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This patch adds support for FPINST/FPINST2 as operands to vmsr/vmrs. These are optional registers that may be supported some ARM implementations to aid with resolution of floating point exceptions. The manual pages for vmsr and vmrs do not detail their use. Encodings and other information can be found in ARM Architecture Reference Manual section F, chapter 6, paragraph 3. 

llvm-svn: 183733
This commit is contained in:
Mihai Popa 2013-06-11 09:39:51 +00:00
parent bc1c6714f2
commit 1c7be576c5
4 changed files with 33 additions and 6 deletions
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9
llvm/lib/Target/ARM/ARMInstrVFP.td
View File

@ -1331,6 +1331,10 @@ let Uses = [FPSCR] in {
"vmrs", "\t$Rt, mvfr0", []>;
def VMRS_MVFR1 : MovFromVFP<0b0110 /* mvfr1 */, (outs GPR:$Rt), (ins),
"vmrs", "\t$Rt, mvfr1", []>;
def VMRS_FPINST : MovFromVFP<0b1001 /* fpinst */, (outs GPR:$Rt), (ins),
"vmrs", "\t$Rt, fpinst", []>;
def VMRS_FPINST2 : MovFromVFP<0b1010 /* fpinst2 */, (outs GPR:$Rt), (ins),
"vmrs", "\t$Rt, fpinst2", []>;
}
//===----------------------------------------------------------------------===//
@ -1364,6 +1368,11 @@ let Defs = [FPSCR] in {
// System level GPR -> FPSID
def VMSR_FPSID : MovToVFP<0b0000 /* fpsid */, (outs), (ins GPR:$src),
"vmsr", "\tfpsid, $src", []>;
def VMSR_FPINST : MovToVFP<0b1001 /* fpinst */, (outs), (ins GPR:$src),
"vmsr", "\tfpinst, $src", []>;
def VMSR_FPINST2 : MovToVFP<0b1010 /* fpinst2 */, (outs), (ins GPR:$src),
"vmsr", "\tfpinst2, $src", []>;
}
//===----------------------------------------------------------------------===//

2
llvm/lib/Target/ARM/ARMRegisterInfo.td
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@ -175,6 +175,8 @@ def FPSID : ARMReg<0, "fpsid">;
def MVFR1 : ARMReg<6, "mvfr1">;
def MVFR0 : ARMReg<7, "mvfr0">;
def FPEXC : ARMReg<8, "fpexc">;
def FPINST : ARMReg<9, "fpinst">;
def FPINST2 : ARMReg<10, "fpinst2">;
// Register classes.
//

8
llvm/test/MC/ARM/simple-fp-encoding.s
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@ -157,6 +157,10 @@
vmrs r0, fpexc
@ CHECK: vmrs r0, fpsid @ encoding: [0x10,0x0a,0xf0,0xee]
vmrs r0, fpsid
@ CHECK: vmrs r1, fpinst @ encoding: [0x10,0x1a,0xf9,0xee]
vmrs r1, fpinst
@ CHECK: vmrs r8, fpinst2 @ encoding: [0x10,0x8a,0xfa,0xee]
vmrs r8, fpinst2
@ CHECK: vmsr fpscr, r0 @ encoding: [0x10,0x0a,0xe1,0xee]
vmsr fpscr, r0
@ -164,6 +168,10 @@
vmsr fpexc, r0
@ CHECK: vmsr fpsid, r0 @ encoding: [0x10,0x0a,0xe0,0xee]
vmsr fpsid, r0
@ CHECK: vmsr fpinst, r3 @ encoding: [0x10,0x3a,0xe9,0xee]
vmsr fpinst, r3
@ CHECK: vmsr fpinst2, r4 @ encoding: [0x10,0x4a,0xea,0xee]
vmsr fpinst2, r4
vmov.f64 d16, #3.000000e+00
vmov.f32 s0, #3.000000e+00

8
llvm/test/MC/Disassembler/ARM/fp-encoding.txt
View File

@ -122,6 +122,10 @@
# CHECK: vmrs r0, fpexc
0x10 0x0a 0xf0 0xee
# CHECK: vmrs r0, fpsid
0x10 0x1a 0xf9 0xee
# CHECK: vmrs r1, fpinst
0x10 0x8a 0xfa 0xee
# CHECK: vmrs r8, fpinst2
0x10 0x0a 0xe1 0xee
# CHECK: vmsr fpscr, r0
@ -129,6 +133,10 @@
# CHECK: vmsr fpexc, r0
0x10 0x0a 0xe0 0xee
# CHECK: vmsr fpsid, r0
0x10 0x3a 0xe9 0xee
# CHECK: vmsr fpinst, r3
0x10 0x4a 0xea 0xee
# CHECK: vmsr fpinst2, r4
0x10 0x0a 0x00 0xee
0x90 0x1a 0x00 0xee