expressions.
 - This generally catches the important case of noreturn functions.

 - With the last two changes, we are down to 152 unreachable blocks emitted on
   403.gcc, vs the 1805 we started with.

llvm-svn: 76364

llvm-svn: 76362

 - Emit variable declarations as "simple", we want to avoid forcing the creation
   of a dummy basic block, but still need to make the variable available for
   later use.

 - With that, we can now skip IRgen for other unreachable statements (which
   don't define a label).

 - Anders, I added two fixmes on calls to EmitVLASize, can you check them?

llvm-svn: 76361

llvm-svn: 76090

type.

llvm-svn: 72459

llvm-svn: 72439

llvm-svn: 72210

function calls.  For a program like this:

#include <stdio.h>
static __inline__ __attribute__((always_inline)) 
int bar(int x) { return 4; }
int main() { 
  int X = bar(4);
  printf("%d\n", X);
}

clang was not outputing any debug info for the body of main().  This is
because the backend is getting confused by the region_start/end that clang
is emitting for block scopes.  For now, just disable these (matching llvm-gcc),
this stuff is in progress of rework anyway.

llvm-svn: 70889

llvm-svn: 70835

hopefully, this fixes PR4144 without any regressions.

llvm-svn: 70823

this fixes http://llvm.org/bugs/show_bug.cgi?id=3373#c20

llvm-svn: 70685

llvm-svn: 70680

the input.  This is part of PR3373.

llvm-svn: 70677

like bitfields.  incidentally llvm-gcc crashes on this sort of thing also. :)

llvm-svn: 70675

llvm-svn: 70672

processing the outputs, no functionality change.

llvm-svn: 70671

llvm-svn: 70523

llvm-svn: 70136

instead of passing it around in addition to it.

llvm-svn: 70135

the enum along with some other data.

llvm-svn: 70114

llvm-svn: 68992

 - <rdar://problem/6732143> Crash when generating @synchronize for
   zero-cost exception

 - Thanks to Anders for helping track down the problem.

llvm-svn: 68186

really horrible extensions that are disabled by default but that can
be accepted by -fheinous-gnu-extensions (but which always emit a 
warning when enabled).

As our first instance of this, implement PR3788/PR3794, which allows
non-lvalues in inline asms in contexts where lvalues are required. bleh.

llvm-svn: 66910

llvm-svn: 66598

code where Sema can get to it.  No functionality change.

llvm-svn: 66596

done in sema, and is reflected by the existing PR3258.  In the meantime,
fix PR3682 by disabling a bogus assertion (which doesn't account for + 
operands).

llvm-svn: 66533

add support for modifiers on named references, like %c[foo].

llvm-svn: 66532

time handle + operands in operand counting, fixing asm.c:t7 to
expand into $2 instead of $1.

llvm-svn: 66531

temporary std::string to fix a fixme.

llvm-svn: 66530

asm.  This allows us to properly handle the case when an optimizer duplicates
the asm, such as here:

void bar() {
  int i;
  for (i = 0; i < 3; ++i)
    asm("foo %=" : : "r"(0));
}

we now produce:

_bar:
	xorl	%eax, %eax
	## InlineAsm Start
	foo 0
	## InlineAsm End
	## InlineAsm Start
	foo 1
	## InlineAsm End
	## InlineAsm Start
	foo 2
	## InlineAsm End
	ret

instead of:

_bar:
	xorl	%eax, %eax
	## InlineAsm Start
	foo 1
	## InlineAsm End
	## InlineAsm Start
	foo 1
	## InlineAsm End
	## InlineAsm Start
	foo 1
	## InlineAsm End
	ret

This also fixes a fixme by eliminating a static.

llvm-svn: 66528

llvm-svn: 66521

ConvertAsmString and shrink it a bit.  No functionality change.

llvm-svn: 66520

it in the stack trace, giving us stuff like:

Stack dump:
0.	Program arguments: clang t.c -emit-llvm 
1.	<eof> parser at end of file
2.	t.c:1:5: LLVM IR generation of declaration 'a'
3.	t.c:1:9: LLVM IR generation of compound statement ('{}')
4.	t.c:2:3: LLVM IR generation of compound statement ('{}')
Abort

llvm-svn: 66154

multiple sequential cases to a) not create tons of fall-through basic blocks
and b) not recurse deeply.  This fixes codegen on 100K deep cases, and improves
codegen on moderate cases from this:

        switch i32 %tmp, label %sw.epilog [
                i32 1000, label %sw.bb
                i32 1001, label %sw.bb1
                i32 1002, label %sw.bb2
                i32 1003, label %sw.bb3
                i32 1004, label %sw.bb4
...
sw.bb:          ; preds = %entry
        br label %sw.bb1

sw.bb1:         ; preds = %entry, %sw.bb
        br label %sw.bb2

sw.bb2:         ; preds = %entry, %sw.bb1
        br label %sw.bb3

sw.bb3:         ; preds = %entry, %sw.bb2
        br label %sw.bb4

to:

        switch i32 %tmp, label %sw.epilog [
                i32 1000, label %sw.bb
                i32 1001, label %sw.bb
                i32 1002, label %sw.bb
                i32 1003, label %sw.bb
                i32 1004, label %sw.bb
sw.bb:  ;; many preds

llvm-svn: 66015

llvm-svn: 65866

Make sure to reset the DidCallStackSave variable before emitting a compound statement. Fixes PR3649.

llvm-svn: 65291

llvm-svn: 64445

llvm-svn: 64252

llvm-svn: 64205

llvm-svn: 64203