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off.
This fixes a regression from r365860: As that commit message
states, there are 3 valid states targeted by the combination of
-f(no-)omit-frame-pointer and -m(no-)omit-leaf-frame-pointer.
After r365860 it's impossible to get from state 10 (omit just
leaf frame pointers) to state 11 (omit all frame pointers)
in a single command line without getting a warning.
This change restores that functionality.
Fixes PR42966.
Differential Revision: https://reviews.llvm.org/D66142
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@368728 91177308-0d34-0410-b5e6-96231b3b80d8
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with '-mframe-pointer'
After D56351 and D64294, frame pointer handling is migrated to tri-state
(all, non-leaf, none) in clang driver and on the function attribute.
This patch makes the frame pointer handling cc1 option tri-state.
Reviewers: chandlerc, rnk, t.p.northover, MaskRay
Reviewed By: MaskRay
Differential Revision: https://reviews.llvm.org/D56353
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@366645 91177308-0d34-0410-b5e6-96231b3b80d8
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NetBSD, Linux, CloudABI and Hurd already omit frame pointer for PowerPC.
Make it do so for other platforms.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@365862 91177308-0d34-0410-b5e6-96231b3b80d8
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-m(no-)?omit-leaf-frame-pointer
Use a tri-state enum to represent shouldUseFramePointer() and
shouldUseLeafFramePointer().
This simplifies the logic and fixes PR9825:
-fno-omit-frame-pointer doesn't imply -mno-omit-leaf-frame-pointer.
and PR24003:
/Oy- /O2 should not omit leaf frame pointer: this matches MSVC x86-32.
(/Oy- is a no-op on MSVC x86-64.)
and:
when CC1 option -mdisable-fp-elim if absent, -momit-leaf-frame-pointer
can also be omitted.
The new behavior matches GCC:
-fomit-frame-pointer wins over -mno-omit-leaf-frame-pointer
-fno-omit-frame-pointer loses out to -momit-leaf-frame-pointer
The behavior makes lots of sense. We have 4 states:
- 00) leaf retained, non-leaf retained
- 01) leaf retained, non-leaf omitted (this is invalid)
- 10) leaf omitted, non-leaf retained (what -momit-leaf-frame-pointer was designed for)
- 11) leaf omitted, non-leaf omitted
"omit" options taking precedence over "no-omit" options is the only way
to make 3 valid states representable with -f(no-)?omit-frame-pointer and
-m(no-)?omit-leaf-pointer.
Reviewed By: ychen
Differential Revision: https://reviews.llvm.org/D64294
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@365860 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@364679 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@358775 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@358245 91177308-0d34-0410-b5e6-96231b3b80d8
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pointer optimisation by default when using optimisation.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@337274 91177308-0d34-0410-b5e6-96231b3b80d8
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In r279546 I disabled all frame pointer elimination at the front-end on
ARM-Darwin (and warned about it) because before that the backend had been
silently ignoring these options. It turns out we didn't ignore
-momit-leaf-frame-pointer though, just the more general -fomit-frame-pointer.
So this re-enables passing that down to CodeGen so that everything really does
continue working as before (with better diagnostics).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@293311 91177308-0d34-0410-b5e6-96231b3b80d8
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when compiling with optimization when PS4 is the target.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@279603 91177308-0d34-0410-b5e6-96231b3b80d8
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iOS (and other 32-bit ARM variants) always require a valid frame pointer to
improve backtraces. Previously the -fomit-frame-pointer and
-momit-leaf-frame-pointer options were being silently discarded via hacks in
the backend. It's better if Clang configures itself to emit the correct IR and
warns about (ignored) attempts to override this.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@279546 91177308-0d34-0410-b5e6-96231b3b80d8
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On Linux we pass in -fomit-frame-pointer flags (and similar)
automatically if optimization is enabled. Let's do the same thing on
CloudABI. Without this, Clang seems to run out of registers quite
quickly while trying to build code with inline assembly.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@278393 91177308-0d34-0410-b5e6-96231b3b80d8
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We're not that much into metals.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@227696 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@227592 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@178607 91177308-0d34-0410-b5e6-96231b3b80d8
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