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This patch adds alignment information for long double to the 64-bit PowerPC

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ELF subtarget.

The existing logic is used as a fallback to avoid any changes to the Darwin
ABI.  PPC64 ELF now has two possible data layout strings: one for FreeBSD,
which requires 8-byte alignment, and a default string that requires
16-byte alignment.

I've added a test for PPC64 Linux to verify the 16-byte alignment.  If
somebody wants to add a separate test for FreeBSD, that would be great.

Note that there is a companion patch to update the alignment information
in Clang, which I am committing now as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166928 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Schmidt 2012-10-29 14:59:36 +00:00
parent edece78550
commit 01d013ec04
2 changed files with 32 additions and 0 deletions
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6
lib/Target/PowerPC/PPCSubtarget.h
View File

@ -113,6 +113,12 @@ public:
const char *getDataLayoutString() const {
// Note, the alignment values for f64 and i64 on ppc64 in Darwin
// documentation are wrong; these are correct (i.e. "what gcc does").
if (isPPC64() && isSVR4ABI())
if (TargetTriple.getOS() == llvm::Triple::FreeBSD)
return "E-p:64:64-f64:64:64-i64:64:64-f128:64:64-v128:128:128-n32:64";
else
return "E-p:64:64-f64:64:64-i64:64:64-f128:128:128-v128:128:128-n32:64";
return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
: "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32";
}

26
test/CodeGen/PowerPC/ppc64-align-long-double.ll Normal file
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@ -0,0 +1,26 @@
; RUN: llc -mcpu=pwr7 -O0 < %s | FileCheck %s
; Verify internal alignment of long double in a struct. The double
; argument comes in in GPR3; GPR4 is skipped; GPRs 5 and 6 contain
; the long double. Check that these are stored to proper locations
; in the parameter save area and loaded from there for return in FPR1/2.
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
%struct.S = type { double, ppc_fp128 }
define ppc_fp128 @test(%struct.S* byval %x) nounwind {
entry:
%b = getelementptr inbounds %struct.S* %x, i32 0, i32 1
%0 = load ppc_fp128* %b, align 16
ret ppc_fp128 %0
}
; CHECK: std 6, 72(1)
; CHECK: std 5, 64(1)
; CHECK: std 4, 56(1)
; CHECK: std 3, 48(1)
; CHECK: lfd 1, 64(1)
; CHECK: lfd 2, 72(1)