6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-24 22:24:54 +00:00
Code Issues Projects Releases Wiki Activity

[SystemZ] Fold more spills

Browse Source 
Add a mapping from register-based <INSN>R instructions to the corresponding
memory-based <INSN>.  Use it to cut down on the number of spill loads.

Some instructions extend their operands from smaller fields, so this
required a new TSFlags field to say how big the unextended operand is.

This optimisation doesn't trigger for C(G)R and CL(G)R because in practice
we always combine those instructions with a branch.  Adding a test for every
other case probably seems excessive, but it did catch a missed optimisation
for DSGF (fixed in r185435).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185529 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Sandiford
2013-07-03 10:10:02 +00:00
parent b81b477cd4
commit fa487e83a8
60 changed files with 4023 additions and 251 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
test/CodeGen/SystemZ/or-01.ll
View File

@@ -2,6 +2,8 @@
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
declare i32 @foo()
; Check OR.
define i32 @f1(i32 %a, i32 %b) {
; CHECK: f1:
@@ -127,3 +129,46 @@ define i32 @f11(i32 %a, i64 %src, i64 %index) {
%or = or i32 %a, %b
ret i32 %or
}
; Check that ORs of spilled values can use O rather than OR.
define i32 @f12(i32 *%ptr0) {
; CHECK: f12:
; CHECK: brasl %r14, foo@PLT
; CHECK: o %r2, 16{{[04]}}(%r15)
; CHECK: br %r14
%ptr1 = getelementptr i32 *%ptr0, i64 2
%ptr2 = getelementptr i32 *%ptr0, i64 4
%ptr3 = getelementptr i32 *%ptr0, i64 6
%ptr4 = getelementptr i32 *%ptr0, i64 8
%ptr5 = getelementptr i32 *%ptr0, i64 10
%ptr6 = getelementptr i32 *%ptr0, i64 12
%ptr7 = getelementptr i32 *%ptr0, i64 14
%ptr8 = getelementptr i32 *%ptr0, i64 16
%ptr9 = getelementptr i32 *%ptr0, i64 18
%val0 = load i32 *%ptr0
%val1 = load i32 *%ptr1
%val2 = load i32 *%ptr2
%val3 = load i32 *%ptr3
%val4 = load i32 *%ptr4
%val5 = load i32 *%ptr5
%val6 = load i32 *%ptr6
%val7 = load i32 *%ptr7
%val8 = load i32 *%ptr8
%val9 = load i32 *%ptr9
%ret = call i32 @foo()
%or0 = or i32 %ret, %val0
%or1 = or i32 %or0, %val1
%or2 = or i32 %or1, %val2
%or3 = or i32 %or2, %val3
%or4 = or i32 %or3, %val4
%or5 = or i32 %or4, %val5
%or6 = or i32 %or5, %val6
%or7 = or i32 %or6, %val7
%or8 = or i32 %or7, %val8
%or9 = or i32 %or8, %val9
ret i32 %or9
}