llvm-6502/test/CodeGen/X86/fold-pcmpeqd-1.ll

; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 > %t
; RUN: grep pcmpeqd %t | count 1
; RUN: grep xor %t | count 1
; RUN: not grep LCP %t

define <2 x double> @foo() nounwind {
  ret <2 x double> bitcast (<2 x i64><i64 -1, i64 -1> to <2 x double>)
}
define <2 x double> @bar() nounwind {
  ret <2 x double> bitcast (<2 x i64><i64 0, i64 0> to <2 x double>)
}
Mark x86's V_SET0 and V_SETALLONES with isSimpleLoad, and teach X86's foldMemoryOperand how to "fold" them, by converting them into constant-pool loads. When they aren't folded, they use xorps/cmpeqd, but for example when register pressure is high, they may now be folded as memory operands, which reduces register pressure. Also, mark V_SET0 isAsCheapAsAMove so that two-address-elimination will remat it instead of copying zeros around (V_SETALLONES was already marked). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60461 91177308-0d34-0410-b5e6-96231b3b80d8 2008-12-03 05:21:24 +00:00			`; RUN: llvm-as < %s \| llc -march=x86 -mattr=+sse2 > %t`
			`; RUN: grep pcmpeqd %t \| count 1`
			`; RUN: grep xor %t \| count 1`
			`; RUN: not grep LCP %t`

			`define <2 x double> @foo() nounwind {`
			`ret <2 x double> bitcast (<2 x i64><i64 -1, i64 -1> to <2 x double>)`
			`}`
			`define <2 x double> @bar() nounwind {`
			`ret <2 x double> bitcast (<2 x i64><i64 0, i64 0> to <2 x double>)`
			`}`