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Add hasSideEffects=0 to some shift and rotate instructions. None of which are currently used by code generation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171137 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2012-12-27 03:35:44 +00:00
parent 766cbae4b1
commit 87073aad8f
1 changed files with 5 additions and 1 deletions
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6
lib/Target/X86/X86InstrShiftRotate.td
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@ -51,6 +51,7 @@ def SHL64ri : RIi8<0xC1, MRM4r, (outs GR64:$dst),
// NOTE: We don't include patterns for shifts of a register by one, because
// 'add reg,reg' is cheaper (and we have a Pat pattern for shift-by-one).
let hasSideEffects = 0 in {
def SHL8r1 : I<0xD0, MRM4r, (outs GR8:$dst), (ins GR8:$src1),
"shl{b}\t$dst", [], IIC_SR>;
def SHL16r1 : I<0xD1, MRM4r, (outs GR16:$dst), (ins GR16:$src1),
@ -59,8 +60,9 @@ def SHL32r1 : I<0xD1, MRM4r, (outs GR32:$dst), (ins GR32:$src1),
"shl{l}\t$dst", [], IIC_SR>;
def SHL64r1 : RI<0xD1, MRM4r, (outs GR64:$dst), (ins GR64:$src1),
"shl{q}\t$dst", [], IIC_SR>;
} // hasSideEffects = 0
} // isConvertibleToThreeAddress = 1
} // Constraints = "$src = $dst"
} // Constraints = "$src = $dst"
// FIXME: Why do we need an explicit "Uses = [CL]" when the instr has a pattern
@ -333,6 +335,7 @@ def SAR64m1 : RI<0xD1, MRM7m, (outs), (ins i64mem:$dst),
// Rotate instructions
//===----------------------------------------------------------------------===//
let hasSideEffects = 0 in {
let Constraints = "$src1 = $dst" in {
def RCL8r1 : I<0xD0, MRM2r, (outs GR8:$dst), (ins GR8:$src1),
"rcl{b}\t$dst", [], IIC_SR>;
@ -455,6 +458,7 @@ def RCR32mCL : I<0xD3, MRM3m, (outs), (ins i32mem:$dst),
def RCR64mCL : RI<0xD3, MRM3m, (outs), (ins i64mem:$dst),
"rcr{q}\t{%cl, $dst|$dst, CL}", [], IIC_SR>;
}
} // hasSideEffects = 0
let Constraints = "$src1 = $dst" in {
// FIXME: provide shorter instructions when imm8 == 1