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Skip back edge creation for "do ... while(false)" loops

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Drive-by fix: Fix disassembling "prefetch" instruction on ia32

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/131733002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18519 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
jkummerow@chromium.org 2014-01-09 15:20:25 +00:00
parent 380aa6dc8d
commit 839297487f
2 changed files with 11 additions and 5 deletions
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15
src/hydrogen.cc
View File

@ -4336,12 +4336,17 @@ void HOptimizedGraphBuilder::VisitDoWhileStatement(DoWhileStatement* stmt) {
HBasicBlock* loop_successor = NULL;
if (body_exit != NULL && !stmt->cond()->ToBooleanIsTrue()) {
set_current_block(body_exit);
// The block for a true condition, the actual predecessor block of the
// back edge.
body_exit = graph()->CreateBasicBlock();
loop_successor = graph()->CreateBasicBlock();
CHECK_BAILOUT(VisitForControl(stmt->cond(), body_exit, loop_successor));
if (body_exit->HasPredecessor()) {
if (stmt->cond()->ToBooleanIsFalse()) {
Goto(loop_successor);
body_exit = NULL;
} else {
// The block for a true condition, the actual predecessor block of the
// back edge.
body_exit = graph()->CreateBasicBlock();
CHECK_BAILOUT(VisitForControl(stmt->cond(), body_exit, loop_successor));
}
if (body_exit != NULL && body_exit->HasPredecessor()) {
body_exit->SetJoinId(stmt->BackEdgeId());
} else {
body_exit = NULL;

1
src/ia32/disasm-ia32.cc
View File

@ -1007,6 +1007,7 @@ int DisassemblerIA32::InstructionDecode(v8::internal::Vector<char> out_buffer,
{ byte f0byte = data[1];
const char* f0mnem = F0Mnem(f0byte);
if (f0byte == 0x18) {
data += 2;
int mod, regop, rm;
get_modrm(*data, &mod, &regop, &rm);
const char* suffix[] = {"nta", "1", "2", "3"};