llvm/lib
Ulrich Weigand 55474c1f67 [SystemZ] Avoid LER on z13 due to partial register dependencies
On the z13, it turns out to be more efficient to access a full
floating-point register than just the upper half (as done e.g.
by the LE and LER instructions).

Current code already takes this into account when loading from
memory by using the LDE instruction in place of LE.  However,
we still generate LER, which shows the same performance issues
as LE in certain circumstances.

This patch changes the back-end to emit LDR instead of LER to
implement FP32 register-to-register copies on z13.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263431 91177308-0d34-0410-b5e6-96231b3b80d8
2016-03-14 13:50:03 +00:00
..
Analysis ConstantFoldInstruction: avoid wasted calls to ConstantFoldConstantExpression 2016-03-13 05:36:15 +00:00
AsmParser Add a flag to the LLVMContext to disable name for Value other than GlobalValue 2016-03-10 01:28:54 +00:00
Bitcode [Bitcode] Make writeComdats less strange 2016-03-13 08:01:03 +00:00
CodeGen Recommitted r261633 "Supporting all entities declared in lexical scope in LLVM debug info." 2016-03-14 12:03:20 +00:00
DebugInfo [DebugInfo] Dump CIE augmentation data as a list of hex bytes 2016-03-01 18:38:05 +00:00
ExecutionEngine ExecutionEngine: tweak debug log 2016-03-05 20:00:41 +00:00
Fuzzer [libFuzzer] try to use max_len based on the items of the corpus instead of blindly defaulting to 64 bytes. 2016-03-12 01:57:04 +00:00
IR Add facility to add/remove/check attribute on function and arguments. 2016-03-14 01:37:29 +00:00
IRReader Remove autoconf support 2016-01-26 21:29:08 +00:00
LibDriver Remove autoconf support 2016-01-26 21:29:08 +00:00
LineEditor Remove autoconf support 2016-01-26 21:29:08 +00:00
Linker Minor cleanup and documentation to IRMover (NFC) 2016-03-11 22:19:06 +00:00
LTO [ThinLTO] Support for reference graph in per-module and combined summary. 2016-03-11 18:52:24 +00:00
MC Don't crash when compiling inline assembler containing .file directives. 2016-03-09 17:32:56 +00:00
Object [ThinLTO] Support for reference graph in per-module and combined summary. 2016-03-11 18:52:24 +00:00
ObjectYAML [AMDGPU] add AMDGPU target support to ELFObjectFile.h header 2016-03-09 17:08:19 +00:00
Option Annotate dump() methods with LLVM_DUMP_METHOD, addressing Richard Smith r259192 post commit comment. 2016-01-29 20:50:44 +00:00
Passes [PM] Rename the CRTP mixin base classes for the new pass manager to 2016-03-11 10:33:22 +00:00
ProfileData Use LineLocation instead of CallsiteLocation to index callsite profile. 2016-03-03 18:09:32 +00:00
Support APFloat: Fix ilogb for denormals 2016-03-13 05:12:32 +00:00
TableGen [TableGen] Fix typos in comments. NFC 2016-02-26 06:50:27 +00:00
Target [SystemZ] Avoid LER on z13 due to partial register dependencies 2016-03-14 13:50:03 +00:00
Transforms [CVP] Replace nonnegative with positive, per Philip's request. NFC. 2016-03-14 13:48:00 +00:00
CMakeLists.txt Move ObjectYAML code to a new library. 2016-03-01 19:15:06 +00:00
LLVMBuild.txt Add LLVMBuild for ObjectYAML. 2016-03-01 21:29:33 +00:00