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[SystemZ] Fold more spills

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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
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45
test/CodeGen/SystemZ/int-add-05.ll
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@@ -2,6 +2,8 @@
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
declare i64 @foo()
; Check AGR.
define i64 @f1(i64 %a, i64 %b) {
; CHECK: f1:
@@ -92,3 +94,46 @@ define i64 @f8(i64 %a, i64 %src, i64 %index) {
%add = add i64 %a, %b
ret i64 %add
}
; Check that additions of spilled values can use AG rather than AGR.
define i64 @f9(i64 *%ptr0) {
; CHECK: f9:
; CHECK: brasl %r14, foo@PLT
; CHECK: ag %r2, 160(%r15)
; CHECK: br %r14
%ptr1 = getelementptr i64 *%ptr0, i64 2
%ptr2 = getelementptr i64 *%ptr0, i64 4
%ptr3 = getelementptr i64 *%ptr0, i64 6
%ptr4 = getelementptr i64 *%ptr0, i64 8
%ptr5 = getelementptr i64 *%ptr0, i64 10
%ptr6 = getelementptr i64 *%ptr0, i64 12
%ptr7 = getelementptr i64 *%ptr0, i64 14
%ptr8 = getelementptr i64 *%ptr0, i64 16
%ptr9 = getelementptr i64 *%ptr0, i64 18
%val0 = load i64 *%ptr0
%val1 = load i64 *%ptr1
%val2 = load i64 *%ptr2
%val3 = load i64 *%ptr3
%val4 = load i64 *%ptr4
%val5 = load i64 *%ptr5
%val6 = load i64 *%ptr6
%val7 = load i64 *%ptr7
%val8 = load i64 *%ptr8
%val9 = load i64 *%ptr9
%ret = call i64 @foo()
%add0 = add i64 %ret, %val0
%add1 = add i64 %add0, %val1
%add2 = add i64 %add1, %val2
%add3 = add i64 %add2, %val3
%add4 = add i64 %add3, %val4
%add5 = add i64 %add4, %val5
%add6 = add i64 %add5, %val6
%add7 = add i64 %add6, %val7
%add8 = add i64 %add7, %val8
%add9 = add i64 %add8, %val9
ret i64 %add9
}