Commit Graph

339 Commits

Author SHA1 Message Date
Guillaume Chatelet 805c157e8a [Alignment][NFC] Deprecate Align::None()
Summary:
This is a follow up on https://reviews.llvm.org/D71473#inline-647262.
There's a caveat here that `Align(1)` relies on the compiler understanding of `Log2_64` implementation to produce good code. One could use `Align()` as a replacement but I believe it is less clear that the alignment is one in that case.

Reviewers: xbolva00, courbet, bollu

Subscribers: arsenm, dylanmckay, sdardis, nemanjai, jvesely, nhaehnle, hiraditya, kbarton, jrtc27, atanasyan, jsji, Jim, kerbowa, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D73099
2020-01-24 12:53:58 +01:00
Sanjay Patel 19f9f374d9 [SimplifyLibCalls] require fast-math-flags for pow(X, -0.5) transforms
As discussed in PR44330:
https://bugs.llvm.org/show_bug.cgi?id=44330
...the transform from pow(X, -0.5) libcall/intrinsic to
reciprocal square root can result in small deviations from
the expected result due to differences in the pow()
implementation and/or the extra rounding step from the division.

This patch proposes to allow that difference with either the
'approximate functions' or 'reassociate' FMF:
http://llvm.org/docs/LangRef.html#fast-math-flags

In practice, this likely means that the code is compiled with
all of 'fast' (-ffast-math), but I have preserved the existing
specializations for -0.0/-INF that enable generating safe code
if those special values are allowed simultaneously with
allowing approximation/reassociation.

The question about whether a similar restriction is needed for
the non-reciprocal case -- pow(X, 0.5) -- is deferred. That
transform is allowed without FMF currently, and this patch does
not change that behavior.

Differential Revision: https://reviews.llvm.org/D71706
2019-12-21 10:00:53 -05:00
Guillaume Chatelet 531c1161b9 Resubmit "[Alignment][NFC] Deprecate CreateMemCpy/CreateMemMove"
Summary:
This is a resubmit of D71473.

This patch introduces a set of functions to enable deprecation of IRBuilder functions without breaking out of tree clients.
Functions will be deprecated one by one and as in tree code is cleaned up.

This is patch is part of a series to introduce an Alignment type.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
See this patch for the introduction of the type: https://reviews.llvm.org/D64790

Reviewers: aaron.ballman, courbet

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D71547
2019-12-17 10:07:46 +01:00
Guillaume Chatelet 4658da10e4 Revert "[Alignment][NFC] Deprecate CreateMemCpy/CreateMemMove"
This reverts commit 181ab91efc.
2019-12-16 15:19:49 +01:00
Guillaume Chatelet 181ab91efc [Alignment][NFC] Deprecate CreateMemCpy/CreateMemMove
Summary:
This patch introduces a set of functions to enable deprecation of IRBuilder functions without breaking out of tree clients.
Functions will be deprecated one by one and as in tree code is cleaned up.

This is patch is part of a series to introduce an Alignment type.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
See this patch for the introduction of the type: https://reviews.llvm.org/D64790

Reviewers: courbet

Subscribers: arsenm, jvesely, nhaehnle, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D71473
2019-12-16 13:35:55 +01:00
Guillaume Chatelet 1b2842bf90 [Alignment][NFC] CreateMemSet use MaybeAlign
Summary:
This is patch is part of a series to introduce an Alignment type.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
See this patch for the introduction of the type: https://reviews.llvm.org/D64790

Reviewers: courbet

Subscribers: arsenm, jvesely, nhaehnle, hiraditya, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D71213
2019-12-10 15:17:44 +01:00
Ehud Katz 2b6b8cb10c [APFloat] Prevent construction of APFloat with Semantics and FP value
Constructor invocations such as `APFloat(APFloat::IEEEdouble(), 0.0)`
may seem like they accept a FP (floating point) value, but the overload
they reach is actually the `integerPart` one, not a `float` or `double`
overload (which only exists when `fltSemantics` isn't passed).

