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Mips specific llvm assembler support for branch and jump instructions.

Browse Source 
Test case included.

Contributer: Vladimir Medic


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163277 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jack Carter 2012-09-06 00:43:26 +00:00
parent 30eac71f3b
commit ad51a4a598
2 changed files with 73 additions and 2 deletions
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11
lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
View File

@ -143,7 +143,11 @@ getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups) const {
const MCOperand &MO = MI.getOperand(OpNo);
assert(MO.isExpr() && "getBranchTargetOpValue expects only expressions");
// If the destination is an immediate, we have nothing to do.
if (MO.isImm()) return MO.getImm();
assert(MO.isExpr() &&
"getBranchTargetOpValue expects only expressions or immediates");
const MCExpr *Expr = MO.getExpr();
Fixups.push_back(MCFixup::Create(0, Expr,
@ -159,7 +163,10 @@ getJumpTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups) const {
const MCOperand &MO = MI.getOperand(OpNo);
assert(MO.isExpr() && "getJumpTargetOpValue expects only expressions");
// If the destination is an immediate, we have nothing to do.
if (MO.isImm()) return MO.getImm();
assert(MO.isExpr() &&
"getJumpTargetOpValue expects only expressions or an immediate");
const MCExpr *Expr = MO.getExpr();
Fixups.push_back(MCFixup::Create(0, Expr,

64
test/MC/Mips/mips-jump-instructions.s Normal file
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@ -0,0 +1,64 @@
# RUN: llvm-mc %s -triple=mipsel-unknown-linux -show-encoding -mcpu=mips32r2 | FileCheck %s
# Check that the assembler can handle the documented syntax
# for jumps and branches.
# CHECK: .section __TEXT,__text,regular,pure_instructions
#------------------------------------------------------------------------------
# Branch instructions
#------------------------------------------------------------------------------
# CHECK: b 1332 # encoding: [0x34,0x05,0x00,0x10]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK: bc1f 1332 # encoding: [0x34,0x05,0x00,0x45]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK: bc1t 1332 # encoding: [0x34,0x05,0x01,0x45]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK: beq $9, $6, 1332 # encoding: [0x34,0x05,0x26,0x11]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK: bgez $6, 1332 # encoding: [0x34,0x05,0xc1,0x04]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK: bgezal $6, 1332 # encoding: [0x34,0x05,0xd1,0x04]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK: bgtz $6, 1332 # encoding: [0x34,0x05,0xc0,0x1c]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK: blez $6, 1332 # encoding: [0x34,0x05,0xc0,0x18]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK: bne $9, $6, 1332 # encoding: [0x34,0x05,0x26,0x15]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
b 1332
nop
bc1f 1332
nop
bc1t 1332
nop
beq $9,$6,1332
nop
bgez $6,1332
nop
bgezal $6,1332
nop
bgtz $6,1332
nop
blez $6,1332
nop
bne $9,$6,1332
nop
end_of_code:
#------------------------------------------------------------------------------
# Jump instructions
#------------------------------------------------------------------------------
# CHECK: j 1328 # encoding: [0x30,0x05,0x00,0x08]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK: jal 1328 # encoding: [0x30,0x05,0x00,0x0c]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK: jalr $6 # encoding: [0x09,0xf8,0xc0,0x00]
# CHECK: nop # encoding: [0x00,0x00,0x00,0x00]
# CHECK: jr $7 # encoding: [0x08,0x00,0xe0,0x00]
j 1328
nop
jal 1328
nop
jalr $6
nop
jr $7