tmpg1),
);
a.emit_mov(Size::S64, Location::GPR(tmpg1), Location::XMM(src2));
@ -3594,8 +3596,6 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
let tmp_xmm2 = XMM::XMM9;
let tmp_xmm3 = XMM::XMM10;
static NEG_ZERO: u32 = 0x8000_0000;
static CANONICAL_NAN: u32 = 0x7FC0_0000;
a.emit_mov(Size::S32, Location::XMM(src1), Location::GPR(tmpg1));
a.emit_mov(Size::S32, Location::XMM(src2), Location::GPR(tmpg2));
a.emit_cmp(Size::S32, Location::GPR(tmpg2), Location::GPR(tmpg1));
@ -3607,7 +3607,11 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
a.emit_jmp(Condition::None, label2);
a.emit_label(label1);
// load float -0.0
a.emit_mov(Size::S64, Location::Imm32(NEG_ZERO), Location::GPR(tmpg1));
a.emit_mov(
Size::S64,
Location::Imm32(0x8000_0000), // Negative zero
Location::GPR(tmpg1),
);
a.emit_mov(Size::S64, Location::GPR(tmpg1), Location::XMM(tmp_xmm2));
a.emit_label(label2);
a.emit_vcmpeqss(src1, XMMOrMemory::XMM(src2), tmp_xmm3);
@ -3616,7 +3620,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
// load float canonical nan
a.emit_mov(
Size::S64,
Location::Imm32(CANONICAL_NAN),
Location::Imm32(0x7FC0_0000), // Canonical NaN
Location::GPR(tmpg1),
);
a.emit_mov(Size::S64, Location::GPR(tmpg1), Location::XMM(src2));
@ -3898,7 +3902,6 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
let tmp_xmm2 = XMM::XMM9;
let tmp_xmm3 = XMM::XMM10;
static CANONICAL_NAN: u64 = 0x7FF8_0000_0000_0000;
a.emit_mov(Size::S64, Location::XMM(src1), Location::GPR(tmpg1));
a.emit_mov(Size::S64, Location::XMM(src2), Location::GPR(tmpg2));
a.emit_cmp(Size::S64, Location::GPR(tmpg2), Location::GPR(tmpg1));
@ -3917,7 +3920,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
// load float canonical nan
a.emit_mov(
Size::S64,
Location::Imm64(CANONICAL_NAN),
Location::Imm64(0x7FF8_0000_0000_0000), // Canonical NaN
Location::GPR(tmpg1),
);
a.emit_mov(Size::S64, Location::GPR(tmpg1), Location::XMM(src2));
@ -4010,8 +4013,6 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
let tmp_xmm2 = XMM::XMM9;
let tmp_xmm3 = XMM::XMM10;
static NEG_ZERO: u64 = 0x8000_0000_0000_0000;
static CANONICAL_NAN: u64 = 0x7FF8_0000_0000_0000;
a.emit_mov(Size::S64, Location::XMM(src1), Location::GPR(tmpg1));
a.emit_mov(Size::S64, Location::XMM(src2), Location::GPR(tmpg2));
a.emit_cmp(Size::S64, Location::GPR(tmpg2), Location::GPR(tmpg1));
@ -4023,7 +4024,11 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
a.emit_jmp(Condition::None, label2);
a.emit_label(label1);
// load float -0.0
a.emit_mov(Size::S64, Location::Imm64(NEG_ZERO), Location::GPR(tmpg1));
a.emit_mov(
Size::S64,
Location::Imm64(0x8000_0000_0000_0000), // Negative zero
Location::GPR(tmpg1),
);
a.emit_mov(Size::S64, Location::GPR(tmpg1), Location::XMM(tmp_xmm2));
a.emit_label(label2);
a.emit_vcmpeqsd(src1, XMMOrMemory::XMM(src2), tmp_xmm3);
@ -4032,7 +4037,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
// load float canonical nan
a.emit_mov(
Size::S64,
Location::Imm64(CANONICAL_NAN),
Location::Imm64(0x7FF8_0000_0000_0000), // Canonical NaN
Location::GPR(tmpg1),
);
a.emit_mov(Size::S64, Location::GPR(tmpg1), Location::XMM(src2));