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40453da779
llvm/test
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Ahmed Bougacha 40453da779 [X86] 8bit divrem: Improve codegen for AH register extraction. 
For 8-bit divrems where the remainder is used, we used to generate:
    divb  %sil
    shrw  $8, %ax
    movzbl  %al, %eax

That was to avoid an H-reg access, which is problematic mainly because
it isn't possible in REX-prefixed instructions.

This patch optimizes that to:
    divb  %sil
    movzbl  %ah, %eax

To do that, we explicitly extend AH, and extract the L-subreg in the
resulting register.  The extension is done using the NOREX variants of
MOVZX.  To support signed operations, MOVSX_NOREX is also added.
Further, this introduces a new SDNode type, [us]divrem_ext_hreg, which is
then lowered to a sequence containing a single zext (rather than 2).

Differential Revision: http://reviews.llvm.org/D6064


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221176 91177308-0d34-0410-b5e6-96231b3b80d8
2014-11-03 20:26:35 +00:00
..
Analysis [SCEV] Improve Scalar Evolution's use of no {un,}signed wrap flags 2014-10-31 11:40:32 +00:00
Assembler Delete -std-compile-opts. 2014-10-16 20:00:02 +00:00
Bindings [OCaml] Run tests twice, with ocamlc and ocamlopt (if available) 2014-11-03 09:50:53 +00:00
Bitcode Revert "Revert "DI: Fold constant arguments into a single MDString"" 2014-10-03 20:01:09 +00:00
BugPoint Revert "Revert "DI: Fold constant arguments into a single MDString"" 2014-10-03 20:01:09 +00:00
CodeGen [X86] 8bit divrem: Improve codegen for AH register extraction. 2014-11-03 20:26:35 +00:00
DebugInfo Revert r221150, as it broke sanitizer tests 2014-11-03 12:19:03 +00:00
ExecutionEngine [MCJIT] Defer application of AArch64 MachO GOT relocations until resolve time. 2014-10-21 23:41:15 +00:00
Feature Delete -std-compile-opts. 2014-10-16 20:00:02 +00:00
FileCheck FileCheck: Add a flag to allow checking empty input 2014-08-07 18:40:37 +00:00
Instrumentation [asan] do not treat inline asm calls as indirect calls 2014-10-31 18:38:23 +00:00
Integer
JitListener Revert "Revert "DI: Fold constant arguments into a single MDString"" 2014-10-03 20:01:09 +00:00
Linker Revert r221096 bringing back r221014 with a fix. 2014-11-02 13:28:57 +00:00
LTO LTO: Add missing target triple from r218784 2014-10-01 18:49:58 +00:00
MC Remove the cortex-a9-mp CPU. 2014-11-03 17:38:00 +00:00
Object Add CRLF support to LineIterator. 2014-11-03 14:09:47 +00:00
Other [lit] Parse all strings as UTF-8 rather than ASCII. 2014-09-12 16:46:05 +00:00
TableGen [AVX512] Added intrinsics for VPCMPEQB and VPCMPEQW. 2014-09-30 11:32:22 +00:00
tools Forgot to add input file for test added in r221133 2014-11-03 07:58:16 +00:00
Transforms EarlyCSE should ignore calls to @llvm.assume 2014-11-03 20:21:32 +00:00
Unit Let test/Unit/lit.cfg add config.shlibdir to $PATH on DLL platforms like cygming. 2014-07-04 05:11:55 +00:00
Verifier Extend the verifier to validate range metadata on calls and invokes. 2014-10-20 23:52:07 +00:00
YAMLParser
.clang-format
CMakeLists.txt Make llvm-go test dependency optional. 2014-10-23 19:51:40 +00:00
lit.cfg Unbreak build. 2014-11-03 09:58:41 +00:00
lit.site.cfg.in [OCaml] [autoconf] Migrate to ocamlfind. 2014-10-30 08:29:45 +00:00
Makefile [OCaml] [autoconf] Migrate to ocamlfind. 2014-10-30 08:29:45 +00:00
Makefile.tests
TestRunner.sh