This may lead to possible loss of data, by the conversion from `float`
or `double` to `integerPart`.

To prevent future mistakes, a new constructor overload, which accepts
any FP value and marked with `delete`, to prevent its usage.

Fixes PR34095.

Differential Revision: https://reviews.llvm.org/D70425
2019-12-04 12:02:04 +02:00
Hiroshi Yamauchi 8cdfdfeee6 [PGO][PGSO] Add an optional query type parameter to shouldOptimizeForSize.
Summary:
In case of a need to distinguish different query sites for gradual commit or
debugging of PGSO. NFC.

Reviewers: davidxl

Subscribers: hiraditya, zzheng, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70510
2019-12-02 13:54:13 -08:00
Dávid Bolvanský 0e32fbd223 [InstCombine] Fixed std::min on some bots. NFCI 2019-11-26 11:06:31 +01:00
Dávid Bolvanský bb7b8540f0 [InstCombine] Optimize some memccpy calls to memcpy/null
Summary:
return memccpy(d, "helloworld", 'r', 20)
=>
return memcpy(d, "helloworld", 8 /* pos of 'r' in string */), d + 8

Reviewers: efriedma, jdoerfert

Reviewed By: jdoerfert

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68089
2019-11-26 10:54:47 +01:00
Dimitry Andric 3db6783d8a Check result of emitStrLen before passing it to CreateGEP
Summary:
This fixes PR43081, where the transformation of `strchr(p, 0) -> p +
strlen(p)` can cause a segfault, if `-fno-builtin-strlen` is used.  In
that case, `emitStrLen` returns nullptr, which CreateGEP is not designed
to handle.  Also add the minimized code from the PR as a test case.

Reviewers: xbolva00, spatel, jdoerfert, efriedma

Reviewed By: efriedma

Subscribers: lebedev.ri, hiraditya, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D70143
2019-11-14 08:04:36 +01:00
Guillaume Chatelet 301b4128ac [Alignment][NFC] Finish transition for `Loads`
Summary:
This is patch is part of a series to introduce an Alignment type.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
See this patch for the introduction of the type: https://reviews.llvm.org/D64790

Reviewers: courbet

Subscribers: hiraditya, asbirlea, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69253

llvm-svn: 375419
2019-10-21 15:10:26 +00:00
Evandro Menezes 8bd4276981 [InstCombine] Add test case for PR43617 (NFC)
Also, refactor check in `LibCallSimplifier::optimizeLog()`.

llvm-svn: 374453
2019-10-10 21:29:10 +00:00
Evandro Menezes d2f4c452d9 [InstCombine] Fix PR43617
Check for `nullptr` before inspecting composite function.

llvm-svn: 374243
2019-10-09 22:03:23 +00:00
Evandro Menezes e60415a0db [Support] Add mathematical constants
Add own version of the mathematical constants from the upcoming C++20 `std::numbers`.

Differential revision: https://reviews.llvm.org/D68257

llvm-svn: 374207
2019-10-09 19:58:01 +00:00
David Bolvansky 6b45029676 [InstCombine] Transform bcopy to memmove
bcopy is still widely used mainly for network apps. Sadly, LLVM has no optimizations for bcopy, but there are some for memmove. 
Since bcopy == memmove, it is profitable to transform bcopy to memmove and use current optimizations for memmove for free here.

llvm-svn: 373537
2019-10-02 22:49:20 +00:00
David Bolvansky 4037582d6b Revert [InstCombine] sprintf(dest, "%s", str) -> memccpy(dest, str, 0, MAX)
Seems to be slower than memcpy + strlen.

llvm-svn: 373335
2019-10-01 13:19:04 +00:00
David Bolvansky 8fc6a1bf56 [InstCombine] sprintf(dest, "%s", str) -> memccpy(dest, str, 0, MAX)
llvm-svn: 373333
2019-10-01 13:03:10 +00:00
Evandro Menezes 41ead4281f [SimplifyLibCalls] Define the value of the Euler number
This patch fixes the build break on Windows hosts.

