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    • Daniel Dunbar's avatar
      IRgen improvements on unreachable code: · 5fc28718
      Daniel Dunbar authored 
       - Split out "simple" statements which can easily handle IR generation
   when there is no insert point. These are generally statements which
   start by emitting a new block or are only containers for other
   statements.

 - This fixes a regression in emitting dummy blocks, notably for case
   statements.

 - This also fixes spurious emission of a number of debug stoppoint
   intrinsic instructions.

Remove unneeded sw.body block, just clear the insertion point.

Lift out CodeGenFunction::EmitStopPoint which calls into the
CGDebugInfo class when generating debug info.

Normalize definitions of Emit{Break,Continue}Stmt and usage of
ErrorUnsupported.

llvm-svn: 59118
      5fc28718
    • Chris Lattner's avatar
      Move EmitBranchOnBoolExpr and ConstantFoldsToSimpleInteger to · cd439299
      Chris Lattner authored 
      CodeGenFunction.cpp.  Change VisitConditionalOperator to use
constant fold instead of codegen'ing a constant conditional.

Change ForStmt to use EmitBranchOnBoolExpr, this shrinks
expr.c very slightly to 40239 lines.

llvm-svn: 59113
      cd439299
    • Chris Lattner's avatar
      Make emission of 'if' conditions much more sophisticated when we · b7a9e164
      Chris Lattner authored 
      have a condition that is an &&/||.  Before we used to compile things like this:

int test() {
  if (x && y) foo(); else bar();
}

into:

	%0 = load i32* @x		; <i32> [#uses=1]
	%1 = icmp ne i32 %0, 0		; <i1> [#uses=1]
	br i1 %1, label %land_rhs, label %land_cont

land_rhs:		; preds = %entry
	%2 = load i32* @y		; <i32> [#uses=1]
	%3 = icmp ne i32 %2, 0		; <i1> [#uses=1]
	br label %land_cont

land_cont:		; preds = %land_rhs, %entry
	%4 = phi i1 [ false, %entry ], [ %3, %land_rhs ]		; <i1> [#uses=1]
	br i1 %4, label %ifthen, label %ifelse

ifthen:		; preds = %land_cont
	%call = call i32 (...)* @foo()		; <i32> [#uses=0]
	br label %ifend

ifelse:		; preds = %land_cont
	%call1 = call i32 (...)* @bar()		; <i32> [#uses=0]
	br label %ifend

ifend:		; preds = %ifelse, %ifthen


Now we turn it into the much more svelte code:

        %0 = load i32* @x               ; <i32> [#uses=1]
        %1 = icmp ne i32 %0, 0          ; <i1> [#uses=1]
        br i1 %1, label %land_lhs_true, label %ifelse

land_lhs_true:          ; preds = %entry
        %2 = load i32* @y               ; <i32> [#uses=1]
        %3 = icmp ne i32 %2, 0          ; <i1> [#uses=1]
        br i1 %3, label %ifthen, label %ifelse

ifthen:         ; preds = %land_lhs_true
        %call = call i32 (...)* @foo()          ; <i32> [#uses=0]
        br label %ifend

ifelse:         ; preds = %land_lhs_true, %entry
        %call1 = call i32 (...)* @bar()         ; <i32> [#uses=0]
        br label %ifend

ifend:          ; preds = %ifelse, %ifthen

Note the lack of a phi node.

This shrinks the -O0 .ll file for 176.gcc/expr.c from 43176 to 40267 lines.

llvm-svn: 59111
      b7a9e164
    • Chris Lattner's avatar
      Clean up some code to use isZero instead of calling getZExtValue. · 4ad31fcc
      Chris Lattner authored 
      llvm-svn: 59103
      4ad31fcc
    • Daniel Dunbar's avatar
      Rework IRgen invariant w.r.t. current insert point. · 5c7e3935
      Daniel Dunbar authored 
       - EmitStmt is no longer required to finish with a current insertion
   point defined (i.e. it does not need to make dummy
   blocks). Instead, it can clear the insertion point in the builder
   which indicates that the current insertion point is unreachable.
 - CodeGenFunction provides HaveInsertPoint and EnsureInsertPoint
   which respectively test if there is an insert point and ensure an
   insertion point exists (by making a dummy block).
 - Clearly mark functions in CodeGenFunction which can be called with
   no insertion point defined. Currently this is a limited set, and
   EmitStmt simply EnsureInsertPoint()s before emitting subsequent IR.

Remove EmitDummyBlock, which is no longer needed. Clients who haven't
already cleared the insertion point (typically via EmitBranch) can do
so by hand.

Remove isDummyBlock, which has effectively been renamed to
HaveInsertPoint.

The main thrust of this change is that we no longer have create dummy
blocks just to destroy them a short time later in EmitBlock in the
common case that there is no unreachable code following something like
a goto. 

Additionally, this means that we are not using the hokey condition in
isDummyBlock that a block without a name is a dummy block. Guess how
well that works when we never emit block names!

llvm-svn: 59089
      5c7e3935
  35. Nov 11, 2008