Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(478)

Unified Diff: src/ia32/lithium-codegen-ia32.cc

Issue 23068038: Fix phis for non-sse2 double values (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: address comment & rebase Created 7 years, 3 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View side-by-side diff with in-line comments
Download patch
« no previous file with comments | « src/ia32/lithium-codegen-ia32.h ('k') | src/ia32/lithium-ia32.h » ('j') | no next file with comments »
Expand Comments ('e') | Collapse Comments ('c') | Show Comments Hide Comments ('s')
Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 860646c2fd60417e2fdfe5640eabe15cb61c0211..f502b658a7683981ee6079e86a97f099ffa7ad86 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -382,9 +382,13 @@ bool LCodeGen::GenerateBody() {
instr->CompileToNative(this);
- if (!CpuFeatures::IsSupported(SSE2) &&
- FLAG_debug_code && FLAG_enable_slow_asserts) {
+ if (!CpuFeatures::IsSupported(SSE2)) {
+ if (instr->IsGoto()) {
+ x87_stack_.LeavingBlock(current_block_, LGoto::cast(instr));
+ } else if (FLAG_debug_code && FLAG_enable_slow_asserts &&
+ !instr->IsGap() && !instr->IsReturn()) {
__ VerifyX87StackDepth(x87_stack_.depth());
+ }
}
}
EnsureSpaceForLazyDeopt();
@@ -682,6 +686,21 @@ void LCodeGen::X87Stack::FlushIfNecessary(LInstruction* instr, LCodeGen* cgen) {
__ fstp(0);
stack_depth_--;
}
+ __ VerifyX87StackDepth(0);
+ }
+}
+
+
+void LCodeGen::X87Stack::LeavingBlock(int current_block_id, LGoto* goto_instr) {
+ ASSERT(stack_depth_ <= 1);
+ // If ever used for new stubs producing two pairs of doubles joined into two
+ // phis this assert hits. That situation is not handled, since the two stacks
+ // might have st0 and st1 swapped.
+ if (current_block_id + 1 != goto_instr->block_id()) {
+ // If we have a value on the x87 stack on leaving a block, it must be a
+ // phi input. If the next block we compile is not the join block, we have
+ // to discard the stack state.
+ stack_depth_ = 0;
}
}
@@ -2486,6 +2505,10 @@ void LCodeGen::EmitGoto(int block) {
}
+void LCodeGen::DoClobberDoubles(LClobberDoubles* instr) {
+}
+
+
void LCodeGen::DoGoto(LGoto* instr) {
EmitGoto(instr->block_id());
}
« no previous file with comments | « src/ia32/lithium-codegen-ia32.h ('k') | src/ia32/lithium-ia32.h » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld 408576698