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[Kryo] Enable ZCZeroing feature 

This feature uses immediate #0 to zero a register.

Differential Revision: http://reviews.llvm.org/D19985

llvm-svn: 275143
This commit is contained in:
Haicheng Wu 2016-07-12 02:04:01 +00:00
parent 98226e3d93
commit 1e39574e9f
2 changed files with 32 additions and 23 deletions
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3
llvm/lib/Target/AArch64/AArch64.td
View File

@ -237,7 +237,8 @@ def ProcKryo : SubtargetFeature<"kryo", "ARMProcFamily", "Kryo",
FeatureNEON,
FeaturePerfMon,
FeaturePostRAScheduler,
FeaturePredictableSelectIsExpensive
FeaturePredictableSelectIsExpensive,
FeatureZCZeroing
]>;
def ProcVulcan : SubtargetFeature<"vulcan", "ARMProcFamily", "Vulcan",

52
llvm/test/CodeGen/AArch64/arm64-zero-cycle-zeroing.ll
View File

@ -1,44 +1,52 @@
; RUN: llc -mtriple=arm64-apple-ios -mcpu=cyclone < %s | FileCheck %s
; RUN: llc -mtriple=arm64-apple-ios -mcpu=cyclone < %s | FileCheck %s -check-prefix=CYCLONE --check-prefix=ALL
; RUN: llc -mtriple=aarch64-gnu-linux -mcpu=kryo < %s | FileCheck %s -check-prefix=KRYO --check-prefix=ALL
; rdar://11481771
; rdar://13713797
define void @t1() nounwind ssp {
entry:
; CHECK-LABEL: t1:
; CHECK-NOT: fmov
; CHECK: movi.2d v0, #0000000000000000
; CHECK: movi.2d v1, #0000000000000000
; CHECK: movi.2d v2, #0000000000000000
; CHECK: movi.2d v3, #0000000000000000
; ALL-LABEL: t1:
; ALL-NOT: fmov
; CYCLONE: movi.2d v0, #0000000000000000
; CYCLONE: movi.2d v1, #0000000000000000
; CYCLONE: movi.2d v2, #0000000000000000
; CYCLONE: movi.2d v3, #0000000000000000
; KRYO: movi v0.2d, #0000000000000000
; KRYO: mov v1.16b, v0.16b
; KRYO: mov v2.16b, v0.16b
; KRYO: mov v3.16b, v0.16b
tail call void @bar(double 0.000000e+00, double 0.000000e+00, double 0.000000e+00, double 0.000000e+00) nounwind
ret void
}
define void @t2() nounwind ssp {
entry:
; CHECK-LABEL: t2:
; CHECK-NOT: mov w0, wzr
; CHECK: mov w0, #0
; CHECK: mov w1, #0
; ALL-LABEL: t2:
; ALL-NOT: mov w0, wzr
; ALL: mov w0, #0
; ALL: mov w1, #0
tail call void @bari(i32 0, i32 0) nounwind
ret void
}
define void @t3() nounwind ssp {
entry:
; CHECK-LABEL: t3:
; CHECK-NOT: mov x0, xzr
; CHECK: mov x0, #0
; CHECK: mov x1, #0
; ALL-LABEL: t3:
; ALL-NOT: mov x0, xzr
; ALL: mov x0, #0
; ALL: mov x1, #0
tail call void @barl(i64 0, i64 0) nounwind
ret void
}
define void @t4() nounwind ssp {
; CHECK-LABEL: t4:
; CHECK-NOT: fmov
; CHECK: movi.2d v0, #0000000000000000
; CHECK: movi.2d v1, #0000000000000000
; ALL-LABEL: t4:
; ALL-NOT: fmov
; CYCLONE: movi.2d v0, #0000000000000000
; CYCLONE: movi.2d v1, #0000000000000000
; KRYO: movi v0.2d, #0000000000000000
; KRYO: mov v1.16b, v0.16b
tail call void @barf(float 0.000000e+00, float 0.000000e+00) nounwind
ret void
}
@ -50,9 +58,9 @@ declare void @barf(float, float)
; We used to produce spills+reloads for a Q register with zero cycle zeroing
; enabled.
; CHECK-LABEL: foo:
; CHECK-NOT: str {{q[0-9]+}}
; CHECK-NOT: ldr {{q[0-9]+}}
; ALL-LABEL: foo:
; ALL-NOT: str {{q[0-9]+}}
; ALL-NOT: ldr {{q[0-9]+}}
define double @foo(i32 %n) {
entry:
br label %for.body