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[SystemZ] Support bare nop instructions 

Add support of "nop" and "nopr" (without operands) to assembler.

Review: Ulrich Weigand
This commit is contained in:
Jonas Paulsson 2020-09-24 17:24:29 +02:00
parent cdac4492b4
commit 9f5da55f5d
2 changed files with 10 additions and 2 deletions
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8
llvm/lib/Target/SystemZ/SystemZInstrInfo.td
View File

@ -101,10 +101,14 @@ let isBranch = 1, isTerminator = 1, isBarrier = 1 in {
}
}
// NOPs. These are again variants of the conditional branches,
// with the condition mask set to "never".
// NOPs. These are again variants of the conditional branches, with the
// condition mask set to "never". NOP_bare can't be an InstAlias since it
// would need R0D hard coded which is not part of ADDR64BitRegClass.
def NOP : InstAlias<"nop\t$XBD", (BCAsm 0, bdxaddr12only:$XBD), 0>;
let isAsmParserOnly = 1, hasNoSchedulingInfo = 1, M1 = 0, XBD2 = 0 in
def NOP_bare : InstRXb<0x47,(outs), (ins), "nop", []>;
def NOPR : InstAlias<"nopr\t$R", (BCRAsm 0, GR64:$R), 0>;
def NOPR_bare : InstAlias<"nopr", (BCRAsm 0, R0D), 0>;
// Fused compare-and-branch instructions.
//

4
llvm/test/MC/SystemZ/insn-good.s
View File

@ -12284,10 +12284,14 @@
niy 524287(%r15), 42
#CHECK: bc 0, 0 # encoding: [0x47,0x00,0x00,0x00]
#CHECK: nop # encoding: [0x47,0x00,0x00,0x00]
#CHECK: bcr 0, %r7 # encoding: [0x07,0x07]
#CHECK: bcr 0, %r0 # encoding: [0x07,0x00]
nop 0
nop
nopr %r7
nopr
#CHECK: nr %r0, %r0 # encoding: [0x14,0x00]
#CHECK: nr %r0, %r15 # encoding: [0x14,0x0f]