Chris Lattner 26a971c4ec Move 3 "(add (select cc, 0, c), x) -> (select cc, x, (add, x, c))" ... related transformations out of target-specific dag combine into the ARM backend. These were added by Evan in r37685 with no testcases and only seems to help ARM (e.g. test/CodeGen/ARM/select_xform.ll). Add some simple X86-specific (for now) DAG combines that turn things like cond ? 8 : 0 -> (zext(cond) << 3). This happens frequently with the recently added cp constant select optimization, but is a very general xform. For example, we now compile the second example in const-select.ll to: _test: movsd LCPI2_0, %xmm0 ucomisd 8(%esp), %xmm0 seta %al movzbl %al, %eax movl 4(%esp), %ecx movsbl (%ecx,%eax,4), %eax ret instead of: _test: movl 4(%esp), %eax leal 4(%eax), %ecx movsd LCPI2_0, %xmm0 ucomisd 8(%esp), %xmm0 cmovbe %eax, %ecx movsbl (%ecx), %eax ret This passes multisource and dejagnu. llvm-svn: 66779		2009-03-12 06:52:53 +00:00
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Alpha
ARM	add no-unwind, remove duplicate run line.	2009-03-12 05:56:37 +00:00
CBackend
CellSPU	Used "-enable-unsafe-fp-math" to allow this transformation - (a * b -c) = c - a *b.	2009-01-31 06:50:54 +00:00
CPP
Generic	wire up support for emitting "special" values from inline asm	2009-03-10 05:37:13 +00:00
IA64
Mips
PowerPC	Private linkage support for PPC / Darwin.	2009-01-25 06:32:01 +00:00
SPARC
X86	Move 3 "(add (select cc, 0, c), x) -> (select cc, x, (add, x, c))"	2009-03-12 06:52:53 +00:00
XCore