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3 Commits

Author SHA1 Message Date
Vedant Kumar
7f8bbec84d [CorrelatedValuePropagation] Preserve debug locations (PR38178) 
Fix all of the missing debug location errors in CVP found by debugify.

This includes the missing-location-after-udiv-truncation case described
in llvm.org/PR38178.

llvm-svn: 347147
 2018-11-18 00:29:58 +00:00
Joel Galenson
4a22f1e2ee [CVP] Remove some {s|u}sub.with.overflow checks. 
This uses ConstantRange::makeGuaranteedNoWrapRegion's newly-added handling for subtraction to allow CVP to remove some subtraction overflow checks.

Differential Revision: https://reviews.llvm.org/D40039

llvm-svn: 319807
 2017-12-05 18:14:24 +00:00
Sanjoy Das
eb77be5924 [CVP] Remove some {s|u}add.with.overflow checks. 
Summary:
This adds logic to CVP to remove some overflow checks.  It uses LVI to remove
operations with at least one constant.  Specifically, this can remove many
overflow intrinsics immediately following an overflow check in the source code,
such as:

if (x < INT_MAX)
    ... x + 1 ...

Patch by Joel Galenson!

Reviewers: sanjoy, regehr

Reviewed By: sanjoy

Subscribers: fhahn, pirama, srhines, llvm-commits

Differential Revision: https://reviews.llvm.org/D39483

llvm-svn: 317911
 2017-11-10 19:13:35 +00:00