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https://github.com/c64scene-ar/llvm-6502.git
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fa487e83a8
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
120 lines
3.1 KiB
LLVM
120 lines
3.1 KiB
LLVM
; Test 32-bit floating-point subtraction.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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declare float @foo()
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; Check register subtraction.
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define float @f1(float %f1, float %f2) {
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; CHECK: f1:
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; CHECK: sebr %f0, %f2
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; CHECK: br %r14
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%res = fsub float %f1, %f2
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ret float %res
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}
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; Check the low end of the SEB range.
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define float @f2(float %f1, float *%ptr) {
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; CHECK: f2:
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; CHECK: seb %f0, 0(%r2)
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; CHECK: br %r14
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%f2 = load float *%ptr
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%res = fsub float %f1, %f2
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ret float %res
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}
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; Check the high end of the aligned SEB range.
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define float @f3(float %f1, float *%base) {
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; CHECK: f3:
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; CHECK: seb %f0, 4092(%r2)
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; CHECK: br %r14
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%ptr = getelementptr float *%base, i64 1023
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%f2 = load float *%ptr
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%res = fsub float %f1, %f2
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ret float %res
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}
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; Check the next word up, which needs separate address logic.
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; Other sequences besides this one would be OK.
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define float @f4(float %f1, float *%base) {
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; CHECK: f4:
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; CHECK: aghi %r2, 4096
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; CHECK: seb %f0, 0(%r2)
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; CHECK: br %r14
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%ptr = getelementptr float *%base, i64 1024
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%f2 = load float *%ptr
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%res = fsub float %f1, %f2
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ret float %res
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}
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; Check negative displacements, which also need separate address logic.
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define float @f5(float %f1, float *%base) {
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; CHECK: f5:
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; CHECK: aghi %r2, -4
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; CHECK: seb %f0, 0(%r2)
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; CHECK: br %r14
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%ptr = getelementptr float *%base, i64 -1
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%f2 = load float *%ptr
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%res = fsub float %f1, %f2
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ret float %res
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}
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; Check that SEB allows indices.
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define float @f6(float %f1, float *%base, i64 %index) {
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; CHECK: f6:
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; CHECK: sllg %r1, %r3, 2
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; CHECK: seb %f0, 400(%r1,%r2)
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; CHECK: br %r14
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%ptr1 = getelementptr float *%base, i64 %index
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%ptr2 = getelementptr float *%ptr1, i64 100
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%f2 = load float *%ptr2
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%res = fsub float %f1, %f2
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ret float %res
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}
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; Check that subtractions of spilled values can use SEB rather than SEBR.
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define float @f7(float *%ptr0) {
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; CHECK: f7:
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; CHECK: brasl %r14, foo@PLT
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; CHECK: seb %f0, 16{{[04]}}(%r15)
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; CHECK: br %r14
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%ptr1 = getelementptr float *%ptr0, i64 2
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%ptr2 = getelementptr float *%ptr0, i64 4
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%ptr3 = getelementptr float *%ptr0, i64 6
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%ptr4 = getelementptr float *%ptr0, i64 8
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%ptr5 = getelementptr float *%ptr0, i64 10
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%ptr6 = getelementptr float *%ptr0, i64 12
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%ptr7 = getelementptr float *%ptr0, i64 14
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%ptr8 = getelementptr float *%ptr0, i64 16
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%ptr9 = getelementptr float *%ptr0, i64 18
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%ptr10 = getelementptr float *%ptr0, i64 20
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%val0 = load float *%ptr0
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%val1 = load float *%ptr1
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%val2 = load float *%ptr2
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%val3 = load float *%ptr3
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%val4 = load float *%ptr4
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%val5 = load float *%ptr5
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%val6 = load float *%ptr6
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%val7 = load float *%ptr7
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%val8 = load float *%ptr8
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%val9 = load float *%ptr9
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%val10 = load float *%ptr10
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%ret = call float @foo()
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%sub0 = fsub float %ret, %val0
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%sub1 = fsub float %sub0, %val1
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%sub2 = fsub float %sub1, %val2
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%sub3 = fsub float %sub2, %val3
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%sub4 = fsub float %sub3, %val4
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%sub5 = fsub float %sub4, %val5
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%sub6 = fsub float %sub5, %val6
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%sub7 = fsub float %sub6, %val7
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%sub8 = fsub float %sub7, %val8
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%sub9 = fsub float %sub8, %val9
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%sub10 = fsub float %sub9, %val10
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ret float %sub10
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}
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