thumb2-branches.s
12.5 KB
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@ RUN: llvm-mc -triple=thumbv7-apple-darwin -mcpu=cortex-a8 -show-encoding < %s | FileCheck %s
@------------------------------------------------------------------------------
@ unconditional branches accept narrow suffix and encode to short encodings
@------------------------------------------------------------------------------
b.n #-2048
b.n #2046
@ CHECK: b #-2048 @ encoding: [0x00,0xe4]
@ CHECK: b #2046 @ encoding: [0xff,0xe3]
@------------------------------------------------------------------------------
@ unconditional branches accept wide suffix and encode to wide encodings
@------------------------------------------------------------------------------
b.w #-2048
b.w #2046
b.w #-1677216
b.w #1677214
@ CHECK: b.w #-2048 @ encoding: [0xff,0xf7,0x00,0xbc]
@ CHECK: b.w #2046 @ encoding: [0x00,0xf0,0xff,0xbb]
@ CHECK: b.w #-1677216 @ encoding: [0x66,0xf6,0x30,0xbc]
@ CHECK: b.w #1677214 @ encoding: [0x99,0xf1,0xcf,0xbb]
@------------------------------------------------------------------------------
@ unconditional branches without width suffix encode depending of offset size
@------------------------------------------------------------------------------
b #-2048
b #2046
b #-2050
b #2048
b #-1677216
b #1677214
@ CHECK: b #-2048 @ encoding: [0x00,0xe4]
@ CHECK: b #2046 @ encoding: [0xff,0xe3]
@ CHECK: b.w #-2050 @ encoding: [0xff,0xf7,0xff,0xbb]
@ CHECK: b.w #2048 @ encoding: [0x00,0xf0,0x00,0xbc]
@ CHECK: b.w #-1677216 @ encoding: [0x66,0xf6,0x30,0xbc]
@ CHECK: b.w #1677214 @ encoding: [0x99,0xf1,0xcf,0xbb]
@------------------------------------------------------------------------------
@ unconditional branches with width narrow suffix in IT block
@------------------------------------------------------------------------------
it eq
beq.n #-2048
it ne
bne.n #-2046
@ CHECK: it eq @ encoding: [0x08,0xbf]
@ CHECK: beq #-2048 @ encoding: [0x00,0xe4]
@ CHECK: it ne @ encoding: [0x18,0xbf]
@ CHECK: bne #-2046 @ encoding: [0x01,0xe4]
@------------------------------------------------------------------------------
@ unconditional branches with wide suffix in IT block
@------------------------------------------------------------------------------
it gt
bgt.w #-2048
it le
ble.w #2046
it ge
bge.w #-1677216
it lt
blt.w #1677214
@ CHECK: it gt @ encoding: [0xc8,0xbf]
@ CHECK: bgt.w #-2048 @ encoding: [0xff,0xf7,0x00,0xbc]
@ CHECK: it le @ encoding: [0xd8,0xbf]
@ CHECK: ble.w #2046 @ encoding: [0x00,0xf0,0xff,0xbb]
@ CHECK: it ge @ encoding: [0xa8,0xbf]
@ CHECK: bge.w #-1677216 @ encoding: [0x66,0xf6,0x30,0xbc]
@ CHECK: it lt @ encoding: [0xb8,0xbf]
@ CHECK: blt.w #1677214 @ encoding: [0x99,0xf1,0xcf,0xbb]
@------------------------------------------------------------------------------
@ conditional branches accept narrow suffix and encode to short encodings
@------------------------------------------------------------------------------
beq.n #-256
bne.n #254
@ CHECK: beq #-256 @ encoding: [0x80,0xd0]
@ CHECK: bne #254 @ encoding: [0x7f,0xd1]
@------------------------------------------------------------------------------
@ unconditional branches accept wide suffix and encode to wide encodings
@------------------------------------------------------------------------------
bmi.w #-256
bne.w #254
blt.w #-1048576
bge.w #1048574
