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author | Richard Sandiford <rsandifo@linux.vnet.ibm.com> | 2013-07-03 10:10:02 +0000 |
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committer | Richard Sandiford <rsandifo@linux.vnet.ibm.com> | 2013-07-03 10:10:02 +0000 |
commit | fa487e83a83c260d6a50f3df00a0eb012553a912 (patch) | |
tree | f6ddd72df044eaa9cabbce37fd4b04f64b978139 /test/CodeGen/SystemZ/fp-add-02.ll | |
parent | b81b477cd4392a51112c3af0659ea9fc176e74f1 (diff) | |
download | external_llvm-fa487e83a83c260d6a50f3df00a0eb012553a912.zip external_llvm-fa487e83a83c260d6a50f3df00a0eb012553a912.tar.gz external_llvm-fa487e83a83c260d6a50f3df00a0eb012553a912.tar.bz2 |
[SystemZ] Fold more spills
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
Diffstat (limited to 'test/CodeGen/SystemZ/fp-add-02.ll')
-rw-r--r-- | test/CodeGen/SystemZ/fp-add-02.ll | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/test/CodeGen/SystemZ/fp-add-02.ll b/test/CodeGen/SystemZ/fp-add-02.ll index 08eb90e..58afc13 100644 --- a/test/CodeGen/SystemZ/fp-add-02.ll +++ b/test/CodeGen/SystemZ/fp-add-02.ll @@ -2,6 +2,8 @@ ; ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s +declare double @foo() + ; Check register addition. define double @f1(double %f1, double %f2) { ; CHECK: f1: @@ -69,3 +71,49 @@ define double @f6(double %f1, double *%base, i64 %index) { %res = fadd double %f1, %f2 ret double %res } + +; Check that additions of spilled values can use ADB rather than ADBR. +define double @f7(double *%ptr0) { +; CHECK: f7: +; CHECK: brasl %r14, foo@PLT +; CHECK: adb %f0, 160(%r15) +; CHECK: br %r14 + %ptr1 = getelementptr double *%ptr0, i64 2 + %ptr2 = getelementptr double *%ptr0, i64 4 + %ptr3 = getelementptr double *%ptr0, i64 6 + %ptr4 = getelementptr double *%ptr0, i64 8 + %ptr5 = getelementptr double *%ptr0, i64 10 + %ptr6 = getelementptr double *%ptr0, i64 12 + %ptr7 = getelementptr double *%ptr0, i64 14 + %ptr8 = getelementptr double *%ptr0, i64 16 + %ptr9 = getelementptr double *%ptr0, i64 18 + %ptr10 = getelementptr double *%ptr0, i64 20 + + %val0 = load double *%ptr0 + %val1 = load double *%ptr1 + %val2 = load double *%ptr2 + %val3 = load double *%ptr3 + %val4 = load double *%ptr4 + %val5 = load double *%ptr5 + %val6 = load double *%ptr6 + %val7 = load double *%ptr7 + %val8 = load double *%ptr8 + %val9 = load double *%ptr9 + %val10 = load double *%ptr10 + + %ret = call double @foo() + + %add0 = fadd double %ret, %val0 + %add1 = fadd double %add0, %val1 + %add2 = fadd double %add1, %val2 + %add3 = fadd double %add2, %val3 + %add4 = fadd double %add3, %val4 + %add5 = fadd double %add4, %val5 + %add6 = fadd double %add5, %val6 + %add7 = fadd double %add6, %val7 + %add8 = fadd double %add7, %val8 + %add9 = fadd double %add8, %val9 + %add10 = fadd double %add9, %val10 + + ret double %add10 +} |