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v.gen.native: improve few x64 generators (#10996)

pull/10999/head
pancake 2021-07-30 00:26:49 +02:00 committed by GitHub
parent 5a6d17786c
commit 6337325676
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 27 additions and 10 deletions
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37
vlib/v/gen/native/amd64.v
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@ -601,7 +601,7 @@ fn (mut g Gen) mov(reg Register, val int) {
g.write8(0xbc) // r11 is 0xbb etc
}
else {
panic('unhandled mov $reg')
verror('unhandled mov $reg')
}
}
g.write32(val)
@ -618,18 +618,17 @@ fn (mut g Gen) mul_reg(a Register, b Register) {
g.write8(0x48)
g.write8(0xf7)
g.write8(0xe8)
g.println('mul $a')
}
.rbx {
g.write8(0x48)
g.write8(0xf7)
g.write8(0xeb)
g.println('mul $a')
}
else {
panic('unhandled div $a')
}
}
g.println('mul $a')
}
fn (mut g Gen) div_reg(a Register, b Register) {
@ -641,19 +640,18 @@ fn (mut g Gen) div_reg(a Register, b Register) {
g.write8(0x48)
g.write8(0xf7)
g.write8(0xf8)
g.println('div $a')
}
.rbx {
g.mov(.edx, 0)
g.write8(0x48)
g.write8(0xf7)
g.write8(0xfb) // idiv ebx
g.println('div $a')
}
else {
panic('unhandled div $a')
}
}
g.println('div $a')
}
fn (mut g Gen) sub_reg(a Register, b Register) {
@ -661,10 +659,10 @@ fn (mut g Gen) sub_reg(a Register, b Register) {
g.write8(0x48)
g.write8(0x29)
g.write8(0xd8)
g.println('sub $a, $b')
} else {
panic('unhandled add $a, $b')
}
g.println('sub $a, $b')
}
fn (mut g Gen) add_reg(a Register, b Register) {
@ -672,10 +670,14 @@ fn (mut g Gen) add_reg(a Register, b Register) {
g.write8(0x48)
g.write8(0x01)
g.write8(0xd8)
g.println('add $a, $b')
} else if a == .rax && b == .rdi {
g.write8(0x48)
g.write8(0x01)
g.write8(0xf8)
} else {
panic('unhandled add $a, $b')
}
g.println('add $a, $b')
}
fn (mut g Gen) mov_reg(a Register, b Register) {
@ -690,6 +692,10 @@ fn (mut g Gen) mov_reg(a Register, b Register) {
g.write8(0x48)
g.write8(0x89)
g.write8(0xc8)
} else if a == .rax && b == .rdi {
g.write8(0x48)
g.write8(0x89)
g.write8(0xf8)
} else if a == .rdi && b == .rsi {
g.write8(0x48)
g.write8(0x89)
@ -701,6 +707,7 @@ fn (mut g Gen) mov_reg(a Register, b Register) {
} else {
verror('unhandled mov_reg combination for $a $b')
}
g.println('mov $a, $b')
}
// generates `mov rbp, rsp`
@ -918,10 +925,20 @@ fn (mut g Gen) assign_stmt(node ast.AssignStmt) {
ie := node.right[i] as ast.IndexExpr
var_name := ie.left.str()
mut dest := g.get_var_offset(var_name)
index := ie.index as ast.IntegerLiteral
dest += index.val.int() * 8
if ie.index is ast.IntegerLiteral {
index := ie.index
dest += index.val.int() * 8
g.mov_var_to_reg(.rax, dest)
} else if ie.index is ast.Ident {
ident := ie.index
var_offset := g.get_var_offset(ident.name)
g.mov_var_to_reg(.edi, var_offset)
g.mov_var_to_reg(.rax, dest)
g.add_reg(.rax, .rdi)
} else {
verror('only integers and idents can be used as indexes')
}
// TODO check if out of bounds access
g.mov_var_to_reg(.rax, dest)
g.mov_reg_to_var(offset, .eax)
}
ast.StringLiteral {