llvm.org GIT mirror llvm / 01d013e
This patch adds alignment information for long double to the 64-bit PowerPC 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 Bill Schmidt 7 years ago
2 changed file(s) with 32 addition(s) and 0 deletion(s). Raw diff Collapse all Expand all
112112 const char *getDataLayoutString() const {
113113 // Note, the alignment values for f64 and i64 on ppc64 in Darwin
114114 // documentation are wrong; these are correct (i.e. "what gcc does").
115 if (isPPC64() && isSVR4ABI())
116 if (TargetTriple.getOS() == llvm::Triple::FreeBSD)
117 return "E-p:64:64-f64:64:64-i64:64:64-f128:64:64-v128:128:128-n32:64";
118 else
119 return "E-p:64:64-f64:64:64-i64:64:64-f128:128:128-v128:128:128-n32:64";
120
115121 return isPPC64() ? "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
116122 : "E-p:32:32-f64:64:64-i64:64:64-f128:64:128-n32";
117123 }
0 ; RUN: llc -mcpu=pwr7 -O0 < %s | FileCheck %s
1
2 ; Verify internal alignment of long double in a struct. The double
3 ; argument comes in in GPR3; GPR4 is skipped; GPRs 5 and 6 contain
4 ; the long double. Check that these are stored to proper locations
5 ; in the parameter save area and loaded from there for return in FPR1/2.
6
7 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"
8 target triple = "powerpc64-unknown-linux-gnu"
9
10 %struct.S = type { double, ppc_fp128 }
11
12 define ppc_fp128 @test(%struct.S* byval %x) nounwind {
13 entry:
14 %b = getelementptr inbounds %struct.S* %x, i32 0, i32 1
15 %0 = load ppc_fp128* %b, align 16
16 ret ppc_fp128 %0
17 }
18
19 ; CHECK: std 6, 72(1)
20 ; CHECK: std 5, 64(1)
21 ; CHECK: std 4, 56(1)
22 ; CHECK: std 3, 48(1)
23 ; CHECK: lfd 1, 64(1)
24 ; CHECK: lfd 2, 72(1)
25