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# acdc419c 04-Feb-2022 Bjorn Pettersson <[email protected]>

[test] Use -passes=instcombine instead of -instcombine in lots of tests. NFC

Another step moving away from the deprecated syntax of specifying
pass pipeline in opt.

Differential Revision: https://r

[test] Use -passes=instcombine instead of -instcombine in lots of tests. NFC

Another step moving away from the deprecated syntax of specifying
pass pipeline in opt.

Differential Revision: https://reviews.llvm.org/D119081

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Revision tags: llvmorg-15-init, llvmorg-13.0.1, llvmorg-13.0.1-rc3, llvmorg-13.0.1-rc2, llvmorg-13.0.1-rc1, llvmorg-13.0.0, llvmorg-13.0.0-rc4, llvmorg-13.0.0-rc3, llvmorg-13.0.0-rc2, llvmorg-13.0.0-rc1, llvmorg-14-init, llvmorg-12.0.1, llvmorg-12.0.1-rc4, llvmorg-12.0.1-rc3, llvmorg-12.0.1-rc2, llvmorg-12.0.1-rc1, llvmorg-12.0.0, llvmorg-12.0.0-rc5, llvmorg-12.0.0-rc4
# 92da5b71 09-Mar-2021 Florian Hahn <[email protected]>

[InstCombine] Simplify phis with incoming pointer-casts.

If the incoming values of a phi are pointer casts of the same original
value, replace the phi with a single cast. Such redundant phis are
som

[InstCombine] Simplify phis with incoming pointer-casts.

If the incoming values of a phi are pointer casts of the same original
value, replace the phi with a single cast. Such redundant phis are
somewhat common after loop-rotate and removing them can avoid some
unnecessary code bloat, e.g. because an iteration of a loop is peeled
off to make the phi invariant. It should also simplify further analysis
on its own.

InstCombine already uses stripPointerCasts in a couple of places and
also simplifies phis based on the incoming values, so the patch should
fit in the existing scope.

The patch causes binary changes in 47 out of 237 benchmarks in
MultiSource/SPEC2000/SPEC2006 with -O3 -flto on X86.

Reviewed By: lebedev.ri

Differential Revision: https://reviews.llvm.org/D98058

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Revision tags: llvmorg-12.0.0-rc3
# 2bf1955f 05-Mar-2021 Florian Hahn <[email protected]>

[InstCombine] Pre-commit tests for redundant phis with pointer casts.

Pre-commit tests for D98058.