There must be a better way of accessing the equivalent POSIX math constant
`M_E`.

llvm-svn: 373274
2019-09-30 23:21:02 +00:00
Evandro Menezes 110b1138ba [InstCombine] Expand the simplification of log()
Expand the simplification of special cases of `log()` to include `log2()`
and `log10()` as well as intrinsics and more types.

Differential revision: https://reviews.llvm.org/D67199

llvm-svn: 373261
2019-09-30 20:52:21 +00:00
David Bolvansky 8d52016155 [SLC] Convert some strndup calls to strdup calls
Summary:
Motivation:
- If we can fold it to strdup, we should (strndup does more things than strdup).
- Annotation mechanism. (Works for strdup well).

strdup and strndup are part of C 20 (currently posix fns), so we should optimize them.

Reviewers: efriedma, jdoerfert

Reviewed By: jdoerfert

Subscribers: lebedev.ri, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67679

llvm-svn: 372636
2019-09-23 18:20:01 +00:00
Sanjay Patel d46bf63fbb [SimplifyLibCalls] fix crash with empty function name (PR43347)
...and improve some variable names while here.

https://bugs.llvm.org/show_bug.cgi?id=43347

llvm-svn: 372227
2019-09-18 14:33:40 +00:00
David Bolvansky 0c0de794f1 Reland "[SLC] Preserve attrs for strncpy(x, "", y) -> memset(align 1 x, '\0', y)"
llvm-svn: 372142
2019-09-17 17:12:24 +00:00
Krasimir Georgiev bdff164e0e Revert "[SLC] Preserve attrs for strncpy(x, "", y) -> memset(align 1 x, '\0', y)"
Summary:
This reverts commit r372101.

Causes ASAN build bot failures:

http://lab.llvm.org:8011/builders/sanitizer-ppc64be-linux/builds/14176
From http://lab.llvm.org:8011/builders/sanitizer-ppc64be-linux/builds/14176/steps/64-bit%20check-asan/logs/stdio:

```
[ RUN      ] AddressSanitizer.StrNCatOOBTest
/home/buildbots/ppc64be-sanitizer/sanitizer-ppc64be/build/llvm-project/compiler-rt/lib/asan/tests/asan_str_test.cpp:462: Failure
Death test: strncat(to - 1, from, 0)
    Result: failed to die.
```

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67658

llvm-svn: 372125
2019-09-17 14:15:23 +00:00
David Bolvansky ded48e93e6 [SLC] Preserve attrs for strncpy(x, "", y) -> memset(align 1 x, '\0', y)
llvm-svn: 372101
2019-09-17 10:25:38 +00:00
David Bolvansky 3a3dddd9d7 [NFCI] Fixed buildbots
llvm-svn: 372097
2019-09-17 10:03:45 +00:00
Fangrui Song 8351763709 [SimplifyLibCalls] Fix -Wunused-result after D53342/r372091
llvm-svn: 372096
2019-09-17 09:56:55 +00:00
David Bolvansky e80fcf0340 [SimplifyLibCalls] Mark known arguments with nonnull
Reviewers: efriedma, jdoerfert

Reviewed By: jdoerfert

Subscribers: ychen, rsmith, joerg, aaron.ballman, lebedev.ri, uenoku, jdoerfert, hfinkel, javed.absar, spatel, dmgreen, llvm-commits

Differential Revision: https://reviews.llvm.org/D53342

llvm-svn: 372091
2019-09-17 09:32:52 +00:00
Evandro Menezes 7d677adf2d [InstCombine] Refactor substitution of instruction in the parent BB (NFC)
Add the new method `LibCallSimplifier::substituteInParent()` that calls
`LibCallSimplifier::replaceAllUsesWith()' and
`LibCallSimplifier::eraseFromParent()` back to back, simplifying the
resulting code.