@ CHECK: bmi.w #-256 @ encoding: [0x3f,0xf5,0x80,0xaf]
@ CHECK: bne.w #254 @ encoding: [0x40,0xf0,0x7f,0x80]
@ CHECK: blt.w #-1048576 @ encoding: [0xc0,0xf6,0x00,0x80]
@ CHECK: bge.w #1048574 @ encoding: [0xbf,0xf2,0xff,0xaf]
@------------------------------------------------------------------------------
@ unconditional branches without width suffix encode depending of offset size
@------------------------------------------------------------------------------
bne #-256
bgt #254
bne #-258
bgt #256
bne #-1048576
bgt #1048574
@ CHECK: bne #-256 @ encoding: [0x80,0xd1]
@ CHECK: bgt #254 @ encoding: [0x7f,0xdc]
@ CHECK: bne.w #-258 @ encoding: [0x7f,0xf4,0x7f,0xaf]
@ CHECK: bgt.w #256 @ encoding: [0x00,0xf3,0x80,0x80]
@ CHECK: bne.w #-1048576 @ encoding: [0x40,0xf4,0x00,0x80]
@ CHECK: bgt.w #1048574 @ encoding: [0x3f,0xf3,0xff,0xaf]
@------------------------------------------------------------------------------
@ same branch insturction encoding to conditional or unconditional depending
@ on whether it is in an IT block or not
@------------------------------------------------------------------------------
it eq
addeq r0, r1
bne #128
@ CHECK: it eq @ encoding: [0x08,0xbf]
@ CHECK: addeq r0, r1 @ encoding: [0x08,0x44]
@ CHECK: bne #128 @ encoding: [0x40,0xd1]
ite eq
addeq r0, r1
bne #128
@ CHECK: ite eq @ encoding: [0x0c,0xbf]
@ CHECK: addeq r0, r1 @ encoding: [0x08,0x44]
@ CHECK: bne #128 @ encoding: [0x40,0xe0]
@ RUN: llvm-mc -triple=thumbv7-apple-darwin -mcpu=cortex-a8 -show-encoding < %s | FileCheck %s
@------------------------------------------------------------------------------
@ unconditional branches accept narrow suffix and encode to short encodings
@------------------------------------------------------------------------------
b.n #-2048
b.n #2046
@ CHECK: b #-2048 @ encoding: [0x00,0xe4]
@ CHECK: b #2046 @ encoding: [0xff,0xe3]
@------------------------------------------------------------------------------
@ unconditional branches accept wide suffix and encode to wide encodings
@------------------------------------------------------------------------------
b.w #-2048
b.w #2046
b.w #-1677216
b.w #1677214
@ CHECK: b.w #-2048 @ encoding: [0xff,0xf7,0x00,0xbc]
@ CHECK: b.w #2046 @ encoding: [0x00,0xf0,0xff,0xbb]
@ CHECK: b.w #-1677216 @ encoding: [0x66,0xf6,0x30,0xbc]
@ CHECK: b.w #1677214 @ encoding: [0x99,0xf1,0xcf,0xbb]
@------------------------------------------------------------------------------
@ unconditional branches without width suffix encode depending of offset size
@------------------------------------------------------------------------------
b #-2048
b #2046
b #-2050
b #2048
b #-1677216
b #1677214
@ CHECK: b #-2048 @ encoding: [0x00,0xe4]
@ CHECK: b #2046 @ encoding: [0xff,0xe3]
@ CHECK: b.w #-2050 @ encoding: [0xff,0xf7,0xff,0xbb]
@ CHECK: b.w #2048 @ encoding: [0x00,0xf0,0x00,0xbc]
@ CHECK: b.w #-1677216 @ encoding: [0x66,0xf6,0x30,0xbc]
@ CHECK: b.w #1677214 @ encoding: [0x99,0xf1,0xcf,0xbb]
@------------------------------------------------------------------------------
@ unconditional branches with width narrow suffix in IT block
@------------------------------------------------------------------------------
it eq
beq.n #-2048
it ne
bne.n #-2046
@ CHECK: it eq @ encoding: [0x08,0xbf]
@ CHECK: beq #-2048 @ encoding: [0x00,0xe4]
@ CHECK: it ne @ encoding: [0x18,0xbf]
@ CHECK: bne #-2046 @ encoding: [0x01,0xe4]
