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[liftoff][arm] Make context register allocatable

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This will make it easier to generate builtin calls that require the
context to be passed in that register, because this can be represented
as a {LiftoffRegister} then.

R=thibaudm@chromium.org

Bug: v8:11453
Change-Id: I00995203cc936f23d1c01fdbf8f13eb929f228ae
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2752151
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73345}
This commit is contained in:
Clemens Backes 2021-03-11 12:55:30 +01:00 committed by Commit Bot
parent 80f5dfda01
commit 4b3371c62b
2 changed files with 4 additions and 4 deletions
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4
src/execution/arm/frame-constants-arm.h
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@ -76,8 +76,8 @@ class WasmCompileLazyFrameConstants : public TypedFrameConstants {
// registers (see liftoff-assembler-defs.h).
class WasmDebugBreakFrameConstants : public TypedFrameConstants {
public:
// {r0, r1, r2, r3, r4, r5, r6, r8, r9}
static constexpr uint32_t kPushedGpRegs = 0b1101111111;
// {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9}
static constexpr uint32_t kPushedGpRegs = 0b1111111111;
// {d0 .. d12}
static constexpr int kFirstPushedFpReg = 0;
static constexpr int kLastPushedFpReg = 12;

4
src/wasm/baseline/liftoff-assembler-defs.h
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@ -48,9 +48,9 @@ constexpr RegList kLiftoffAssemblerFpCacheRegs = DoubleRegister::ListOf(
#elif V8_TARGET_ARCH_ARM
// r7: cp, r10: root, r11: fp, r12: ip, r13: sp, r14: lr, r15: pc.
// r10: root, r11: fp, r12: ip, r13: sp, r14: lr, r15: pc.
constexpr RegList kLiftoffAssemblerGpCacheRegs =
Register::ListOf(r0, r1, r2, r3, r4, r5, r6, r8, r9);
Register::ListOf(r0, r1, r2, r3, r4, r5, r6, r7, r8, r9);
// d13: zero, d14-d15: scratch
constexpr RegList kLiftoffAssemblerFpCacheRegs = LowDwVfpRegister::ListOf(