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ComputeKnownBits: be a bit smarter about ADDs

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If our two inputs have known top-zero bit counts M and N, we trivially
know that the output cannot have any bits set in the top (min(M, N)-1)
bits, since nothing could carry past that point.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241927 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Fiona Glaser
2015-07-10 18:29:02 +00:00
parent 02e89ace70
commit b0a2d8c5a5
3 changed files with 22 additions and 12 deletions
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10
test/CodeGen/AArch64/aarch64-dynamic-stack-layout.ll
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@@ -255,7 +255,7 @@ entry:
; CHECK: ubfx x9, x0, #0, #32
; CHECK: lsl x9, x9, #2
; CHECK: add x9, x9, #15
; CHECK: and x9, x9, #0xfffffffffffffff0
; CHECK: and x9, x9, #0x7fffffff0
; CHECK: mov x10, sp
; CHECK: sub x[[VLASPTMP:[0-9]+]], x10, x9
; CHECK: mov sp, x[[VLASPTMP]]
@@ -302,7 +302,7 @@ entry:
; CHECK: ubfx x9, x0, #0, #32
; CHECK: lsl x9, x9, #2
; CHECK: add x9, x9, #15
; CHECK: and x9, x9, #0xfffffffffffffff0
; CHECK: and x9, x9, #0x7fffffff0
; CHECK: mov x10, sp
; CHECK: sub x[[VLASPTMP:[0-9]+]], x10, x9
; CHECK: mov sp, x[[VLASPTMP]]
@@ -364,7 +364,7 @@ entry:
; CHECK: ubfx x9, x0, #0, #32
; CHECK: lsl x9, x9, #2
; CHECK: add x9, x9, #15
; CHECK: and x9, x9, #0xfffffffffffffff0
; CHECK: and x9, x9, #0x7fffffff0
; CHECK: mov x10, sp
; CHECK: sub x[[VLASPTMP:[0-9]+]], x10, x9
; CHECK: mov sp, x[[VLASPTMP]]
@@ -417,7 +417,7 @@ entry:
; CHECK: ubfx x9, x0, #0, #32
; CHECK: lsl x9, x9, #2
; CHECK: add x9, x9, #15
; CHECK: and x9, x9, #0xfffffffffffffff0
; CHECK: and x9, x9, #0x7fffffff0
; CHECK: mov x10, sp
; CHECK: sub x[[VLASPTMP:[0-9]+]], x10, x9
; CHECK: mov sp, x[[VLASPTMP]]
@@ -468,7 +468,7 @@ entry:
; CHECK: ubfx x9, x0, #0, #32
; CHECK: lsl x9, x9, #2
; CHECK: add x9, x9, #15
; CHECK: and x9, x9, #0xfffffffffffffff0
; CHECK: and x9, x9, #0x7fffffff0
; CHECK: mov x10, sp
; CHECK: sub x[[VLASPTMP:[0-9]+]], x10, x9
; CHECK: mov sp, x[[VLASPTMP]]