Chris Lattner a80d668215 Implement rdar://6480391, extending of equality icmp's to avoid a truncation. ...

I noticed this in the code compiled for a routine using std::map, which produced
this code:
	%25 = tail call i32 @memcmp(i8* %24, i8* %23, i32 6) nounwind readonly
	%.lobit.i = lshr i32 %25, 31		; <i32> [#uses=1]
	%tmp.i = trunc i32 %.lobit.i to i8		; <i8> [#uses=1]
	%toBool = icmp eq i8 %tmp.i, 0		; <i1> [#uses=1]
	br i1 %toBool, label %bb3, label %bb4
which compiled to:

	call	L_memcmp$stub
	shrl	$31, %eax
	testb	%al, %al
	jne	LBB1_11	## 

with this change, we compile it to:

	call	L_memcmp$stub
	testl	%eax, %eax
	js	LBB1_11

This triggers all the time in common code, with patters like this:

	%169 = and i32 %ply, 1		; <i32> [#uses=1]
	%170 = trunc i32 %169 to i8		; <i8> [#uses=1]
	%toBool = icmp ne i8 %170, 0		; <i1> [#uses=1]

 	%7 = lshr i32 %6, 24		; <i32> [#uses=1]
	%9 = trunc i32 %7 to i8		; <i8> [#uses=1]
	%10 = icmp ne i8 %9, 0		; <i1> [#uses=1]

etc



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61985 91177308-0d34-0410-b5e6-96231b3b80d8

2009-01-09 07:47:06 +00:00

..

ADCE

Remove the ability for ADCE to remove unreachable blocks in loop nests, because, as Eli pointed out, SimplifyCFG already does this.

2008-07-03 17:21:41 +00:00

ArgumentPromotion

Update the callgraph correctly in ArgumentPromotion.

2008-09-08 11:07:35 +00:00

BlockPlacement

Rationalize the names of passes that print information:

2008-09-23 12:47:39 +00:00

BranchFolding

…

CodeExtractor

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

CodeGenPrepare

reenable test

2008-11-24 21:27:20 +00:00

CondProp

…

ConstantMerge

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

ConstProp

apply Eli's patch for PR2165 and provide a testcase.

2008-10-16 05:26:51 +00:00

DeadArgElim

Support inreg, zext and sext as return value attributes.

2008-09-29 20:49:50 +00:00

DeadStoreElimination

Reimplement the inner loop of DSE. It now uniformly uses getDependence(),

2008-12-06 00:53:22 +00:00

FunctionAttrs

Remove alloca tracking from nocapture analysis. Not only

2009-01-07 19:39:06 +00:00

GlobalDCE

Delete unused global aliases with internal linkage.

2009-01-05 20:37:33 +00:00

GlobalOpt

Reimplement the old and horrible bison parser for .ll files with a nice

2009-01-02 07:01:27 +00:00

GVN

fix PR3217: fully cached queries need to be verified against the

2008-12-16 07:10:09 +00:00

GVNPRE

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

IndVarsSimplify

convertToSignExtendedInteger should return opInvalidOp instead of asserting if sematics of float does not allow arithmetics.

2008-11-25 19:00:29 +00:00

Inline

Do not inline functions with (dynamic) alloca into

2009-01-08 21:45:23 +00:00

InstCombine

Implement rdar://6480391, extending of equality icmp's to avoid a truncation.

2009-01-09 07:47:06 +00:00

Internalize

Teach the internalize pass to also internalize

2009-01-05 21:24:45 +00:00

IPConstantProp

Modify some ipconstprop tests to also test with invokes.

2008-06-19 09:27:44 +00:00

JumpThreading

Fix PR3298, a crash in Jump Threading. Apparently even

2009-01-09 06:08:12 +00:00

LCSSA

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

LICM

Remove GCSE and LoadVN from the testsuite.

2008-08-16 00:00:54 +00:00

LoopDeletion

don't spew tons of stuff to the output. This testcase is *not* for

2008-12-03 06:41:50 +00:00

LoopIndexSplit

Rewrite code that 1) filters loops and 2) calculates new loop bounds.

2008-12-04 21:38:42 +00:00

LoopRotate

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

LoopSimplify

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

LoopStrengthReduce

Remove.

2008-09-09 21:41:34 +00:00

LoopUnroll

Add -unroll-allow-partial command line option that enabled the loop unroller to

2008-07-29 13:21:23 +00:00

LoopUnswitch

Actually test something. Use PR3170 test case.

2008-12-08 23:44:46 +00:00

LowerInvoke

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

LowerSetJmp

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

LowerSwitch

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

Mem2Reg

no need to print output

2008-10-27 06:56:35 +00:00

MemCpyOpt

Fix two issues that Eli Friedman pointed out, where would misoptimized code like:

2008-06-01 22:26:26 +00:00

MergeFunc

Fix tests not to emit IR output

2008-11-04 23:02:39 +00:00

PredicateSimplifier

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

PruneEH

Do not inline functions with (dynamic) alloca into

2009-01-08 21:45:23 +00:00

RaiseAllocations

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

Reassociate

Remove GCSE and LoadVN from the testsuite.

2008-08-16 00:00:54 +00:00

ScalarRepl

This implements the second half of the fix for PR3290, handling

2009-01-08 05:42:05 +00:00

SCCP

Fix SCCP's handling of struct value loads and stores. SCCP doesn't

2008-08-13 21:22:48 +00:00

SimplifyCFG

Add a helper to remove a branch and DCE the condition, and use it

2008-12-16 20:54:32 +00:00

SimplifyLibCalls

Run a post-pass that marks known function declarations by name.

2009-01-04 20:27:34 +00:00

SRETPromotion

Add a basic test for the SRETPromotion pass.

2008-08-07 15:55:18 +00:00

StripSymbols

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

TailCallElim

sabre brings to my attention that the 'tr' suffix is also obsolete

2008-05-20 21:00:03 +00:00

TailDup

Revert 52223.

2008-06-12 20:55:39 +00:00