David Bolvansky af1b3185f5 [InstCombine] Fold select (icmp sgt x, -1), lshr (X, Y), ashr (X, Y) to ashr (X, Y)) ... Summary: (select (icmp sgt x, -1), lshr (X, Y), ashr (X, Y)) -> ashr (X, Y)) (select (icmp slt x, 1), ashr (X, Y), lshr (X, Y)) -> ashr (X, Y)) Fixes PR41173 Alive proof by @lebedev.ri (thanks) Name: PR41173 %cmp = icmp slt i32 %x, 1 %shr = lshr i32 %x, %y %shr1 = ashr i32 %x, %y %retval.0 = select i1 %cmp, i32 %shr1, i32 %shr => %retval.0 = ashr i32 %x, %y Optimization: PR41173 Done: 1 Optimization is correct! Reviewers: lebedev.ri, spatel Reviewed By: lebedev.ri Subscribers: nikic, craig.topper, llvm-commits, lebedev.ri Tags: #llvm Differential Revision: https://reviews.llvm.org/D64285 llvm-svn: 365893		2019-07-12 11:31:16 +00:00
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AggressiveInstCombine	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
Coroutines	Simplify std::lower_bound with llvm::{bsearch,lower_bound}. NFC	2019-06-21 05:40:31 +00:00
Hello	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
IPO	[Attributor] Deduce "nosync" function attribute.	2019-07-11 21:37:40 +00:00
InstCombine	[InstCombine] Fold select (icmp sgt x, -1), lshr (X, Y), ashr (X, Y) to ashr (X, Y))	2019-07-12 11:31:16 +00:00
Instrumentation	[NewPM] Port Sancov	2019-07-11 22:35:40 +00:00
ObjCARC	[ObjC][ARC] Delete ObjC runtime calls on global variables annotated	2019-06-14 22:06:32 +00:00
Scalar	OpaquePtr: use load instruction directly for type. NFC.	2019-07-11 13:12:08 +00:00
Utils	[InstCombine] Reorder pow() transformations (NFC)	2019-07-12 00:33:49 +00:00
Vectorize	[SLP] Optimize getSpillCost(); NFCI	2019-07-09 20:24:44 +00:00
CMakeLists.txt	Another try to commit 323321 (aggressive instruction combine).	2018-01-25 12:06:32 +00:00
LLVMBuild.txt	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00