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handle sign extension of constants of various lengths

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This is a generalization of 9918ea6 which handles 8-bit and 16-bit as
well as 32-bit values.
This commit is contained in:
Joel Dice 2013-04-22 19:11:50 -06:00
parent d8729a7a8d
commit 68c3b241ce
1 changed files with 20 additions and 12 deletions
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32
src/codegen/target/x86/encode.cpp
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@ -24,6 +24,24 @@
using namespace avian::util;
namespace {
int64_t
signExtend(unsigned size, int64_t v)
{
if (size == 4) {
return static_cast<int32_t>(v);
} else if (size == 2) {
return static_cast<int16_t>(v);
} else if (size == 1) {
return static_cast<int8_t>(v);
} else {
return v;
}
}
} // namespace
namespace avian {
namespace codegen {
namespace x86 {
@ -328,11 +346,7 @@ void moveCR2(Context* c, UNUSED unsigned aSize, lir::Constant* a,
UNUSED unsigned bSize, lir::Register* b, unsigned promiseOffset)
{
if (vm::TargetBytesPerWord == 4 and bSize == 8) {
int64_t v = a->value->value();
if (aSize == 4) {
v = static_cast<int32_t>(v);
}
int64_t v = signExtend(aSize, a->value->value());
ResolvedPromise high((v >> 32) & 0xFFFFFFFF);
lir::Constant ah(&high);
@ -348,13 +362,7 @@ void moveCR2(Context* c, UNUSED unsigned aSize, lir::Constant* a,
maybeRex(c, vm::TargetBytesPerWord, b);
opcode(c, 0xb8 + regCode(b));
if (a->value->resolved()) {
int64_t v = a->value->value();
if (aSize == 4 and bSize == 8) {
v = static_cast<int32_t>(v);
}
c->code.appendTargetAddress(v);
c->code.appendTargetAddress(signExtend(aSize, a->value->value()));
} else {
expect(c, aSize == vm::TargetBytesPerWord);