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Backed out changeset 6ca79677c286 (bug 1679922) for bustages on Spidermonkey. CLOSED TREE

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Butkovits Atila 2021-01-20 16:16:33 +02:00
parent e9da6df3eb
commit 5da94b141e
3 changed files with 0 additions and 45 deletions
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35
js/moz.configure
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@ -455,41 +455,6 @@ option(
set_define("JS_MASM_VERBOSE", depends_if("--enable-masm-verbose")(lambda _: True))
set_config("JS_MASM_VERBOSE", depends_if("--enable-masm-verbose")(lambda _: True))
# Architecture feature flags
# =======================================================
# Apple silicon does not seem to have any way to query the OS for the JSCVT
# flag stored in the ID_AA64ISAR1_EL1 system register. In the mean time, we
# hard code the value of the JSCVT flag which guards the implementation of
# FJCVTZS instruction as part of ARMv8.3-JSConv.
@depends(target)
def is_apple_silicon(target):
return target.os == "OSX" and target.kernel == "Darwin" and target.cpu == "aarch64"
option(
"--enable-arm64-fjcvtzs",
default=is_apple_silicon,
help="Whether the target is known to have Aarch64 FJCVTZS instruction.",
)
# The "ARM Architecture Reference Manual" for ARMv8 defines the JSCVT flag as
# being a 4 bit integer (D12.2.52) and it can be manipulated using >= operator
# (D12.1.4).
#
# The FJCVTZS instruction is implemented if ID_AA64ISAR1_EL1.JSCVT >= 1.
@depends("--enable-arm64-fjcvtzs", target, simulator)
def aarch64_jscvt(fjcvtzs, target, simulator):
if target.cpu == "aarch64" and fjcvtzs:
return 1
if simulator and simulator.arm64 and fjcvtzs:
return 1
return 0
set_define("MOZ_AARCH64_JSCVT", aarch64_jscvt)
# CTypes
# =======================================================

9
js/src/jit/arm64/vixl/Assembler-vixl.cpp
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@ -479,15 +479,6 @@ Assembler::Assembler(PositionIndependentCodeOption pic)
{
// Mozilla change: always use maximally-present features.
cpu_features_.Combine(CPUFeatures::InferFromOS());
// Mozilla change: Compile time hard-coded value from js-config.mozbuild.
#ifndef MOZ_AARCH64_JSCVT
# error "MOZ_AARCH64_JSCVT must be defined."
#elif MOZ_AARCH64_JSCVT >= 1
// Note, vixl backend implements the JSCVT flag as a boolean despite having 3
// extra bits reserved for forward compatibility in the ARMv8 documentation.
cpu_features_.Combine(CPUFeatures::kJSCVT);
#endif
}

1
js/src/jit/arm64/vixl/Cpu-vixl.cpp
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@ -203,7 +203,6 @@ CPUFeatures CPU::InferCPUFeaturesFromOS(
static const size_t kFeatureBitCount =
sizeof(kFeatureBits) / sizeof(kFeatureBits[0]);
// Mozilla change: Set the default for the simulator.
#ifdef JS_SIMULATOR_ARM64
unsigned long auxv = ~(0UL); // Enable all features for the Simulator.
#else