It is safe if CPSR is killed or re-defined.
When we are done with the basic block, check whether CPSR is live-out.
Do not optimize away cmp if CPSR is live-out.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160090 91177308-0d34-0410-b5e6-96231b3b80d8
Low order register of a double word register operand. Operands
are defined by the name of the variable they are marked with in
the inline assembler code. This is a way to specify that the
operand just refers to the low order register for that variable.
It is the opposite of modifier 'D' which specifies the high order
register.
Example:
main()
{
long long ll_input = 0x1111222233334444LL;
long long ll_val = 3;
int i_result = 0;
__asm__ __volatile__(
"or %0, %L1, %2"
: "=r" (i_result)
: "r" (ll_input), "r" (ll_val));
}
Which results in:
lui $2, %hi(_gp_disp)
addiu $2, $2, %lo(_gp_disp)
addiu $sp, $sp, -8
addu $2, $2, $25
sw $2, 0($sp)
lui $2, 13107
ori $3, $2, 17476 <-- Low 32 bits of ll_input
lui $2, 4369
ori $4, $2, 8738 <-- High 32 bits of ll_input
addiu $5, $zero, 3 <-- Low 32 bits of ll_val
addiu $2, $zero, 0 <-- High 32 bits of ll_val
#APP
or $3, $4, $5 <-- or i_result, high 32 ll_input, low 32 of ll_val
#NO_APP
addiu $sp, $sp, 8
jr $ra
If not direction is done for the long long for 32 bit variables results
in using the low 32 bits as ll_val shows.
There is an existing bug if 'L' or 'D' is used for the destination register
for 32 bit long longs in that the target value will be updated incorrectly
for the non-specified part unless explicitly set within the inline asm code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160028 91177308-0d34-0410-b5e6-96231b3b80d8
X86. Basically, this is a reapplication of r158087 with a few fixes.
Specifically, (1) the stack pointer is restored from the base pointer before
popping callee-saved registers and (2) in obscure cases (see comments in patch)
we must cache the value of the original stack adjustment in the prologue and
apply it in the epilogue.
rdar://11496434
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160002 91177308-0d34-0410-b5e6-96231b3b80d8
multiple scalars and insert them into a vector. Next, we shuffle the elements
into the correct places, as before.
Also fix a small dagcombine bug in SimplifyBinOpWithSameOpcodeHands, when the
migration of bitcasts happened too late in the SelectionDAG process.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159991 91177308-0d34-0410-b5e6-96231b3b80d8
Previously, this would become an integer extension operation, followed by a real integer->float conversion.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159957 91177308-0d34-0410-b5e6-96231b3b80d8
getCondFromSETOpc, getCondFromCMovOpc, getSETFromCond, getCMovFromCond
No functional change intended.
If we want to update the condition code of CMOV|SET|Jcc, we first analyze the
opcode to get the condition code, then update the condition code, finally
synthesize the new opcode form the new condition code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159955 91177308-0d34-0410-b5e6-96231b3b80d8
Access mips register classes via MCRegisterInfo's functions instead of via the
TargetRegisterClasses defined in MipsGenRegisterInfo.inc.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159953 91177308-0d34-0410-b5e6-96231b3b80d8
This patch removes ~70 lines in InstCombineLoadStoreAlloca.cpp and makes both functions a bit more aggressive than before :)
In theory, we can be more aggressive when removing an alloca than a malloc, because an alloca pointer should never escape, but we are not taking advantage of this anyway
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159952 91177308-0d34-0410-b5e6-96231b3b80d8
It is safe if EFLAGS is killed or re-defined.
When we are done with the basic block, check whether EFLAGS is live-out.
Do not optimize away cmp if EFLAGS is live-out.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159888 91177308-0d34-0410-b5e6-96231b3b80d8
This means we can do cheap DSE for heap memory.
Nothing is done if the pointer excapes or has a load.
The churn in the tests is mostly due to objectsize, since we want to make sure we
don't delete the malloc call before evaluating the objectsize (otherwise it becomes -1/0)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159876 91177308-0d34-0410-b5e6-96231b3b80d8
For each Cmp, we check whether there is an earlier Sub which make Cmp
redundant. We handle the case where SUB operates on the same source operands as
Cmp, including the case where the two source operands are swapped.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159838 91177308-0d34-0410-b5e6-96231b3b80d8
DwarfDebug class could generate the same (inlined) DIVariable twice:
1) when trying to find abstract debug variable for a concrete inlined instance.
2) when explicitly collecting info for variables that were optimized out.
This change makes sure that this duplication won't happen and makes
Clang pass "gdb.opt/inline-locals" test from gdb testsuite.
Reviewed by Eric Christopher.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159811 91177308-0d34-0410-b5e6-96231b3b80d8
Print the second half of a double word operand.
The include list was cleaned up a bit as well.
Also the test case was modified to test for both
big and little patterns.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159787 91177308-0d34-0410-b5e6-96231b3b80d8
The CopyToReg nodes that set up the argument registers before a call
must be glued to the call instruction. Otherwise, the scheduler may emit
the physreg copies long before the call, causing long live ranges for
the fixed registers.
Besides disabling good register allocation, that can also expose
problems when EmitInstrWithCustomInserter() splits a basic block during
the live range of a physreg.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159721 91177308-0d34-0410-b5e6-96231b3b80d8
Implement the TII hooks needed by EarlyIfConversion to create cmov
instructions and estimate their latency.
Early if-conversion is still not enabled by default.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159695 91177308-0d34-0410-b5e6-96231b3b80d8
- execute_external should be;
- Not on Win32.
- Using bash.
In reverse, "execute_internal" shoud be (Win32 && !bash).
- lit.getBashPath() behaves differently before and after tweaking $PATH.
I will add a few explanations there later.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159641 91177308-0d34-0410-b5e6-96231b3b80d8
