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PPC QPX requires a 32-byte aligned stack

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On systems which support the QPX vector instructions, the stack must be
32-byte aligned.

llvm-svn: 173993
This commit is contained in:
Hal Finkel 2013-01-30 23:43:27 +00:00
parent afbeb93c35
commit 32085870d7
3 changed files with 31 additions and 1 deletions
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3
lib/Target/PowerPC/PPCFrameLowering.h
View File

@ -27,7 +27,8 @@ class PPCFrameLowering: public TargetFrameLowering {
public:
PPCFrameLowering(const PPCSubtarget &sti)
: TargetFrameLowering(TargetFrameLowering::StackGrowsDown, 16, 0),
: TargetFrameLowering(TargetFrameLowering::StackGrowsDown,
(sti.hasQPX() || sti.isBGQ()) ? 32 : 16, 0),
Subtarget(sti) {
}

6
lib/Target/PowerPC/PPCSubtarget.cpp
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@ -83,6 +83,12 @@ PPCSubtarget::PPCSubtarget(const std::string &TT, const std::string &CPU,
// Set up darwin-specific properties.
if (isDarwin())
HasLazyResolverStubs = true;
// QPX requires a 32-byte aligned stack. Note that we need to do this if
// we're compiling for a BG/Q system regardless of whether or not QPX
// is enabled because external functions will assume this alignment.
if (hasQPX() || isBGQ())
StackAlignment = 32;
}
/// SetJITMode - This is called to inform the subtarget info that we are

23
test/CodeGen/PowerPC/a2q-stackalign.ll Normal file
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@ -0,0 +1,23 @@
; RUN: llc < %s -march=ppc64 -mcpu=a2 | FileCheck -check-prefix=CHECK-A2 %s
; RUN: llc < %s -march=ppc64 -mcpu=a2q | FileCheck -check-prefix=CHECK-A2Q %s
; RUN: llc < %s -march=ppc64 -mtriple=powerpc64-bgq-linux -mcpu=a2 | FileCheck -check-prefix=CHECK-BGQ %s
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"
declare i32 @bar(i8* %a) nounwind;
define i32 @foo() nounwind {
%p = alloca i8, i8 115
store i8 0, i8* %p
%r = call i32 @bar(i8* %p)
ret i32 %r
}
; Without QPX, the allocated stack frame is 240 bytes, but with QPX
; (because we require 32-byte alignment), it is 256 bytes.
; CHECK-A2: @foo
; CHECK-A2: stdu 1, -240(1)
; CHECK-A2Q: @foo
; CHECK-A2Q: stdu 1, -256(1)
; CHECK-BGQ: @foo
; CHECK-BGQ: stdu 1, -256(1)