llvm-6502

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Commit Graph

Author	SHA1	Message	Date
Jim Grosbach	e1af5f6ad1	X86: Perform integer comparisons at i32 or larger. Utilizing the 8 and 16 bit comparison instructions, even when an input can be folded into the comparison instruction itself, is typically not worth it. There are too many partial register stalls as a result, leading to significant slowdowns. By always performing comparisons on at least 32-bit registers, performance of the calculation chain leading to the comparison improves. Continue to use the smaller comparisons when minimizing size, as that allows better folding of loads into the comparison instructions. rdar://15386341 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195496 91177308-0d34-0410-b5e6-96231b3b80d8	2013-11-22 19:57:47 +00:00
NAKAMURA Takumi	39109a3ce9	Relax expressions and add explicit triplets -linux and -win32. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126198 91177308-0d34-0410-b5e6-96231b3b80d8	2011-02-22 07:19:28 +00:00
Dan Gohman	b00f236b03	Move zext and sext casts fed by loads into the same block as the load, to help SelectionDAG fold them into the loads, unless conditions are unfavorable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84271 91177308-0d34-0410-b5e6-96231b3b80d8	2009-10-16 20:59:35 +00:00

Author

SHA1

Message

Date

Jim Grosbach

e1af5f6ad1

X86: Perform integer comparisons at i32 or larger.

Utilizing the 8 and 16 bit comparison instructions, even when an input can
be folded into the comparison instruction itself, is typically not worth it.
There are too many partial register stalls as a result, leading to significant
slowdowns. By always performing comparisons on at least 32-bit
registers, performance of the calculation chain leading to the
comparison improves. Continue to use the smaller comparisons when
minimizing size, as that allows better folding of loads into the
comparison instructions.

rdar://15386341

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195496 91177308-0d34-0410-b5e6-96231b3b80d8

2013-11-22 19:57:47 +00:00

NAKAMURA Takumi

39109a3ce9

Relax expressions and add explicit triplets -linux and -win32.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126198 91177308-0d34-0410-b5e6-96231b3b80d8

2011-02-22 07:19:28 +00:00

Dan Gohman

b00f236b03

Move zext and sext casts fed by loads into the same block as the

load, to help SelectionDAG fold them into the loads, unless
conditions are unfavorable.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84271 91177308-0d34-0410-b5e6-96231b3b80d8

2009-10-16 20:59:35 +00:00

3 Commits