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| author | Jack Carter <jack.carter@imgtec.com> | 2013-04-25 23:31:35 +0000 |
|---|---|---|
| committer | Jack Carter <jack.carter@imgtec.com> | 2013-04-25 23:31:35 +0000 |
| commit | 97265a48895a2cda7f04e47bfe935c4fdd71f8ae (patch) | |
| tree | 10ee6dbec49767b76962179da183607488d8f85e /test/MC/Mips/mips_directives.s | |
| parent | 0fc7137f2f8a99cb749024c51e3247f4b24e1ee0 (diff) | |
| download | external_llvm-97265a48895a2cda7f04e47bfe935c4fdd71f8ae.zip external_llvm-97265a48895a2cda7f04e47bfe935c4fdd71f8ae.tar.gz external_llvm-97265a48895a2cda7f04e47bfe935c4fdd71f8ae.tar.bz2 | |
Mips assembler: .set reorder support
Mips have delayslots for certain instructions
like jumps and branches. These are instructions
that follow the branch or jump and are executed
before the jump or branch is completed.
Early Mips compilers could not cope with delayslots
and left them up to the assembler. The assembler would
fill the delayslots with the appropriate instruction,
usually just a nop to allow correct runtime behavior.
The default behavior for this is set with .set reorder.
To tell the assembler that you don't want it to mess with
the delayslot one used .set noreorder.
For backwards compatibility we need to support
.set reorder and have it be the default behavior in the
assembler.
Our support for it is to insert a NOP directly after an
instruction with a delayslot when in .set reorder mode.
Contributer: Vladimir Medic
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180584 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/MC/Mips/mips_directives.s')
| -rw-r--r-- | test/MC/Mips/mips_directives.s | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/test/MC/Mips/mips_directives.s b/test/MC/Mips/mips_directives.s index df7e645..45247cd 100644 --- a/test/MC/Mips/mips_directives.s +++ b/test/MC/Mips/mips_directives.s @@ -1,11 +1,20 @@ # RUN: llvm-mc -show-encoding -triple mips-unknown-unknown %s | FileCheck %s # +# CHECK: .text +# CHECK: $BB0_2: $BB0_2: .ent directives_test .frame $sp,0,$ra .mask 0x00000000,0 .fmask 0x00000000,0 +# CHECK: b 1332 # encoding: [0x10,0x00,0x01,0x4d] +# CHECK: j 1328 # encoding: [0x08,0x00,0x01,0x4c] +# CHECK: jal 1328 # encoding: [0x0c,0x00,0x01,0x4c] + .set noreorder + b 1332 + j 1328 + jal 1328 .set nomacro .set noat $JTI0_0: @@ -15,7 +24,16 @@ $JTI0_0: # CHECK-NEXT: .4byte 2013265916 .set at=$12 .set macro +# CHECK: b 1332 # encoding: [0x10,0x00,0x01,0x4d] +# CHECK: nop # encoding: [0x00,0x00,0x00,0x00] +# CHECK: j 1328 # encoding: [0x08,0x00,0x01,0x4c] +# CHECK: nop # encoding: [0x00,0x00,0x00,0x00] +# CHECK: jal 1328 # encoding: [0x0c,0x00,0x01,0x4c] +# CHECK: nop # encoding: [0x00,0x00,0x00,0x00] .set reorder + b 1332 + j 1328 + jal 1328 .set at=$a0 .set STORE_MASK,$t7 .set FPU_MASK,$f7 |