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Bjorn Pettersson d065c81164 [CodeGen] Handle SMULFIXSAT with scale zero in TargetLowering::expandFixedPointMul 
Summary:
Normally TargetLowering::expandFixedPointMul would handle
SMULFIXSAT with scale zero by using an SMULO to compute the
product and determine if saturation is needed (if overflow
happened). But if SMULO isn't custom/legal it falls through
and uses the same technique, using MULHS/SMUL_LOHI, as used
for non-zero scales.

Problem was that when checking for overflow (handling saturation)
when not using MULO we did not expect to find a zero scale. So
we ended up in an assertion when doing
  APInt::getLowBitsSet(VTSize, Scale - 1)

This patch fixes the problem by adding a new special case for
how saturation is computed when scale is zero.

Reviewers: RKSimon, bevinh, leonardchan, spatel

Reviewed By: RKSimon

Subscribers: wuzish, nemanjai, hiraditya, MaskRay, jsji, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67071

llvm-svn: 371309
 		2019-09-07 12:16:23 +00:00
clang Remove stale TLI Module level pass registration 2019-09-07 03:09:46 +00:00
clang-tools-extra [clang][Index][NFC] Put IndexingOptions to a separate header 2019-09-06 20:08:32 +00:00
compiler-rt Revert "Revert "[builtins] Rounding mode support for addxf3/subxf3"" 2019-09-05 01:05:05 +00:00
debuginfo-tests Make nrvo-string test more robust. 2019-06-27 20:38:37 +00:00
libclc Revert "Rename F_{None,Text,Append} to OF_{None,Text,Append}. NFC" 2019-08-05 17:23:23 +00:00
libcxx Add gdb pretty printers for a wide variety of libc++ data structures (take 2). 2019-09-05 21:35:05 +00:00
libcxxabi Synchronize LLVM's copy of libc++abi's demangler with the libc++abi 2019-09-07 00:11:53 +00:00
libunwind [runtimes] Don't depend on libpthread on Android 2019-07-22 20:41:03 +00:00
lld [ELF][test] Improve tests 2019-09-07 10:42:11 +00:00
lldb Long timeouts for the MacOSX SystemRuntime plugins under ASAN; else quick. 2019-09-07 01:38:37 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm [CodeGen] Handle SMULFIXSAT with scale zero in TargetLowering::expandFixedPointMul 2019-09-07 12:16:23 +00:00
openmp [OpenMP] Change initialization of __kmp_global 2019-09-04 17:47:37 +00:00
parallel-libs Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
polly [DependenceInfo] Compute WAR dependence info using ISL kills. NFC. 2019-08-29 18:55:55 +00:00
pstl [pstl] Allow customizing whether per-TU insulation is provided 2019-08-13 12:49:00 +00:00
.arcconfig Update monorepo .arcconfig with new project callsign. 2019-01-31 14:34:59 +00:00
.clang-format Add .clang-tidy and .clang-format files to the toplevel of the 2019-01-29 16:43:16 +00:00
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.git-blame-ignore-revs Add LLDB reformatting to .git-blame-ignore-revs 2019-09-04 09:31:55 +00:00
.gitignore Add a newline at the end of the file 2019-09-04 06:33:46 +00:00
README.md
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README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.