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Revision tags: llvmorg-20.1.0, llvmorg-20.1.0-rc3, llvmorg-20.1.0-rc2, llvmorg-20.1.0-rc1, llvmorg-21-init, llvmorg-19.1.7, llvmorg-19.1.6, llvmorg-19.1.5, llvmorg-19.1.4, llvmorg-19.1.3, llvmorg-19.1.2, llvmorg-19.1.1, llvmorg-19.1.0, llvmorg-19.1.0-rc4, llvmorg-19.1.0-rc3, llvmorg-19.1.0-rc2, llvmorg-19.1.0-rc1, llvmorg-20-init, llvmorg-18.1.8, llvmorg-18.1.7, llvmorg-18.1.6, llvmorg-18.1.5, llvmorg-18.1.4, llvmorg-18.1.3, llvmorg-18.1.2, llvmorg-18.1.1, llvmorg-18.1.0, llvmorg-18.1.0-rc4, llvmorg-18.1.0-rc3, llvmorg-18.1.0-rc2, llvmorg-18.1.0-rc1, llvmorg-19-init, llvmorg-17.0.6, llvmorg-17.0.5, llvmorg-17.0.4, llvmorg-17.0.3, llvmorg-17.0.2, llvmorg-17.0.1, llvmorg-17.0.0, llvmorg-17.0.0-rc4, llvmorg-17.0.0-rc3, llvmorg-17.0.0-rc2, llvmorg-17.0.0-rc1, llvmorg-18-init, llvmorg-16.0.6, llvmorg-16.0.5, llvmorg-16.0.4, llvmorg-16.0.3, llvmorg-16.0.2, llvmorg-16.0.1, llvmorg-16.0.0, llvmorg-16.0.0-rc4, llvmorg-16.0.0-rc3, llvmorg-16.0.0-rc2, llvmorg-16.0.0-rc1, llvmorg-17-init, llvmorg-15.0.7, llvmorg-15.0.6, llvmorg-15.0.5, llvmorg-15.0.4, llvmorg-15.0.3, llvmorg-15.0.2, llvmorg-15.0.1, llvmorg-15.0.0, llvmorg-15.0.0-rc3, llvmorg-15.0.0-rc2, llvmorg-15.0.0-rc1, llvmorg-16-init, llvmorg-14.0.6, llvmorg-14.0.5, llvmorg-14.0.4 |
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8d03c49f |
| 03-May-2022 |
Matthias Braun <[email protected]> |
Extend switch condition in optimizeSwitchPhiConst when free
In a case like:
switch((i32)x) { case 42: phi((i64)42, ...); }
replace `(i64)42` with `zext(x)` when we can do so for free.
This fi
Extend switch condition in optimizeSwitchPhiConst when free
In a case like:
switch((i32)x) { case 42: phi((i64)42, ...); }
replace `(i64)42` with `zext(x)` when we can do so for free.
This fixes a part of https://github.com/llvm/llvm-project/issues/55153
Differential Revision: https://reviews.llvm.org/D124897
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| #
de9ad98d |
| 11-May-2022 |
Matthias Braun <[email protected]> |
Fix endless loop in optimizePhiConst with integer constant switch condition
Avoid endless loop in degenerate case with an integer constant as switch
condition as reported in https://reviews.llvm.org
Fix endless loop in optimizePhiConst with integer constant switch condition
Avoid endless loop in degenerate case with an integer constant as switch
condition as reported in https://reviews.llvm.org/D124552
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Revision tags: llvmorg-14.0.3 |
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| #
f0ea9c9c |
| 27-Apr-2022 |
Matthias Braun <[email protected]> |
CodeGenPrepare: Replace constant PHI arguments with switch condition value
We often see code like the following after running SCCP:
switch (x) { case 42: phi(42, ...); }
This tends to produce
CodeGenPrepare: Replace constant PHI arguments with switch condition value
We often see code like the following after running SCCP:
switch (x) { case 42: phi(42, ...); }
This tends to produce bad code as we currently materialize the constant
phi-argument in the switch-block. This increases register pressure and
if the pattern repeats for `n` case statements, we end up generating `n`
constant values.
This changes CodeGenPrepare to catch this pattern and revert it back to:
switch (x) { case 42: phi(x, ...); }
Differential Revision: https://reviews.llvm.org/D124552
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