Summary:
Given that we had a bug on max/minUIntN(64), these should have tests
too.
Reviewers: rnk
Subscribers: dylanmckay, llvm-commits
Differential Revision: https://reviews.llvm.org/D22443
llvm-svn: 275723
Summary:
Previously we were doing 1 << S. "1" is an int, so this doesn't work
when S >= 32.
This patch also adds some static_asserts to these functions to ensure
that we don't hit UB by shifting left too much.
Reviewers: rnk
Subscribers: llvm-commits, dylanmckay
Differential Revision: https://reviews.llvm.org/D22441
llvm-svn: 275719
Summary:
This shift is undefined behavior (and, as compiled by clang, gives the
wrong answer for maxUIntN(64)).
Reviewers: mkuper
Subscribers: llvm-commits, jroelofs, rsmith
Differential Revision: https://reviews.llvm.org/D22430
llvm-svn: 275656
Summary: Add SaturatingMultiplyAdd convenience function template since A + (X * Y) comes up frequently when doing weighted arithmetic.
Reviewers: davidxl, silvas
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D15385
llvm-svn: 257532
Summary:
Improve SaturatingAdd()/SaturatingMultiply() to use bool * to optionally return overflow result.
This should make it clearer that the value is returned at callsites and reduces the size of the implementation.
Reviewers: davidxl, silvas
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D15219
llvm-svn: 255128
Summary: Adds the ability for callers to detect when saturation occurred on the result of saturating addition/multiplication.
Reviewers: davidxl, silvas, rsmith
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D14931
llvm-svn: 253921
Summary:
This change fixes the SaturatingMultiply<T>() function template to not cause undefined behavior with T=uint16_t.
Thanks to Richard Smith's contribution, it also no longer requires an integer division.
Patch by Richard Smith.
Reviewers: silvas, davidxl
Subscribers: rsmith, davidxl, llvm-commits
Differential Revision: http://reviews.llvm.org/D14845
llvm-svn: 253870
It caused link errors of the form:
InstrProfiling.c:(.text.__llvm_profile_instrument_target+0x1c0): undefined reference to `__sync_fetch_and_add_8'
We had a network outage at the time of the commit so the first build to show a
problem is http://lab.llvm.org:8011/builders/clang-cmake-mips/builds/10827
llvm-svn: 253656
Ubsan detected undefined behavior in the MathExtras SaturatingMultiply test.
This change disables the test while it is being investigated.
llvm-svn: 253539
Summary:
This change adds MathExtras helper functions for handling unsigned, saturating addition and multiplication. It also updates the instrumentation and sample profile merge implementations to use them.
Reviewers: dnovillo, bogner, davidxl
Subscribers: davidxl, llvm-commits
Differential Revision: http://reviews.llvm.org/D14720
llvm-svn: 253497
Summary:
This change adds MathExtras helper functions for handling unsigned, saturating addition and multiplication. It also updates the instrumentation and sample profile merge implementations to use them.
No functional changes.
Reviewers: dnovillo, bogner, davidxl
Subscribers: davidxl, llvm-commits
Differential Revision: http://reviews.llvm.org/D14720
llvm-svn: 253412
HHVM calling convention, hhvmcc, is used by HHVM JIT for
functions in translated cache. We currently support LLVM back end to
generate code for X86-64 and may support other architectures in the
future.
In HHVM calling convention any GP register could be used to pass and
return values, with the exception of R12 which is reserved for
thread-local area and is callee-saved. Other than R12, we always
pass RBX and RBP as args, which are our virtual machine's stack pointer
and frame pointer respectively.
When we enter translation cache via hhvmcc function, we expect
the stack to be aligned at 16 bytes, i.e. skewed by 8 bytes as opposed
to standard ABI alignment. This affects stack object alignment and stack
adjustments for function calls.
One extra calling convention, hhvm_ccc, is used to call C++ helpers from
HHVM's translation cache. It is almost identical to standard C calling
convention with an exception of first argument which is passed in RBP
(before we use RDI, RSI, etc.)
Differential Revision: http://reviews.llvm.org/D12681
llvm-svn: 248832
Justin Lebar