Sanjay Patel 7477a9a155 Fast-math fold: x / (y * sqrt(z)) -> x * (rsqrt(z) / y) ... The motivation is to recognize code such as this from /llvm/projects/test-suite/SingleSource/Benchmarks/BenchmarkGame/n-body.c: float distance = sqrt(dx * dx + dy * dy + dz * dz); float mag = dt / (distance * distance * distance); Without this patch, we don't match the sqrt as a reciprocal sqrt, so for PPC the new testcase in this patch produces: addis 3, 2, .LCPI4_2@toc@ha lfs 4, .LCPI4_2@toc@l(3) addis 3, 2, .LCPI4_1@toc@ha lfs 0, .LCPI4_1@toc@l(3) fcmpu 0, 1, 4 beq 0, .LBB4_2 # BB#1: frsqrtes 4, 1 addis 3, 2, .LCPI4_0@toc@ha lfs 5, .LCPI4_0@toc@l(3) fnmsubs 13, 1, 5, 1 fmuls 6, 4, 4 fmadds 1, 13, 6, 5 fmuls 1, 4, 1 fres 4, 1 <--- reciprocal of reciprocal square root fnmsubs 1, 1, 4, 0 fmadds 4, 4, 1, 4 .LBB4_2: fmuls 1, 4, 2 fres 2, 1 fnmsubs 0, 1, 2, 0 fmadds 0, 2, 0, 2 fmuls 1, 3, 0 blr After the patch, this simplifies to: frsqrtes 0, 1 addis 3, 2, .LCPI4_1@toc@ha fres 5, 2 lfs 4, .LCPI4_1@toc@l(3) addis 3, 2, .LCPI4_0@toc@ha lfs 7, .LCPI4_0@toc@l(3) fnmsubs 13, 1, 4, 1 fmuls 6, 0, 0 fnmsubs 2, 2, 5, 7 fmadds 1, 13, 6, 4 fmadds 2, 5, 2, 5 fmuls 0, 0, 1 fmuls 0, 0, 2 fmuls 1, 3, 0 blr Differential Revision: http://reviews.llvm.org/D5628 llvm-svn: 219139		2014-10-06 19:31:18 +00:00
..
Analysis	[BasicAA] Revert "Revert r218714 - Make better use of zext and sign information."	2014-10-06 18:37:59 +00:00
AsmParser	Make CallingConv::ID an alias of "unsigned".	2014-09-10 18:00:17 +00:00
Bitcode	Do not destroy external linkage when deleting function body	2014-09-23 12:54:19 +00:00
CodeGen	Fast-math fold: x / (y * sqrt(z)) -> x * (rsqrt(z) / y)	2014-10-06 19:31:18 +00:00
DebugInfo	Refactor RelocVisitor to take an object. This removes some	2014-10-06 06:55:55 +00:00
ExecutionEngine	[MCJIT] Don't crash in debugging output for sections that aren't emitted.	2014-10-01 21:57:47 +00:00
IR	[PM] Remove an unused and rather expensive mapping from an analysis	2014-10-06 00:30:59 +00:00
IRReader	Pass a && to getLazyBitcodeModule.	2014-09-03 17:31:46 +00:00
LineEditor
Linker	Merge alignment of common GlobalValue.	2014-09-09 17:48:18 +00:00
LTO	LTO: Document the Boolean argument from r218784	2014-10-02 21:11:04 +00:00
MC	MachObjectWriter: optimize the string table for common suffices	2014-10-06 17:05:19 +00:00
Object	llvm-readobj: print out the fields of the COFF delay-import table	2014-10-03 18:07:18 +00:00
Option	Add an overload of getLastArgNoClaim taking two OptSpecifiers.	2014-09-12 19:42:53 +00:00
ProfileData	Eliminate some deep std::vector copies. NFC.	2014-10-03 18:33:16 +00:00
Support	Make the MD5 result name consistent between functions, header and source.	2014-10-06 13:48:07 +00:00
TableGen	Eliminate some deep std::vector copies. NFC.	2014-10-03 18:33:16 +00:00
Target	ARM: silence unused variable warning	2014-10-06 17:26:36 +00:00
Transforms	Give the Reassociate pass a bit more flexibility and autonomy when optimizing expressions.	2014-10-05 23:41:26 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile