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https://github.com/c64scene-ar/llvm-6502.git
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6824f127f9
System z branches have a mask to select which of the 4 CC values should cause the branch to be taken. We can invert a branch by inverting the mask. However, not all instructions can produce all 4 CC values, so inverting the branch like this can lead to some oddities. For example, integer comparisons only produce a CC of 0 (equal), 1 (less) or 2 (greater). If an integer EQ is reversed to NE before instruction selection, the branch will test for 1 or 2. If instead the branch is reversed after instruction selection (by inverting the mask), it will test for 1, 2 or 3. Both are correct, but the second isn't really canonical. This patch therefore keeps track of which CC values are possible and uses this when inverting a mask. Although this is mostly cosmestic, it fixes undefined behavior for the CIJNLH in branch-08.ll. Another fix would have been to mask out bit 0 when generating the fused compare and branch, but the point of this patch is that we shouldn't need to do that in the first place. The patch also makes it easier to reuse CC results from other instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187495 91177308-0d34-0410-b5e6-96231b3b80d8
159 lines
3.9 KiB
LLVM
159 lines
3.9 KiB
LLVM
; Test 64-bit atomic ORs.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 | FileCheck %s
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; Check ORs of a variable.
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define i64 @f1(i64 %dummy, i64 *%src, i64 %b) {
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; CHECK-LABEL: f1:
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; CHECK: lg %r2, 0(%r3)
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; CHECK: [[LABEL:\.[^ ]*]]:
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; CHECK: lgr %r0, %r2
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; CHECK: ogr %r0, %r4
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; CHECK: csg %r2, %r0, 0(%r3)
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; CHECK: jl [[LABEL]]
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 %b seq_cst
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ret i64 %res
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}
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; Check the lowest useful OILL value.
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define i64 @f2(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f2:
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; CHECK: lg %r2, 0(%r3)
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; CHECK: [[LABEL:\.[^ ]*]]:
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; CHECK: lgr %r0, %r2
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; CHECK: oill %r0, 1
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; CHECK: csg %r2, %r0, 0(%r3)
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; CHECK: jl [[LABEL]]
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 1 seq_cst
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ret i64 %res
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}
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; Check the high end of the OILL range.
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define i64 @f3(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f3:
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; CHECK: oill %r0, 65535
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 65535 seq_cst
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ret i64 %res
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}
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; Check the lowest useful OILH value, which is the next value up.
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define i64 @f4(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f4:
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; CHECK: oilh %r0, 1
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 65536 seq_cst
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ret i64 %res
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}
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; Check the lowest useful OILF value, which is the next value up again.
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define i64 @f5(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f5:
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; CHECK: oilf %r0, 65537
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 65537 seq_cst
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ret i64 %res
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}
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; Check the high end of the OILH range.
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define i64 @f6(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f6:
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; CHECK: oilh %r0, 65535
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 4294901760 seq_cst
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ret i64 %res
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}
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; Check the next value up, which must use OILF.
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define i64 @f7(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f7:
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; CHECK: oilf %r0, 4294901761
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 4294901761 seq_cst
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ret i64 %res
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}
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; Check the high end of the OILF range.
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define i64 @f8(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f8:
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; CHECK: oilf %r0, 4294967295
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 4294967295 seq_cst
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ret i64 %res
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}
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; Check the lowest useful OIHL value, which is one greater than above.
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define i64 @f9(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f9:
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; CHECK: oihl %r0, 1
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 4294967296 seq_cst
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ret i64 %res
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}
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; Check the next value up, which must use a register. (We could use
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; combinations of OIH* and OIL* instead, but that isn't implemented.)
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define i64 @f10(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f10:
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; CHECK: ogr
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 4294967297 seq_cst
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ret i64 %res
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}
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; Check the high end of the OIHL range.
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define i64 @f11(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f11:
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; CHECK: oihl %r0, 65535
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 281470681743360 seq_cst
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ret i64 %res
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}
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; Check the lowest useful OIHH value, which is 1<<32 greater than above.
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define i64 @f12(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f12:
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; CHECK: oihh %r0, 1
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 281474976710656 seq_cst
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ret i64 %res
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}
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; Check the lowest useful OIHF value, which is 1<<32 greater again.
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define i64 @f13(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f13:
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; CHECK: oihf %r0, 65537
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 281479271677952 seq_cst
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ret i64 %res
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}
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; Check the high end of the OIHH range.
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define i64 @f14(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f14:
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; CHECK: oihh %r0, 65535
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 18446462598732840960 seq_cst
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ret i64 %res
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}
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; Check the next value up, which must use a register.
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define i64 @f15(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f15:
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; CHECK: ogr
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 18446462598732840961 seq_cst
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ret i64 %res
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}
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; Check the high end of the OIHF range.
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define i64 @f16(i64 %dummy, i64 *%src) {
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; CHECK-LABEL: f16:
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; CHECK: oihf %r0, 4294967295
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; CHECK: br %r14
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%res = atomicrmw or i64 *%src, i64 -4294967296 seq_cst
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ret i64 %res
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}
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