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| author | Cherry Zhang <cherryyz@google.com> | 2018-02-09 12:47:33 -0500 |
|---|---|---|
| committer | Cherry Zhang <cherryyz@google.com> | 2018-02-14 17:09:15 +0000 |
| commit | 5a43a271e8cc589e077b4e056298d3711e233cd3 (patch) | |
| tree | 733564dad60c29db850dc96691836da21fad14f4 /src/runtime/vlop_arm.s | |
| parent | 633b38c5d2bd66e0a4688d80f13ccd3c0837948d (diff) | |
| download | go-5a43a271e8cc589e077b4e056298d3711e233cd3.tar.gz go-5a43a271e8cc589e077b4e056298d3711e233cd3.zip | |
cmd/compile: CALLudiv on nacl/arm doesn't clobber R12
On nacl/arm, R12 is clobbered by the RET instruction in function
that has a frame. runtime.udiv doesn't have a frame, so it does
not clobber R12.
Change-Id: I0de448749f615908f6659e92d201ba3eb2f8266d
Reviewed-on: https://go-review.googlesource.com/93116
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Diffstat (limited to 'src/runtime/vlop_arm.s')
| -rw-r--r-- | src/runtime/vlop_arm.s | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/runtime/vlop_arm.s b/src/runtime/vlop_arm.s index e7e8ed2e05..52143b86e7 100644 --- a/src/runtime/vlop_arm.s +++ b/src/runtime/vlop_arm.s @@ -102,6 +102,9 @@ TEXT runtime·_sfloatpanic(SB),NOSPLIT|NOFRAME,$0 #define Ra R11 // Be careful: Ra == R11 will be used by the linker for synthesized instructions. +// Note: this function does not have a frame. If it ever needs a frame, +// the RET instruction will clobber R12 on nacl, and the compiler's register +// allocator needs to know. TEXT runtime·udiv(SB),NOSPLIT|NOFRAME,$0 MOVBU runtime·hardDiv(SB), Ra CMP $0, Ra |