From 30cbccb029b01738202bd04341b1cbf68a7814c9 Mon Sep 17 00:00:00 2001 From: Hal Finkel Date: Mon, 19 Aug 2013 23:35:24 +0000 Subject: Don't form PPC CTR-based loops around a copysignl call copysign/copysignf never become function calls (because the SDAG expansion code does not lower to the corresponding function call, but rather directly implements the associated logic), but copysignl almost always is lowered into a call to the requested libm functon (and, thus, might clobber CTR). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188727 91177308-0d34-0410-b5e6-96231b3b80d8 --- test/CodeGen/PowerPC/ctrloop-cpsgn.ll | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 test/CodeGen/PowerPC/ctrloop-cpsgn.ll (limited to 'test/CodeGen/PowerPC') diff --git a/test/CodeGen/PowerPC/ctrloop-cpsgn.ll b/test/CodeGen/PowerPC/ctrloop-cpsgn.ll new file mode 100644 index 0000000..2f04409 --- /dev/null +++ b/test/CodeGen/PowerPC/ctrloop-cpsgn.ll @@ -0,0 +1,28 @@ +; RUN: llc < %s -mcpu=ppc | FileCheck %s + +target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32" +target triple = "powerpc-unknown-linux-gnu" + +define ppc_fp128 @foo(ppc_fp128* nocapture %n, ppc_fp128 %d) nounwind readonly { +entry: + br label %for.body + +for.body: ; preds = %for.body, %entry + %i.06 = phi i32 [ 0, %entry ], [ %inc, %for.body ] + %x.05 = phi ppc_fp128 [ %d, %entry ], [ %conv, %for.body ] + %arrayidx = getelementptr inbounds ppc_fp128* %n, i32 %i.06 + %0 = load ppc_fp128* %arrayidx, align 8 + %conv = tail call ppc_fp128 @copysignl(ppc_fp128 %x.05, ppc_fp128 %d) nounwind readonly + %inc = add nsw i32 %i.06, 1 + %exitcond = icmp eq i32 %inc, 2048 + br i1 %exitcond, label %for.end, label %for.body + +for.end: ; preds = %for.body + ret ppc_fp128 %conv +} + +declare ppc_fp128 @copysignl(ppc_fp128, ppc_fp128) #0 + +; CHECK: @foo +; CHECK-NOT: mtctr + -- cgit v1.1