Ahmed Bougacha 4d962b05ca [X86] Improve mul w/ overflow codegen, to MUL8+SETO. ... Currently, @llvm.smul.with.overflow.i8 expands to 9 instructions, where 3 are really needed. This adds X86ISD::UMUL8/SMUL8 SD nodes, and custom lowers them to MUL8/IMUL8 + SETO. i8 is a special case because there is no two/three operand variants of (I)MUL8, so the first operand and return value need to go in AL/AX. Also, we can't write patterns for these instructions: TableGen refuses patterns where output operands don't match SDNode results. In this case, instructions where the output operand is an implicitly defined register. A related special case (and FIXME) exists for MUL8 (X86InstrArith.td): // FIXME: Used for 8-bit mul, ignore result upper 8 bits. // This probably ought to be moved to a def : Pat<> if the // syntax can be accepted. [(set AL, (mul AL, GR8:$src)), (implicit EFLAGS)] Ideally, these go away with UMUL8, but we still need to improve TableGen support of implicit operands in patterns. Before this change: movsbl %sil, %eax movsbl %dil, %ecx imull %eax, %ecx movb %cl, %al sarb $7, %al movzbl %al, %eax movzbl %ch, %esi cmpl %eax, %esi setne %al After: movb %dil, %al imulb %sil seto %al Also, remove a made-redundant testcase for PR19858, and enable more FastISel ALU-overflow tests for SelectionDAG too. Differential Revision: http://reviews.llvm.org/D5809 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220516 91177308-0d34-0410-b5e6-96231b3b80d8		2014-10-23 21:55:31 +00:00
..
Analysis	[DSE] Remove no-data-layout-only type-based overlap checking	2014-10-17 11:56:00 +00:00
Assembler	Delete -std-compile-opts.	2014-10-16 20:00:02 +00:00
Bindings	Add llvm-go tool.	2014-10-23 02:33:23 +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] Improve mul w/ overflow codegen, to MUL8+SETO.	2014-10-23 21:55:31 +00:00
DebugInfo	DebugInfo: Simplify/tidy/correct global variable decl/def emission handling.	2014-10-23 19:12:43 +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-asm-instrumentation] Fixed memory accesses with rbp as a base or an index register.	2014-10-21 10:22:27 +00:00
Integer
JitListener	Revert "Revert "DI: Fold constant arguments into a single MDString""	2014-10-03 20:01:09 +00:00
Linker	Cleanup this test a bit.	2014-10-23 19:36:21 +00:00
LTO	LTO: Add missing target triple from r218784	2014-10-01 18:49:58 +00:00
MC	Revert r220427, "[Hexagon] Adding encoding bits for add opcode."	2014-10-23 11:31:22 +00:00
Object	Handle spaces and quotes in file names in MRI scripts.	2014-10-22 03:10:56 +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	Update llvm-objdump’s Mach-O symbolizer code for Objective-C references.	2014-10-23 19:37:31 +00:00
Transforms	Handle sqrt() shrinking in SimplifyLibCalls like any other call	2014-10-23 21:52:45 +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	Add llvm-go tool.	2014-10-23 02:33:23 +00:00
lit.site.cfg.in	Teach lit to filter the host LDFLAGS down from the build system and into	2014-10-21 00:36:28 +00:00
Makefile	Teach lit to filter the host LDFLAGS down from the build system and into	2014-10-21 00:36:28 +00:00
Makefile.tests
TestRunner.sh