llvm-svn: 371264
2019-09-06 22:07:11 +00:00
Sanjay Patel 4f0e429acc [SimplifyLibCalls] handle pow(x,-0.0) before it can assert (PR43233)
https://bugs.llvm.org/show_bug.cgi?id=43233

llvm-svn: 371221
2019-09-06 16:10:18 +00:00
David Bolvansky ff0ad3c43d [InstCombine] mempcpy(d,s,n) to memcpy(d,s,n) + n
Summary:
Back-end currently expands mempcpy, but middle-end should work with memcpy instead of mempcpy to enable more memcpy-optimization.

GCC backend emits mempcpy, so LLVM backend could form it too, if we know mempcpy libcall is better than memcpy + n.
https://godbolt.org/z/dOCG96

Reviewers: efriedma, spatel, craig.topper, RKSimon, jdoerfert

Reviewed By: efriedma

Subscribers: hjl.tools, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D65737

llvm-svn: 370593
2019-08-31 18:19:05 +00:00
Evandro Menezes 05e9c2ac2e [InstCombine] Simplify pow(2.0, itofp(y)) to ldexp(1.0, y)
Simplify `pow(2.0, itofp(y))` to `ldexp(1.0, y)`.

Differential revision: https://reviews.llvm.org/D65979

llvm-svn: 369120
2019-08-16 15:33:41 +00:00
David Bolvansky f94460d4b6 [SLC] Dereferenceable annonation - handle valid null pointers
Reviewers: jdoerfert, reames

Reviewed By: jdoerfert

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66161

llvm-svn: 368884
2019-08-14 17:15:20 +00:00
David Bolvansky 0e0fbae1a4 [BuildLibCalls] Noalias annotation
Summary: I think this is better solution than annotating callsites in IC/SLC.

Reviewers: jdoerfert

Reviewed By: jdoerfert

Subscribers: MaskRay, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66217

llvm-svn: 368875
2019-08-14 16:50:06 +00:00
David Bolvansky 038d604f4f [SimplifyLibCalls] Add noalias from known callsites
Summary:
Should be fine for memcpy, strcpy, strncpy.


Reviewers: jdoerfert, efriedma

Reviewed By: jdoerfert

Subscribers: uenoku, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66135

llvm-svn: 368724
2019-08-13 17:18:46 +00:00
David Bolvansky 90a30fdcc3 [SLC] Improve dereferenceable bytes annotation
llvm-svn: 368715
2019-08-13 16:44:16 +00:00
David Bolvansky 39130314fe [SimplifyLibCalls] Add dereferenceable bytes from known callsites
Summary:
int mm(char *a, char *b) {
    return memcmp(a,b,16);
}

Currently:
define dso_local i32 @mm(i8* nocapture readonly %a, i8* nocapture readonly %b) local_unnamed_addr #1 {
entry:
  %call = tail call i32 @memcmp(i8* %a, i8* %b, i64 16)
  ret i32 %call
}

After patch:
define dso_local i32 @mm(i8* nocapture readonly %a, i8* nocapture readonly %b) local_unnamed_addr #1 {
entry:
  %call = tail call i32 @memcmp(i8* dereferenceable(16)  %a, i8* dereferenceable(16)  %b, i64 16)
  ret i32 %call
}




Reviewers: jdoerfert, efriedma

Reviewed By: jdoerfert

Subscribers: javed.absar, spatel, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66079

llvm-svn: 368657
2019-08-13 09:11:49 +00:00
Evandro Menezes 59fbe516bd [InstCombine] Refactor optimizeExp2() (NFC)
Refactor `LibCallSimplifier::optimizeExp2()` to use the new
`emitBinaryFloatFnCall()` version that fetches the function name from TLI.

