llvm-project

Commit Graph

Author	SHA1	Message	Date
NAKAMURA Takumi	4b04c11d00	clang/test/CodeGen/builtin-assume*.c: Fixup for -Asserts. llvm-svn: 217352	2014-09-08 01:12:55 +00:00
Hal Finkel	bcc06085a8	Add __builtin_assume and __builtin_assume_aligned using @llvm.assume. This makes use of the recently-added @llvm.assume intrinsic to implement a __builtin_assume(bool) intrinsic (to provide additional information to the optimizer). This hooks up __assume in MS-compatibility mode to mirror __builtin_assume (the semantics have been intentionally kept compatible), and implements GCC's __builtin_assume_aligned as assume((p - o) & mask == 0). LLVM now contains special logic to deal with assumptions of this form. llvm-svn: 217349	2014-09-07 22:58:14 +00:00
Hal Finkel	3e49fda0d4	Add basic (noop) CodeGen support for __assume Clang supports __assume, at least at the semantic level, when MS extensions are enabled. Unfortunately, trying to actually compile code using __assume would result in this error: error: cannot compile this builtin function yet __assume is an optimizer hint, and can be ignored at the IR level. Until LLVM supports assumptions at the IR level, a noop lowering is valid, and that is what is done here. llvm-svn: 213206	2014-07-16 22:44:54 +00:00

Author

SHA1

Message

Date

NAKAMURA Takumi

4b04c11d00

clang/test/CodeGen/builtin-assume*.c: Fixup for -Asserts.

llvm-svn: 217352

2014-09-08 01:12:55 +00:00

Hal Finkel

bcc06085a8

Add __builtin_assume and __builtin_assume_aligned using @llvm.assume.

This makes use of the recently-added @llvm.assume intrinsic to implement a
__builtin_assume(bool) intrinsic (to provide additional information to the
optimizer). This hooks up __assume in MS-compatibility mode to mirror
__builtin_assume (the semantics have been intentionally kept compatible), and
implements GCC's __builtin_assume_aligned as assume((p - o) & mask == 0). LLVM
now contains special logic to deal with assumptions of this form.

llvm-svn: 217349

2014-09-07 22:58:14 +00:00

Hal Finkel

3e49fda0d4

Add basic (noop) CodeGen support for __assume

Clang supports __assume, at least at the semantic level, when MS extensions are
enabled. Unfortunately, trying to actually compile code using __assume would
result in this error:

  error: cannot compile this builtin function yet

__assume is an optimizer hint, and can be ignored at the IR level. Until LLVM
supports assumptions at the IR level, a noop lowering is valid, and that is
what is done here.

llvm-svn: 213206

2014-07-16 22:44:54 +00:00

3 Commits