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Add MC encodings for some Thumb instructions. Test for a few of them. The "bx

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lr" instruction cannot be tested just yet. It requires matching a "condition
code", but adding one of those makes things go south quickly...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119774 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2010-11-19 01:33:10 +00:00
parent 737d2816c4
commit 602890dd8e
2 changed files with 56 additions and 17 deletions
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65
lib/Target/ARM/ARMInstrThumb.td
View File

@ -190,7 +190,10 @@ def tSETENDLE : T1I<(outs), (ins), NoItinerary, "setend\tle",
def tBKPT : T1I<(outs), (ins i32imm:$val), NoItinerary, "bkpt\t$val",
[/* For disassembly only; pattern left blank */]>,
T1Encoding<0b101111> {
bits<8> val;
let Inst{9-8} = 0b10;
let Inst{7-0} = val;
}
// Change Processor State is a system instruction -- for disassembly only.
@ -259,32 +262,48 @@ def tADDspr : TIt<(outs GPR:$dst), (ins GPR:$lhs, GPR:$rhs), IIC_iALUr,
//
let isReturn = 1, isTerminator = 1, isBarrier = 1 in {
def tBX_RET : TI<(outs), (ins), IIC_Br, "bx\tlr", [(ARMretflag)]>,
def tBX_RET : TI<(outs), (ins), IIC_Br, "bx\tlr",
[(ARMretflag)]>,
T1Special<{1,1,0,?}> { // A6.2.3 & A8.6.25
let Inst{6-3} = 0b1110; // Rm = lr
let Inst{2-0} = 0b000;
}
// Alternative return instruction used by vararg functions.
def tBX_RET_vararg : TI<(outs), (ins tGPR:$target), IIC_Br, "bx\t$target",[]>,
T1Special<{1,1,0,?}>; // A6.2.3 & A8.6.25
def tBX_RET_vararg : TI<(outs), (ins tGPR:$Rm),
IIC_Br, "bx\t$Rm",
[]>,
T1Special<{1,1,0,?}> { // A6.2.3 & A8.6.25
bits<4> Rm;
let Inst{6-3} = Rm;
let Inst{2-0} = 0b000;
}
}
// Indirect branches
let isBranch = 1, isTerminator = 1, isBarrier = 1, isIndirectBranch = 1 in {
def tBRIND : TI<(outs), (ins GPR:$dst), IIC_Br, "mov\tpc, $dst",
[(brind GPR:$dst)]>,
def tBRIND : TI<(outs), (ins GPR:$Rm), IIC_Br, "mov\tpc, $Rm",
[(brind GPR:$Rm)]>,
T1Special<{1,0,1,?}> {
// <Rd> = Inst{7:2-0} = pc
let Inst{2-0} = 0b111;
bits<4> Rm;
let Inst{6-3} = Rm;
let Inst{2-0} = 0b111; // <Rd> = Inst{7:2-0} = pc
}
}
// FIXME: remove when we have a way to marking a MI with these properties.
let isReturn = 1, isTerminator = 1, isBarrier = 1, mayLoad = 1,
hasExtraDefRegAllocReq = 1 in
def tPOP_RET : T1I<(outs), (ins pred:$p, reglist:$dsts, variable_ops),
def tPOP_RET : T1I<(outs), (ins pred:$p, reglist:$regs, variable_ops),
IIC_iPop_Br,
"pop${p}\t$dsts", []>,
T1Misc<{1,1,0,?,?,?,?}>;
"pop${p}\t$regs", []>,
T1Misc<{1,1,0,?,?,?,?}> {
bits<16> regs;
let Inst{8} = regs{15};
let Inst{7-0} = regs{7-0};
}
let isCall = 1,
Defs = [R0, R1, R2, R3, R12, LR,
@ -563,10 +582,15 @@ defm tSTM : thumb_ldst_mult<"stm", IIC_iStore_m, IIC_iStore_mu,
} // neverHasSideEffects
let mayLoad = 1, Uses = [SP], Defs = [SP], hasExtraDefRegAllocReq = 1 in
def tPOP : T1I<(outs), (ins pred:$p, reglist:$dsts, variable_ops),
def tPOP : T1I<(outs), (ins pred:$p, reglist:$regs, variable_ops),
IIC_iPop,
"pop${p}\t$dsts", []>,
T1Misc<{1,1,0,?,?,?,?}>;
"pop${p}\t$regs", []>,
T1Misc<{1,1,0,?,?,?,?}> {
bits<16> regs;
let Inst{8} = regs{15};
let Inst{7-0} = regs{7-0};
}
let mayStore = 1, Uses = [SP], Defs = [SP], hasExtraSrcRegAllocReq = 1 in
def tPUSH : T1I<(outs), (ins pred:$p, reglist:$srcs, variable_ops),
@ -661,10 +685,17 @@ def tCMPzi8 : T1pI<(outs), (ins tGPR:$lhs, i32imm:$rhs), IIC_iCMPi,
// CMP register
let isCompare = 1, Defs = [CPSR] in {
def tCMPr : T1pI<(outs), (ins tGPR:$lhs, tGPR:$rhs), IIC_iCMPr,
"cmp", "\t$lhs, $rhs",
[(ARMcmp tGPR:$lhs, tGPR:$rhs)]>,
T1DataProcessing<0b1010>;
def tCMPr : T1pI<(outs), (ins tGPR:$Rn, tGPR:$Rm), IIC_iCMPr,
"cmp", "\t$Rn, $Rm",
[(ARMcmp tGPR:$Rn, tGPR:$Rm)]>,
T1DataProcessing<0b1010> {
bits<3> Rm;
bits<3> Rn;
let Inst{5-3} = Rm;
let Inst{2-0} = Rn;
}
def tCMPzr : T1pI<(outs), (ins tGPR:$lhs, tGPR:$rhs), IIC_iCMPr,
"cmp", "\t$lhs, $rhs",
[(ARMcmpZ tGPR:$lhs, tGPR:$rhs)]>,

8
test/MC/ARM/thumb.s Normal file
View File

@ -0,0 +1,8 @@
@ RUN: llvm-mc -triple thumb-apple-darwin -show-encoding < %s | FileCheck %s
.code 16
@ CHECK: cmp r1, r2 @ encoding: [0x91,0x42]
cmp r1, r2
@ CHECK: pop {r1, r2, r4} @ encoding: [0x16,0xbc]
pop {r1, r2, r4}