Commit Graph

11 Commits

Author SHA1 Message Date
Kevin P. Neal ddf13c00ed [FPEnv] Add fptosi and fptoui constrained intrinsics.
This implements constrained floating point intrinsics for FP to signed and
unsigned integers.

Quoting from D32319:
The purpose of the constrained intrinsics is to force the optimizer to
respect the restrictions that will be necessary to support things like the
STDC FENV_ACCESS ON pragma without interfering with optimizations when
these restrictions are not needed.

Reviewed by:	Andrew Kaylor, Craig Topper, Hal Finkel, Cameron McInally, Roman Lebedev, Kit Barton
Approved by:	Craig Topper
Differential Revision:	http://reviews.llvm.org/D63782

llvm-svn: 370228
2019-08-28 16:33:36 +00:00
Kevin P. Neal 5987749e33 Add constrained fptrunc and fpext intrinsics.
The new fptrunc and fpext intrinsics are constrained versions of the
regular fptrunc and fpext instructions.

Reviewed by:	Andrew Kaylor, Craig Topper, Cameron McInally, Conner Abbot
Approved by:	Craig Topper
Differential Revision: https://reviews.llvm.org/D55897

llvm-svn: 360581
2019-05-13 13:23:30 +00:00
Cameron McInally 94b9029be9 [FPEnv] Support constrained FREM intrinsic
Differential Revision: https://reviews.llvm.org/D50975

llvm-svn: 340201
2018-08-20 19:28:56 +00:00
Cameron McInally 7caac670b2 [FPEnv] Expand constrained FP POWI
Modify ExpandStrictFPOp(...) to handle nodes that have scalar
operands. 

Also, add a Strict FMA test and do some other light cleanup in the
Strict FP code.

Differential Revision: https://reviews.llvm.org/D48149

llvm-svn: 334863
2018-06-15 20:57:55 +00:00
Rafael Espindola 63c378d343 Go back to sometimes assuming intristics are local.
This fixes pr36674.

While it is valid for shouldAssumeDSOLocal to return false anytime,
always returning false for intrinsics is not optimal on i386 and also
hits a bug in the backend.

To use a plt, the caller must first setup ebx to handle the case of
that file being linked into a PIE executable or shared library. In
those cases the generated PLT uses ebx.

Currently we can produce "calll expf@plt" without setting ebx. We
could fix that by correctly setting ebx, but this would produce worse
code for the case where the runtime library is statically linked. It
would also required other tools to handle R_386_PLT32.

llvm-svn: 327198
2018-03-10 02:42:14 +00:00
Rafael Espindola c7e51805ff Bring back r323297.
It was reverted because it broke the grub build. The reason the grub
build broke is because grub does its own relocation processing and was
not handing R_386_PLT32. Since grub has no dynamic linker, the fix is
trivial: handle R_386_PLT32 exactly like R_386_PC32.

On the report it was noted that they are using
-fno-integrated-assembler. The upstream GAS (starting with
451875b4f976a527395e9303224c7881b65e12ed) will already be producing a
R_386_PLT32 anyway, so they have to update their code one way or the
other

Original message:

Don't assume a null GV is local for ELF and MachO.

This is already a simplification, and should help with avoiding a plt
reference when calling an intrinsic with -fno-plt.

With this change we return false for null GVs, so the caller only
needs to check the new metadata to decide if it should use foo@plt or
*foo@got.

llvm-svn: 325514
2018-02-19 16:02:38 +00:00
Reid Kleckner 697d1bc236 Revert "Don't assume a null GV is local for ELF and MachO."
This reverts r323297.

It breaks building grub.

llvm-svn: 324301
2018-02-06 00:47:14 +00:00
Rafael Espindola 432a587cf0 Don't assume a null GV is local for ELF and MachO.
This is already a simplification, and should help with avoiding a plt
reference when calling an intrinsic with -fno-plt.

With this change we return false for null GVs, so the caller only
needs to check the new metadata to decide if it should use foo@plt or
*foo@got.

llvm-svn: 323297
2018-01-24 02:11:18 +00:00
Wei Ding a131d3fb29 Add ‘llvm.experimental.constrained.fma‘ Intrinsic.
Differential Revision: http://reviews.llvm.org/D36335

llvm-svn: 311629
2017-08-24 04:18:24 +00:00
Andrew Kaylor f466001eef Add constrained intrinsics for some libm-equivalent operations
Differential revision: https://reviews.llvm.org/D32319

llvm-svn: 303922
2017-05-25 21:31:00 +00:00
Andrew Kaylor a0a1164ce4 Add intrinsics for constrained floating point operations
This commit introduces a set of experimental intrinsics intended to prevent
optimizations that make assumptions about the rounding mode and floating point
exception behavior.  These intrinsics will later be extended to specify
flush-to-zero behavior.  More work is also required to model instruction
dependencies in machine code and to generate these instructions from clang
(when required by pragmas and/or command line options that are not currently
supported).

Differential Revision: https://reviews.llvm.org/D27028

llvm-svn: 293226
2017-01-26 23:27:59 +00:00