llvm-project

Commit Graph

Author	SHA1	Message	Date
Shimin Cui	95bda510fb	[ConstantFold] Fold the comparison of bitcasted global values This is to simplify icmp instructions in the form like: %cmp = icmp eq i32 (i8, i8)* bitcast (i32 (i32, i32)* @f32 to i32 %(i8, i8)), bitcast (i32 (i64, i64) @f64 to i32 (i8, i8)*) Here @f32 and @f64 are two functions. Differential Revision: https://reviews.llvm.org/D87850	2020-10-20 12:41:49 -07:00
Florian Hahn	5672ae8d86	[SCCP] Use constant ranges for select, if cond is overdefined. For selects with an unknown condition, we can approximate the result by merging the state of both options. This automatically takes care of the case where on operand is undef. Reviewers: davide, efriedma, mssimpso Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D71935	2020-03-18 09:26:02 +00:00
Florian Hahn	1d6f919df2	[SCCP] Explicitly mark values as overdefined (NFC). This was part of D60582 but can be committed separately.	2020-03-17 12:13:30 +00:00

Author

SHA1

Message

Date

Shimin Cui

95bda510fb

[ConstantFold] Fold the comparison of bitcasted global values

This is to simplify icmp instructions in the form like:

%cmp = icmp eq i32 (i8*, i8*)* bitcast (i32 (i32**, i32**)* @f32 to i32
%(i8*, i8*)), bitcast (i32 (i64**, i64**) @f64 to i32 (i8*, i8*)*)

Here @f32 and @f64 are two functions.

Differential Revision: https://reviews.llvm.org/D87850

2020-10-20 12:41:49 -07:00

Florian Hahn

5672ae8d86

[SCCP] Use constant ranges for select, if cond is overdefined.

For selects with an unknown condition, we can approximate the result by
merging the state of both options. This automatically takes care of
the case where on operand is undef.

Reviewers: davide, efriedma, mssimpso

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D71935

2020-03-18 09:26:02 +00:00

Florian Hahn

1d6f919df2

[SCCP] Explicitly mark values as overdefined (NFC).

This was part of D60582 but can be committed separately.

2020-03-17 12:13:30 +00:00

3 Commits