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c9ce27d6b7
with SUBREG_TO_REG, teach SimpleRegisterCoalescing to coalesce SUBREG_TO_REG instructions (which are similar to INSERT_SUBREG instructions), and teach the DAGCombiner to take advantage of this on targets which support it. This eliminates many redundant zero-extension operations on x86-64. This adds a new TargetLowering hook, isZExtFree. It's similar to isTruncateFree, except it only applies to actual definitions, and not no-op truncates which may not zero the high bits. Also, this adds a new optimization to SimplifyDemandedBits: transform operations like x+y into (zext (add (trunc x), (trunc y))) on targets where all the casts are no-ops. In contexts where the high part of the add is explicitly masked off, this allows the mask operation to be eliminated. Fix the DAGCombiner to avoid undoing these transformations to eliminate casts on targets where the casts are no-ops. Also, this adds a new two-address lowering heuristic. Since two-address lowering runs before coalescing, it helps to be able to look through copies when deciding whether commuting and/or three-address conversion are profitable. Also, fix a bug in LiveInterval::MergeInClobberRanges. It didn't handle the case that a clobber range extended both before and beyond an existing live range. In that case, multiple live ranges need to be added. This was exposed by the new subreg coalescing code. Remove 2008-05-06-SpillerBug.ll. It was bugpoint-reduced, and the spiller behavior it was looking for no longer occurrs with the new instruction selection. llvm-svn: 68576
136 lines
3.3 KiB
LLVM
136 lines
3.3 KiB
LLVM
; RUN: llvm-as < %s | llc -march=x86-64 > %t
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; RUN: not grep leaq %t
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; RUN: not grep incq %t
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; RUN: not grep decq %t
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; RUN: not grep negq %t
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; RUN: not grep addq %t
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; RUN: not grep subq %t
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; RUN: not grep {movl %} %t
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; Utilize implicit zero-extension on x86-64 to eliminate explicit
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; zero-extensions. Shrink 64-bit adds to 32-bit when the high
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; 32-bits will be zeroed.
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define void @bar(i64 %x, i64 %y, i64* %z) nounwind readnone {
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entry:
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%t0 = add i64 %x, %y
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%t1 = and i64 %t0, 4294967295
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store i64 %t1, i64* %z
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ret void
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}
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define void @easy(i32 %x, i32 %y, i64* %z) nounwind readnone {
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entry:
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%t0 = add i32 %x, %y
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%tn = zext i32 %t0 to i64
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%t1 = and i64 %tn, 4294967295
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store i64 %t1, i64* %z
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ret void
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}
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define void @cola(i64 *%x, i64 %y, i64* %z, i64 %u) nounwind readnone {
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entry:
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%p = load i64* %x
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%t0 = add i64 %p, %y
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%t1 = and i64 %t0, 4294967295
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%t2 = xor i64 %t1, %u
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store i64 %t2, i64* %z
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ret void
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}
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define void @yaks(i64 *%x, i64 %y, i64* %z, i64 %u) nounwind readnone {
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entry:
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%p = load i64* %x
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%t0 = add i64 %p, %y
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%t1 = xor i64 %t0, %u
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%t2 = and i64 %t1, 4294967295
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store i64 %t2, i64* %z
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ret void
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}
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define void @foo(i64 *%x, i64 *%y, i64* %z) nounwind readnone {
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entry:
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%a = load i64* %x
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%b = load i64* %y
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%t0 = add i64 %a, %b
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%t1 = and i64 %t0, 4294967295
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store i64 %t1, i64* %z
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ret void
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}
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define void @avo(i64 %x, i64* %z, i64 %u) nounwind readnone {
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entry:
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%t0 = add i64 %x, 734847
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%t1 = and i64 %t0, 4294967295
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%t2 = xor i64 %t1, %u
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store i64 %t2, i64* %z
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ret void
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}
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define void @phe(i64 %x, i64* %z, i64 %u) nounwind readnone {
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entry:
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%t0 = add i64 %x, 734847
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%t1 = xor i64 %t0, %u
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%t2 = and i64 %t1, 4294967295
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store i64 %t2, i64* %z
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ret void
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}
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define void @oze(i64 %y, i64* %z) nounwind readnone {
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entry:
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%t0 = add i64 %y, 1
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%t1 = and i64 %t0, 4294967295
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store i64 %t1, i64* %z
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ret void
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}
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define void @sbar(i64 %x, i64 %y, i64* %z) nounwind readnone {
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entry:
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%t0 = sub i64 %x, %y
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%t1 = and i64 %t0, 4294967295
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store i64 %t1, i64* %z
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ret void
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}
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define void @seasy(i32 %x, i32 %y, i64* %z) nounwind readnone {
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entry:
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%t0 = sub i32 %x, %y
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%tn = zext i32 %t0 to i64
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%t1 = and i64 %tn, 4294967295
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store i64 %t1, i64* %z
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ret void
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}
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define void @scola(i64 *%x, i64 %y, i64* %z, i64 %u) nounwind readnone {
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entry:
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%p = load i64* %x
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%t0 = sub i64 %p, %y
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%t1 = and i64 %t0, 4294967295
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%t2 = xor i64 %t1, %u
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store i64 %t2, i64* %z
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ret void
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}
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define void @syaks(i64 *%x, i64 %y, i64* %z, i64 %u) nounwind readnone {
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entry:
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%p = load i64* %x
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%t0 = sub i64 %p, %y
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%t1 = xor i64 %t0, %u
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%t2 = and i64 %t1, 4294967295
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store i64 %t2, i64* %z
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ret void
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}
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define void @sfoo(i64 *%x, i64 *%y, i64* %z) nounwind readnone {
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entry:
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%a = load i64* %x
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%b = load i64* %y
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%t0 = sub i64 %a, %b
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%t1 = and i64 %t0, 4294967295
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store i64 %t1, i64* %z
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ret void
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}
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define void @swya(i64 %y, i64* %z) nounwind readnone {
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entry:
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%t0 = sub i64 0, %y
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%t1 = and i64 %t0, 4294967295
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store i64 %t1, i64* %z
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ret void
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}
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define void @soze(i64 %y, i64* %z) nounwind readnone {
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entry:
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%t0 = sub i64 %y, 1
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%t1 = and i64 %t0, 4294967295
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store i64 %t1, i64* %z
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ret void
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}
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