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0c57babfc6
llvm/lib
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Ulrich Weigand 0c57babfc6 [PowerPC] Simplify and improve loading into TOC register 
During an indirect function call sequence on the 64-bit SVR4 ABI,
generate code must load and then restore the TOC register.

This does not use a regular LOAD instruction since the TOC
register r2 is marked as reserved.  Instead, the are two
special instruction patterns:

 let RST = 2, DS = 2 in
 def LDinto_toc: DSForm_1a<58, 0, (outs), (ins g8rc:$reg),
                     "ld 2, 8($reg)", IIC_LdStLD,
                     [(PPCload_toc i64:$reg)]>, isPPC64;
 
 let RST = 2, DS = 10, RA = 1 in
 def LDtoc_restore : DSForm_1a<58, 0, (outs), (ins),
                     "ld 2, 40(1)", IIC_LdStLD,
                     [(PPCtoc_restore)]>, isPPC64;

Note that these not only restrict the destination of the
load to r2, but they also restrict the *source* of the
load to particular address combinations.  The latter is
a problem when we want to support the ELFv2 ABI, since
there the TOC save slot is no longer at 40(1).

This patch replaces those two instructions with a single
instruction pattern that only hard-codes r2 as destination,
but supports generic addresses as source.  This will allow
supporting the ELFv2 ABI, and also helps generate more
efficient code for calls to absolute addresses (allowing
simplification of the ppc64-calls.ll test case).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211193 91177308-0d34-0410-b5e6-96231b3b80d8
2014-06-18 17:52:49 +00:00
..
Analysis Removing an "if (!this)" check from two print methods. The condition will 2014-06-09 22:53:16 +00:00
AsmParser IR: add "cmpxchg weak" variant to support permitted failure. 2014-06-13 14:24:07 +00:00
Bitcode Replace some assert(0)'s with llvm_unreachable. 2014-06-18 05:05:13 +00:00
CodeGen DAG: move sret demotion into most basic LowerCallTo implementation. 2014-06-18 11:52:44 +00:00
DebugInfo [DWARF parser] Use distinction between DW_AT_ranges_base and DW_AT_GNU_ranges_base instead of DWARF version 2014-06-13 22:31:03 +00:00
ExecutionEngine Remove more occurrences of the unused-mutex-parameter pattern. 2014-06-17 21:54:18 +00:00
IR Revert "Random Number Generator (llvm)" 2014-06-18 06:33:23 +00:00
IRReader Remove 'using std::errro_code' from lib. 2014-06-13 02:24:39 +00:00
LineEditor
Linker Replace some assert(0)'s with llvm_unreachable. 2014-06-18 05:05:13 +00:00
LTO Remove 'using std::errro_code' from lib. 2014-06-13 02:24:39 +00:00
MC Using llvm::sys::swapByteOrder() for the common case of byte-swapping a value in place 2014-06-14 13:18:07 +00:00
Object Fix a memory leak in the error path. 2014-06-18 17:07:15 +00:00
Option Options: Use erase_if to remove Args from the list. 2014-05-18 15:14:13 +00:00
ProfileData Renaming SwapByteOrder() to getSwappedBytes() 2014-06-14 11:36:01 +00:00
Support Revert "Random Number Generator (llvm)" 2014-06-18 06:33:23 +00:00
TableGen Move SetTheory from utils/TableGen into lib/TableGen so Clang can use it. 2014-06-17 13:10:38 +00:00
Target [PowerPC] Simplify and improve loading into TOC register 2014-06-18 17:52:49 +00:00
Transforms [msan] Handle X86 *.psad.* and *.pmadd.* intrinsics. 2014-06-18 12:02:29 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile