Summary:
The current uidiv supports archs without clz. However, the asm is for thumb2/arm.
For uidivmod, the existing code calls the C version of uidivmodsi4, which then calls uidiv. The extra push/pop/bl makes it less efficient.
Reviewers: jmolloy, jroelofs, joerg, compnerd, rengolin
Subscribers: llvm-commits, aemerson
Differential Revision: https://reviews.llvm.org/D27309
llvm-svn: 288710
When building with clang/LLVM in MSVC mode, the msvcrt libraries contain
these functions.
When building in a mingw environment, we need to provide them somehow,
e.g. via compiler-rt.
The aeabi divmod functions work in the same way as the corresponding
__rt_*div* functions for windows, but their parameters are swapped.
The functions for converting float to integer and vice versa are the
same as their aeabi equivalents, only with different function names.
Differential Revision: https://reviews.llvm.org/D26183
llvm-svn: 287465
These routines do not require executable stacks. However, by default ELFish
linkers may assume an executable stack on GNUish environments (and some non-GNU
ones too!). The GNU extension to add a note to indicate a non-executable stack
is honoured by these environments to mark the stack as non-executable (the
compiler normally emits this directive on appropriate targets whenever
possible). This allows normal builds from getting executable stacks due to
linking to the compiler rt builtins.
llvm-svn: 273500
The .align statements in ARM assembly routines is actually meant to be a power
of 2 alignment (e.g. .align 2 == 4 byte alignment, not 2). Switch to using
.p2align. .p2align is guaranteed to be a power-of-two alignment always and much
more explicit.
The .align in the case of x86_64 is byte alignment, use .balign instead of
.align.
llvm-svn: 208578
Weiming Zhao