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Guard fabs to bfc convert with V6T2 flag 

Summary:
BFC instructions are available in ARMv6T2 and above.


Reviewers: t.p.northover

Subscribers: aemerson

Differential Revision: http://reviews.llvm.org/D16076

llvm-svn: 257546
This commit is contained in:
Ana Pazos 2016-01-13 00:03:35 +00:00
parent f8e3030794
commit 359cab3bb3
2 changed files with 16 additions and 2 deletions
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4
llvm/lib/Target/ARM/ARMInstrVFP.td
View File

@ -930,10 +930,10 @@ def VMOVDRR : AVConv5I<0b11000100, 0b1011,
// and could enable the conversion to float to be removed completely.
def : Pat<(fabs (arm_fmdrr GPR:$Rl, GPR:$Rh)),
(VMOVDRR GPR:$Rl, (BFC GPR:$Rh, (i32 0x7FFFFFFF)))>,
Requires<[IsARM]>;
Requires<[IsARM, HasV6T2]>;
def : Pat<(fabs (arm_fmdrr GPR:$Rl, GPR:$Rh)),
(VMOVDRR GPR:$Rl, (t2BFC GPR:$Rh, (i32 0x7FFFFFFF)))>,
Requires<[IsThumb2]>;
Requires<[IsThumb2, HasV6T2]>;
def : Pat<(fneg (arm_fmdrr GPR:$Rl, GPR:$Rh)),
(VMOVDRR GPR:$Rl, (EORri GPR:$Rh, (i32 0x80000000)))>,
Requires<[IsARM]>;

14
llvm/test/CodeGen/ARM/fabs-to-bfc.ll Normal file
View File

@ -0,0 +1,14 @@
; RUN: llc < %s -mtriple=armv5e-none-linux-gnueabi -mattr=+vfp2 | FileCheck %s -check-prefix=CHECK-VABS
; RUN: llc < %s -mtriple=armv7-none-linux-gnueabi -mattr=+vfp3 | FileCheck %s -check-prefix=CHECK-BFC
define double @test(double %tx) {
;CHECK-LABEL: test:
%call = tail call double @fabs(double %tx)
ret double %call
;CHECK-VABS: vabs.f64
;CHECK-BFC: bfc
}
declare double @fabs(double) readnone