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Most PPC M[TF]CR instructions do not have side effects 

llvm-svn: 178978
This commit is contained in:
Hal Finkel 2013-04-07 14:33:13 +00:00
parent 7be6ead7a4
commit b47a69acde
2 changed files with 19 additions and 5 deletions
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9
llvm/lib/Target/PowerPC/PPCInstr64Bit.td
View File

@ -224,6 +224,7 @@ def : Pat<(PPCtc_return CTRRC8:$dst, imm:$imm),
// 64-bit CR instructions
let neverHasSideEffects = 1 in {
def MTCRF8 : XFXForm_5<31, 144, (outs crbitm:$FXM), (ins G8RC:$rS),
"mtcrf $FXM, $rS", BrMCRX>,
PPC970_MicroCode, PPC970_Unit_CRU;
@ -232,7 +233,13 @@ let isCodeGenOnly = 1 in
def MFCR8pseud: XFXForm_3<31, 19, (outs G8RC:$rT), (ins crbitm:$FXM),
"#MFCR8pseud", SprMFCR>,
PPC970_MicroCode, PPC970_Unit_CRU;
} // neverHasSideEffects = 1
// MFCR uses all CR registers, but marking that explicitly causes
// problems because some of them appear to be undefined. Because
// this form is used only in prologue code, just mark it as having
// side effects.
let /* Uses = [CR0, CR1, CR2, CR3, CR4, CR5, CR6] */ hasSideEffects = 1 in
def MFCR8 : XFXForm_3<31, 19, (outs G8RC:$rT), (ins),
"mfcr $rT", SprMFCR>,
PPC970_MicroCode, PPC970_Unit_CRU;

15
llvm/lib/Target/PowerPC/PPCInstrInfo.td
View File

@ -1337,6 +1337,7 @@ let mayLoad = 1 in
def RESTORE_VRSAVE : Pseudo<(outs VRSAVERC:$vrsave), (ins memri:$F),
"#RESTORE_VRSAVE", []>;
let neverHasSideEffects = 1 in {
def MTCRF : XFXForm_5<31, 144, (outs crbitm:$FXM), (ins GPRC:$rS),
"mtcrf $FXM, $rS", BrMCRX>,
PPC970_MicroCode, PPC970_Unit_CRU;
@ -1355,14 +1356,20 @@ let isCodeGenOnly = 1 in
def MFCRpseud: XFXForm_3<31, 19, (outs GPRC:$rT), (ins crbitm:$FXM),
"#MFCRpseud", SprMFCR>,
PPC970_MicroCode, PPC970_Unit_CRU;
def MFCR : XFXForm_3<31, 19, (outs GPRC:$rT), (ins),
"mfcr $rT", SprMFCR>,
PPC970_MicroCode, PPC970_Unit_CRU;
def MFOCRF: XFXForm_5a<31, 19, (outs GPRC:$rT), (ins crbitm:$FXM),
"mfocrf $rT, $FXM", SprMFCR>,
PPC970_DGroup_First, PPC970_Unit_CRU;
} // neverHasSideEffects = 1
// MFCR uses all CR registers, but marking that explicitly causes
// problems because some of them appear to be undefined. Because
// this form is used only in prologue code, just mark it as having
// side effects.
let /* Uses = [CR0, CR1, CR2, CR3, CR4, CR5, CR6] */ hasSideEffects = 1 in
def MFCR : XFXForm_3<31, 19, (outs GPRC:$rT), (ins),
"mfcr $rT", SprMFCR>,
PPC970_MicroCode, PPC970_Unit_CRU;
// Pseudo instruction to perform FADD in round-to-zero mode.
let usesCustomInserter = 1, Uses = [RM] in {