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10 Commits

Author SHA1 Message Date
Chris Lattner d7f69cb7ef Implement rdar://7415680 - Twine integer support lacks greatness 
Microoptimize Twine's with unsigned and int to not pin their value to
the stack.  This saves stack space in common cases and allows mem2reg
in the caller.  A simple example is:

void foo(const Twine &);
void bar(int x) {
  foo("xyz: " + Twine(x));
}

Before:

__Z3bari:
	subq	$40, %rsp
	movl	%edi, 36(%rsp)
	leaq	L_.str3(%rip), %rax
	leaq	36(%rsp), %rcx
	leaq	8(%rsp), %rdi
	movq	%rax, 8(%rsp)
	movq	%rcx, 16(%rsp)
	movb	$3, 24(%rsp)
	movb	$7, 25(%rsp)
	callq	__Z3fooRKN4llvm5TwineE
	addq	$40, %rsp
	ret

After:

__Z3bari:
	subq	$24, %rsp
	leaq	L_.str3(%rip), %rax
	movq	%rax, (%rsp)
	movslq	%edi, %rax
	movq	%rax, 8(%rsp)
	movb	$3, 16(%rsp)
	movb	$7, 17(%rsp)
	leaq	(%rsp), %rdi
	callq	__Z3fooRKN4llvm5TwineE
	addq	$24, %rsp
	ret

It saves 16 bytes of stack and one instruction in this case.

llvm-svn: 103107
 2010-05-05 18:40:33 +00:00
Benjamin Kramer 2e06b93f43 Introduce Twine::toStringRef, a variant of toVector which avoids the copy if the 
twine can be represented as a single StringRef. Use the new methode to simplify
some twine users.

llvm-svn: 93317
 2010-01-13 12:45:23 +00:00
David Greene f92e6718bc Change errs() to dbgs(). 
llvm-svn: 92640
 2010-01-05 01:28:40 +00:00
Daniel Dunbar ea579e3d29 Switch Twine::str() to use toVector(), which is now efficient. 
llvm-svn: 79437
 2009-08-19 18:09:47 +00:00
Daniel Dunbar 2eaf396c41 Add missing flush(). 
llvm-svn: 77859
 2009-08-02 04:12:28 +00:00
Daniel Dunbar a91dd9bf5f Twine: Directly support int, long, and long long types. 
- This should resolve Cygwin gcc ambiguities.

llvm-svn: 77624
 2009-07-30 21:15:14 +00:00
Daniel Dunbar bd8556e0fb Twine: Use raw_ostream::write_hex, remove unused itohexstr method. 
llvm-svn: 77617
 2009-07-30 18:30:19 +00:00
Daniel Dunbar e8b3236284 Twine: Provide [u]int{32,64} conversions via implicit constructors instead of 
explicitly.

llvm-svn: 77576
 2009-07-30 03:47:15 +00:00
Daniel Dunbar b49994ad7e Twines: Support numeric conversion directly (uitostr, etc). 
- Provides static constructors for doing number to string conversions without
   using temporaries.

 - There are several ways to do this, I think given the Twine constraints this
   is the simplest one.

 - One FIXME for fast number -> hex conversion.

 - Added another comment on one last major bit of perf work Twines need, which
   is to make raw_svector_ostream more efficient.

llvm-svn: 77445
 2009-07-29 07:08:44 +00:00
Daniel Dunbar afcf5b30cb Add Twine ADT. 
- Not currently used.

llvm-svn: 76956
 2009-07-24 07:04:27 +00:00