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[Thumb2] LDRS?[BH] cannot load to the PC

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The Thumb2 LDRS?[BH] instructions are not valid when the destination
register is the PC (these encodings are used for preload hints).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220278 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Oliver Stannard 2014-10-21 09:14:15 +00:00
parent 9156c5e3ba
commit d75e7ad0c8
2 changed files with 55 additions and 4 deletions
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8
lib/Target/ARM/ARMInstrThumb2.td
View File

@ -1262,15 +1262,15 @@ defm t2LDR : T2I_ld<0, 0b10, "ldr", IIC_iLoad_i, IIC_iLoad_si, GPR,
// Loads with zero extension
defm t2LDRH : T2I_ld<0, 0b01, "ldrh", IIC_iLoad_bh_i, IIC_iLoad_bh_si,
GPR, UnOpFrag<(zextloadi16 node:$Src)>>;
GPRnopc, UnOpFrag<(zextloadi16 node:$Src)>>;
defm t2LDRB : T2I_ld<0, 0b00, "ldrb", IIC_iLoad_bh_i, IIC_iLoad_bh_si,
GPR, UnOpFrag<(zextloadi8 node:$Src)>>;
GPRnopc, UnOpFrag<(zextloadi8 node:$Src)>>;
// Loads with sign extension
defm t2LDRSH : T2I_ld<1, 0b01, "ldrsh", IIC_iLoad_bh_i, IIC_iLoad_bh_si,
GPR, UnOpFrag<(sextloadi16 node:$Src)>>;
GPRnopc, UnOpFrag<(sextloadi16 node:$Src)>>;
defm t2LDRSB : T2I_ld<1, 0b00, "ldrsb", IIC_iLoad_bh_i, IIC_iLoad_bh_si,
GPR, UnOpFrag<(sextloadi8 node:$Src)>>;
GPRnopc, UnOpFrag<(sextloadi8 node:$Src)>>;
let mayLoad = 1, neverHasSideEffects = 1, hasExtraDefRegAllocReq = 1 in {
// Load doubleword

51
test/MC/ARM/thumb2-ldrb-ldrh.s Normal file
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@ -0,0 +1,51 @@
@ RUN: not llvm-mc -triple thumbv7a-none-eabi -show-encoding < %s 2>&1 | FileCheck %s --check-prefix=CHECK
@ RUN: not llvm-mc -triple thumbv7m-none-eabi -show-encoding < %s 2>&1 | FileCheck %s --check-prefix=CHECK
@ Thumb2 LDRS?[BH] are not valid when Rt == PC (these encodings are used for
@ preload hints).
@ We don't check the actual error messages here as they are currently not very
@ helpful, see http://llvm.org/bugs/show_bug.cgi?id=21066.
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
ldrb pc, [r0, #10]
ldrb.w pc, [r1, #10]
ldrb pc, [r2, #-5]
ldrb pc, [pc, #7]
ldrb.w pc, [pc, #7]
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
ldrsb pc, [r3, #10]
ldrsb.w pc, [r4, #10]
ldrsb pc, [r5, #-5]
ldrsb pc, [pc, #7]
ldrsb.w pc, [pc, #7]
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
ldrh pc, [r6, #10]
ldrh.w pc, [r7, #10]
ldrh pc, [r8, #-5]
ldrh pc, [pc, #7]
ldrh.w pc, [pc, #7]
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
@ CHECK: error:
ldrsh pc, [r9, #10]
ldrsh.w pc, [r10, #10]
ldrsh pc, [r11, #-5]
ldrsh pc, [pc, #7]
ldrsh.w pc, [pc, #7]