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Ding dong, the DoesntAccessMemoryFns and

Browse Source 
OnlyReadsMemoryFns tables are dead!  We
get more, and more accurate, information
from gcc via the readnone and readonly
function attributes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44288 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2007-11-23 19:30:27 +00:00
parent bb65098d2c
commit e4dc717585
8 changed files with 83 additions and 193 deletions
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19
test/Analysis/LoadVN/call_cse.ll
View File

@@ -1,11 +1,12 @@
; RUN: llvm-upgrade < %s | llvm-as | opt -basicaa -load-vn -gcse -instcombine | llvm-dis | not grep sub
declare int %strlen(sbyte*)
; RUN: llvm-as < %s | opt -basicaa -load-vn -gcse -instcombine | llvm-dis | not grep sub
int %test(sbyte* %P) {
%X = call int %strlen(sbyte* %P)
%A = add int %X, 14
%Y = call int %strlen(sbyte* %P)
%Z = sub int %X, %Y
%B = add int %A, %Z
ret int %B
declare i32 @strlen(i8*) readonly
define i32 @test(i8* %P) {
%X = call i32 @strlen( i8* %P ) readonly ; <i32> [#uses=2]
%A = add i32 %X, 14 ; <i32> [#uses=1]
%Y = call i32 @strlen( i8* %P ) readonly ; <i32> [#uses=1]
%Z = sub i32 %X, %Y ; <i32> [#uses=1]
%B = add i32 %A, %Z ; <i32> [#uses=1]
ret i32 %B
}

21
test/Analysis/LoadVN/call_pure_function.ll
View File

@@ -1,13 +1,14 @@
; RUN: llvm-upgrade < %s | llvm-as | opt -basicaa -load-vn -gcse -instcombine | llvm-dis | not grep sub
declare int %strlen(sbyte*)
declare void %use(int %X)
; RUN: llvm-as < %s | opt -basicaa -load-vn -gcse -instcombine | llvm-dis | not grep sub
sbyte %test(sbyte* %P, sbyte* %Q) {
%A = load sbyte* %Q
%X = call int %strlen(sbyte* %P)
%B = load sbyte* %Q ;; CSE with A.
call void %use(int %X) ;; make strlen not dead
declare i32 @strlen(i8*) readonly
%C = sub sbyte %A, %B
ret sbyte %C
declare void @use(i32)
define i8 @test(i8* %P, i8* %Q) {
%A = load i8* %Q ; <i8> [#uses=1]
%X = call i32 @strlen( i8* %P ) readonly ; <i32> [#uses=1]
%B = load i8* %Q ; <i8> [#uses=1]
call void @use( i32 %X )
%C = sub i8 %A, %B ; <i8> [#uses=1]
ret i8 %C
}