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author | Venkatraman Govindaraju <venkatra@cs.wisc.edu> | 2013-06-01 04:51:18 +0000 |
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committer | Venkatraman Govindaraju <venkatra@cs.wisc.edu> | 2013-06-01 04:51:18 +0000 |
commit | 72ad17c48c15562fe31c65f6daa09c83f42860c1 (patch) | |
tree | 90c980de9939263feabe0c7dbb71b87247516b33 /lib/Target/Sparc/SparcSubtarget.cpp | |
parent | 2e2922cd90922eaf3736421bd0ad4331f89f3e75 (diff) | |
download | llvm-72ad17c48c15562fe31c65f6daa09c83f42860c1.tar.gz llvm-72ad17c48c15562fe31c65f6daa09c83f42860c1.tar.bz2 llvm-72ad17c48c15562fe31c65f6daa09c83f42860c1.tar.xz |
[Sparc] Generate correct code for leaf functions with stack objects
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183067 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/Sparc/SparcSubtarget.cpp')
-rw-r--r-- | lib/Target/Sparc/SparcSubtarget.cpp | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/Target/Sparc/SparcSubtarget.cpp b/lib/Target/Sparc/SparcSubtarget.cpp index e5b2aeb1bb..ba129ec926 100644 --- a/lib/Target/Sparc/SparcSubtarget.cpp +++ b/lib/Target/Sparc/SparcSubtarget.cpp @@ -13,6 +13,7 @@ #include "SparcSubtarget.h" #include "Sparc.h" +#include "llvm/Support/MathExtras.h" #include "llvm/Support/TargetRegistry.h" #define GET_SUBTARGETINFO_TARGET_DESC @@ -44,3 +45,30 @@ SparcSubtarget::SparcSubtarget(const std::string &TT, const std::string &CPU, // Parse features string. ParseSubtargetFeatures(CPUName, FS); } + + +int SparcSubtarget::getAdjustedFrameSize(int frameSize) const { + + if (is64Bit()) { + // All 64-bit stack frames must be 16-byte aligned, and must reserve space + // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128. + frameSize += 128; + // Frames with calls must also reserve space for 6 outgoing arguments + // whether they are used or not. LowerCall_64 takes care of that. + assert(frameSize % 16 == 0 && "Stack size not 16-byte aligned"); + } else { + // Emit the correct save instruction based on the number of bytes in + // the frame. Minimum stack frame size according to V8 ABI is: + // 16 words for register window spill + // 1 word for address of returned aggregate-value + // + 6 words for passing parameters on the stack + // ---------- + // 23 words * 4 bytes per word = 92 bytes + frameSize += 92; + + // Round up to next doubleword boundary -- a double-word boundary + // is required by the ABI. + frameSize = RoundUpToAlignment(frameSize, 8); + } + return frameSize; +} |