llvm-svn: 368457
2019-08-09 17:22:56 +00:00
Evandro Menezes c6c00cdf2e [Transforms] Rename hasUnaryFloatFn() and getUnaryFloatFn() (NFC)
Rename `hasUnaryFloatFn()` to `hasFloatFn()` and `getUnaryFloatFn()` to `getFloatFnName()`.

llvm-svn: 368449
2019-08-09 16:04:18 +00:00
Evandro Menezes 5cd5f9b65d [InstCombine] Swap order of checks to improve compile time (NFC)
llvm-svn: 366962
2019-07-24 23:31:04 +00:00
Evandro Menezes b21692672e [InstCombine] Reorder pow() transformations (NFC)
Move the transformation from `powf(x, itofp(y))` to `powi(x, y)` to the
group of transformations related to the exponent.

llvm-svn: 365851
2019-07-12 00:33:49 +00:00
David Bolvansky e23be09e66 [InstCombine] Reorder recently added/improved pow transformations
Changed cases are now faster with exp2.

llvm-svn: 365758
2019-07-11 10:55:04 +00:00
David Bolvansky 0735cc1954 [InstCombine] pow(C,x) -> exp2(log2(C)*x)
Summary:
Transform
pow(C,x) 

To
exp2(log2(C)*x) 

if C > 0, C != inf, C != NaN (and C is not power of 2, since we have some fold for such case already).

log(C) is folded by the compiler and exp2 is much faster to compute than pow.

Reviewers: spatel, efriedma, evandro

Reviewed By: evandro

Subscribers: lebedev.ri, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D64099

llvm-svn: 365637
2019-07-10 14:43:27 +00:00
David Bolvansky 10ee3ac396 [NFC] Strenghten isInteger condition for rL364940
llvm-svn: 364969
2019-07-02 21:16:34 +00:00
David Bolvansky cb1a5a705c [SimplifyLibCalls] powf(x, sitofp(n)) -> powi(x, n)
Summary:
Partially solves https://bugs.llvm.org/show_bug.cgi?id=42190



Reviewers: spatel, nikic, efriedma

Reviewed By: efriedma

Subscribers: efriedma, nikic, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63038

llvm-svn: 364940
2019-07-02 15:58:45 +00:00
Sanjay Patel 77dc1e8568 [InstCombine] canonicalize fmin/fmax to LLVM intrinsics minnum/maxnum
This transform came up in D62414, but we should deal with it first.
We have LLVM intrinsics that correspond exactly to libm calls (unlike
most libm calls, these libm calls never set errno).
This holds without any fast-math-flags, so we should always canonicalize
to those intrinsics directly for better optimization.
Currently, we convert to fcmp+select only when we have FMF (nnan) because
fcmp+select does not preserve the semantics of the call in the general case.

Differential Revision: https://reviews.llvm.org/D63214

llvm-svn: 364714
2019-06-29 14:28:54 +00:00
Erik Pilkington abb2a93c53 [SimplifyLibCalls] Fold more fortified functions into non-fortified variants
When the object size argument is -1, no checking can be done, so calling the
_chk variant is unnecessary. We already did this for a bunch of these
functions.

rdar://50797197

Differential revision: https://reviews.llvm.org/D62358

llvm-svn: 362272
2019-05-31 22:41:36 +00:00
Erik Pilkington 5234921119 NFC: Pull out a function to reduce some duplication
Part of https://reviews.llvm.org/D62358

llvm-svn: 362271
2019-05-31 22:41:31 +00:00
Simon Pilgrim 364ef5db2b Pull out repeated CI->getCalledFunction() calls. NFCI.
llvm-svn: 360070
2019-05-06 19:51:54 +00:00
Clement Courbet 9e1f2a7fe7 [SimplifyLibCalls] Simplify bcmp too.
Summary: Fixes PR40699.

Reviewers: gchatelet

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D61585

llvm-svn: 360021
2019-05-06 09:15:22 +00:00