derek.holloway
7502bf64a4
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67 lines
1.3 KiB
ArmAsm
67 lines
1.3 KiB
ArmAsm
@ RUN: llvm-mc -triple thumbv7m -filetype=obj -o %t %s
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@ RUN: llvm-objdump -d --no-show-raw-insn --triple=thumbv7m %t | FileCheck %s
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@ The three "b external" instructions relax from 2-byte tB to 4-byte t2B
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@ (unresolved fixup). During the fused relaxation+layout pass, the cumulative
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@ Stretch must not cause the tLDRpci instructions to appear misaligned and
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@ spuriously relax to 4-byte t2LDRpci. The .p2align 2 before the constant pool
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@ absorbs the upstream growth, keeping the targets 4-byte aligned.
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@
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@ If tLDRpci spuriously widens, the extra bytes push the cbz target past the
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@ 126-byte range, causing "out of range pc-relative fixup value".
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@ CHECK-LABEL: <fn>:
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@ CHECK: 0: cbz r0, 0x7e
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@ CHECK: 4c: ldr r2, [pc, #0x30]
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@ CHECK-NOT: ldr.w
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@ CHECK: 5e: ldr r2, [pc, #0x24]
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@ CHECK-NOT: ldr.w
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@ CHECK: 70: ldr r2, [pc, #0x14]
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@ CHECK-NOT: ldr.w
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@ CHECK: 7e: nop
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.syntax unified
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.text
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.globl fn
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.type fn,%function
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.thumb_func
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fn:
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cbz r0, .LBB0_11
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.rept 6
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nop
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.endr
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b .LBB0_11
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.rept 6
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nop
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.endr
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b external
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.rept 14
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nop
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.endr
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b .LBB0_11
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.rept 7
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nop
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.endr
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ldr.n r2, .LCPI0_3
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.rept 6
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nop
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.endr
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b external
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ldr r2, .LCPI0_4
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.rept 6
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nop
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.endr
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b external
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ldr.n r2, .LCPI0_5
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.rept 6
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nop
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.endr
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.LBB0_11:
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.p2align 2
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.LCPI0_3:
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.long 4
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.LCPI0_4:
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.long 5
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.LCPI0_5:
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.long 6
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