@------------------------------------------------------------------------------
@ unconditional branches with wide suffix in IT block
@------------------------------------------------------------------------------
it gt
bgt.w #-2048
it le
ble.w #2046
it ge
bge.w #-1677216
it lt
blt.w #1677214
@ CHECK: it gt @ encoding: [0xc8,0xbf]
@ CHECK: bgt.w #-2048 @ encoding: [0xff,0xf7,0x00,0xbc]
@ CHECK: it le @ encoding: [0xd8,0xbf]
@ CHECK: ble.w #2046 @ encoding: [0x00,0xf0,0xff,0xbb]
@ CHECK: it ge @ encoding: [0xa8,0xbf]
@ CHECK: bge.w #-1677216 @ encoding: [0x66,0xf6,0x30,0xbc]
@ CHECK: it lt @ encoding: [0xb8,0xbf]
@ CHECK: blt.w #1677214 @ encoding: [0x99,0xf1,0xcf,0xbb]
@------------------------------------------------------------------------------
@ conditional branches accept narrow suffix and encode to short encodings
@------------------------------------------------------------------------------
beq.n #-256
bne.n #254
@ CHECK: beq #-256 @ encoding: [0x80,0xd0]
@ CHECK: bne #254 @ encoding: [0x7f,0xd1]
@------------------------------------------------------------------------------
@ unconditional branches accept wide suffix and encode to wide encodings
@------------------------------------------------------------------------------
bmi.w #-256
bne.w #254
blt.w #-1048576
bge.w #1048574
@ CHECK: bmi.w #-256 @ encoding: [0x3f,0xf5,0x80,0xaf]
@ CHECK: bne.w #254 @ encoding: [0x40,0xf0,0x7f,0x80]
@ CHECK: blt.w #-1048576 @ encoding: [0xc0,0xf6,0x00,0x80]
@ CHECK: bge.w #1048574 @ encoding: [0xbf,0xf2,0xff,0xaf]
@------------------------------------------------------------------------------
@ unconditional branches without width suffix encode depending of offset size
@------------------------------------------------------------------------------
bne #-256
bgt #254
bne #-258
bgt #256
bne #-1048576
bgt #1048574
@ CHECK: bne #-256 @ encoding: [0x80,0xd1]
@ CHECK: bgt #254 @ encoding: [0x7f,0xdc]
@ CHECK: bne.w #-258 @ encoding: [0x7f,0xf4,0x7f,0xaf]
@ CHECK: bgt.w #256 @ encoding: [0x00,0xf3,0x80,0x80]
@ CHECK: bne.w #-1048576 @ encoding: [0x40,0xf4,0x00,0x80]
@ CHECK: bgt.w #1048574 @ encoding: [0x3f,0xf3,0xff,0xaf]
@------------------------------------------------------------------------------
@ same branch insturction encoding to conditional or unconditional depending
@ on whether it is in an IT block or not
@------------------------------------------------------------------------------
it eq
addeq r0, r1
bne #128
@ CHECK: it eq @ encoding: [0x08,0xbf]
@ CHECK: addeq r0, r1 @ encoding: [0x08,0x44]
@ CHECK: bne #128 @ encoding: [0x40,0xd1]
ite eq
addeq r0, r1
bne #128
@ CHECK: ite eq @ encoding: [0x0c,0xbf]
@ CHECK: addeq r0, r1 @ encoding: [0x08,0x44]
@ CHECK: bne #128 @ encoding: [0x40,0xe0]
@------------------------------------------------------------------------------
@ Branch targets destined for ARM mode must == 0 (mod 4), otherwise (mod 2).
@------------------------------------------------------------------------------
b #2
bl #2
beq #2
cbz r0, #2
@ N.b. destination is "align(PC, 4) + imm" so imm is still 4-byte
@ aligned even though current PC may not and destination must be.
blx #4
@ CHECK: b #2 @ encoding: [0x01,0xe0]
@ CHECK: bl #2 @ encoding: [0x00,0xf0,0x01,0xf8]
@ CHECK: beq #2 @ encoding: [0x01,0xd0]
@ CHECK: cbz r0, #2 @ encoding: [0x08,0xb1]
@ CHECK: blx #4 @ encoding: [0x00,0xf0,0x02,0xe8]