mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-21 20:12:56 +02:00
f34d1f0dc5
Summary: r255334 matches bit-reverse pattern in InstCombine and generates calls to Instrinsic::bitreverse. RBIT instruction is only available for ARMv6t2 and above. This patch has the intrinsic expanded during legalization for ARMv4 and ARMv5. Patch by Z. Zheng <zhaoshiz@codeaurora.org> Reviewers: apazos, jmolloy, weimingz Subscribers: aemerson, rengolin, llvm-commits Differential Revision: http://reviews.llvm.org/D15932 llvm-svn: 257188
35 lines
1.2 KiB
LLVM
35 lines
1.2 KiB
LLVM
;RUN: opt -instcombine -S < %s | llc -mtriple=armv5e--linux-gnueabi | FileCheck %s
|
|
;RUN: opt -instcombine -S < %s | llc -mtriple=thumbv4t--linux-gnueabi | FileCheck %s
|
|
;RUN: opt -instcombine -S < %s | llc -mtriple=armv6--linux-gnueabi | FileCheck %s
|
|
|
|
;RUN: opt -instcombine -S < %s | llc -mtriple=armv7--linux-gnueabi | FileCheck %s --check-prefix=RBIT
|
|
;RUN: opt -instcombine -S < %s | llc -mtriple=thumbv8--linux-gnueabi | FileCheck %s --check-prefix=RBIT
|
|
|
|
;CHECK-NOT: rbit
|
|
;RBIT: rbit
|
|
|
|
define void @byte_reversal(i8* %p, i32 %n) {
|
|
entry:
|
|
br label %for.cond
|
|
|
|
for.cond: ; preds = %for.body, %entry
|
|
%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
|
|
%cmp = icmp ult i32 %i.0, %n
|
|
br i1 %cmp, label %for.body, label %for.end
|
|
|
|
for.body: ; preds = %for.cond
|
|
%0 = sext i32 %i.0 to i64
|
|
%arrayidx = getelementptr inbounds i8, i8* %p, i64 %0
|
|
%1 = load i8, i8* %arrayidx, align 1
|
|
%or19 = call i8 @llvm.bitreverse.i8(i8 %1)
|
|
store i8 %or19, i8* %arrayidx, align 1
|
|
%inc = add i32 %i.0, 1
|
|
br label %for.cond
|
|
|
|
for.end: ; preds = %for.cond
|
|
ret void
|
|
}
|
|
|
|
; Function Attrs: nounwind readnone
|
|
declare i8 @llvm.bitreverse.i8(i8)
|