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Explain why layout prefers 32 for small types on Thumb. 

llvm-svn: 128850
This commit is contained in:
Sandeep Patel 2011-04-04 22:58:12 +00:00
parent 3657c006cc
commit f87b3739cc
1 changed files with 4 additions and 0 deletions
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4
clang/lib/Basic/Targets.cpp
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@ -1729,6 +1729,8 @@ public:
// FIXME: Should we just treat this as a feature?
IsThumb = getTriple().getArchName().startswith("thumb");
if (IsThumb) {
// Thumb1 add sp, #imm requires the immediate value be multiple of 4,
// so set preferred for small types to 32.
DescriptionString = ("e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-"
"i64:64:64-f32:32:32-f64:64:64-"
"v64:64:64-v128:64:128-a0:0:32-n32");
@ -1758,6 +1760,8 @@ public:
UseBitFieldTypeAlignment = false;
if (IsThumb) {
// Thumb1 add sp, #imm requires the immediate value be multiple of 4,
// so set preferred for small types to 32.
DescriptionString = ("e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-"
"i64:32:32-f32:32:32-f64:32:32-"
"v64:32:64-v128:32:128-a0:0:32-n32");