maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[PowerPC] Disable the CTR optimization in the presence of {min,max}num 

The minnum and maxnum intrinsics get lowered to libcalls which
invalidates the CTR optimization.

This fixes PR27083.

llvm-svn: 264508
This commit is contained in:
David Majnemer 2016-03-26 09:42:31 +00:00
parent 9a5f19f509
commit b549ab02b4
2 changed files with 46 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
llvm/lib/Target/PowerPC/PPCCTRLoops.cpp
View File

@ -291,6 +291,8 @@ bool PPCCTRLoops::mightUseCTR(const Triple &TT, BasicBlock *BB) {
case Intrinsic::pow:
case Intrinsic::sin:
case Intrinsic::cos:
case Intrinsic::maxnum:
case Intrinsic::minnum:
return true;
case Intrinsic::copysign:
if (CI->getArgOperand(0)->getType()->getScalarType()->

44
llvm/test/CodeGen/PowerPC/ctr-minmaxnum.ll Normal file
View File

@ -0,0 +1,44 @@
; RUN: llc < %s | FileCheck %s
target triple = "powerpc64le-unknown-linux-gnu"
define void @test1(float %f, float* %fp) {
entry:
br label %loop_body
loop_body:
%invar_address.dim.0.01 = phi i64 [ 0, %entry ], [ %1, %loop_body ]
%0 = call float @llvm.minnum.f32(float %f, float 1.0)
store float %0, float* %fp, align 4
%1 = add i64 %invar_address.dim.0.01, 1
%2 = icmp eq i64 %1, 2
br i1 %2, label %loop_exit, label %loop_body
loop_exit:
ret void
}
; CHECK-LABEL: test1:
; CHECK: bl fminf
define void @test2(float %f, float* %fp) {
entry:
br label %loop_body
loop_body:
%invar_address.dim.0.01 = phi i64 [ 0, %entry ], [ %1, %loop_body ]
%0 = call float @llvm.maxnum.f32(float %f, float 1.0)
store float %0, float* %fp, align 4
%1 = add i64 %invar_address.dim.0.01, 1
%2 = icmp eq i64 %1, 2
br i1 %2, label %loop_exit, label %loop_body
loop_exit:
ret void
}
; CHECK-LABEL: test2:
; CHECK: bl fmaxf
declare float @llvm.minnum.f32(float, float)
declare float @llvm.maxnum.f32(float, float)