Bob Wilson fe61fb1e10 Add a new pass on machine instructions to optimize away PHI cycles that ... reduce down to a single value. InstCombine already does this transformation but DAG legalization may introduce new opportunities. This has turned out to be important for ARM where 64-bit values are split up during type legalization: InstCombine is not able to remove the PHI cycles on the 64-bit values but the separate 32-bit values can be optimized. I measured the compile time impact of this (running llc on 176.gcc) and it was not significant. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95951 91177308-0d34-0410-b5e6-96231b3b80d8		2010-02-12 01:30:21 +00:00
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Alpha	Delete useless trailing semicolons.	2010-01-05 17:55:26 +00:00
ARM	Delete dead PHI machine instructions. These can be created due to type	2010-02-10 22:58:57 +00:00
Blackfin	Teach dag combine to fold the following transformation more aggressively:	2010-01-06 19:38:29 +00:00
CBackend	Eliminate more uses of llvm-as and llvm-dis.	2009-09-09 00:09:15 +00:00
CellSPU	don't let asm-verbose break the check-next lines in these tests.	2010-01-19 06:39:54 +00:00
CPP	fix PR5295 where the .ll parser didn't reject a function after a global	2009-10-25 23:22:50 +00:00
Generic	move tests that depend on the x86 backend out of codegen/generic,	2010-02-09 06:41:03 +00:00
Mips	Delete useless trailing semicolons.	2010-01-05 17:55:26 +00:00
MSP430	Reenable tests	2010-01-15 21:19:26 +00:00
PIC16	emit integer and fp zeros as (e.g.) .byte 0 instead of .space 1,	2010-01-20 07:19:19 +00:00
PowerPC	Fix alignment on ppc linux. This fixes the build of crtend.o	2010-02-06 03:32:21 +00:00
SPARC	add support for the sparcv9-*-* target triple to turn on	2010-02-04 06:34:01 +00:00
SystemZ	Teach dag combine to fold the following transformation more aggressively:	2010-01-06 19:38:29 +00:00
Thumb	Run the pre-register allocation tail duplication pass by default. Remove	2010-01-16 00:29:50 +00:00
Thumb2	Add a new pass on machine instructions to optimize away PHI cycles that	2010-02-12 01:30:21 +00:00
X86	Reapply coalescer fix for better cross-class coalescing.	2010-02-11 23:55:29 +00:00
XCore	convert the last 3 targets to use EmitFunctionBody() now that	2010-01-28 06:22:43 +00:00