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llvm-mirror/test/Assembler/ConstantExprNoFold.ll

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Fix ConstantFold's folding of icmp instructions to recognize that, for example, a one-past-the-end pointer from one global variable may be equal to the base pointer of another global variable. llvm-svn: 173995
2013-01-31 00:01:45 +00:00
; This test checks to make sure that constant exprs don't fold in some simple
; situations
; RUN: llvm-as < %s | llvm-dis | FileCheck %s
verify-uselistorder: Change the default -num-shuffles=5 Change the default for `-num-shuffles` to 5 and better document the algorithm in the header docs of `verify-uselistorder`. llvm-svn: 214419
2014-07-31 18:46:24 +00:00
; RUN: verify-uselistorder %s -preserve-bc-use-list-order
Fix ConstantFold's folding of icmp instructions to recognize that, for example, a one-past-the-end pointer from one global variable may be equal to the base pointer of another global variable. llvm-svn: 173995
2013-01-31 00:01:45 +00:00
; Even give it a datalayout, to tempt folding as much as possible.
target datalayout = "p:32:32"
@A = global i64 0
@B = global i64 0
; Don't fold this. @A might really be allocated next to @B, in which case the
; icmp should return true. It's not valid to *dereference* in @B from a pointer
; based on @A, but icmp isn't a dereference.
; CHECK: @C = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* @B)
@C = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* @B)
; Don't fold this completely away either. In theory this could be simplified
; to only use a gep on one side of the icmp though.
; CHECK: @D = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* getelementptr inbounds (i64* @B, i64 2))
@D = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* getelementptr inbounds (i64* @B, i64 2))
Add addrspacecast instruction. Patch by Michele Scandale! llvm-svn: 194760
2013-11-15 01:34:59 +00:00
; CHECK: @E = global i64 addrspace(1)* addrspacecast (i64* @A to i64 addrspace(1)*)
@E = global i64 addrspace(1)* addrspacecast(i64* @A to i64 addrspace(1)*)
IR: Don't add inbounds to GEPs of extern_weak variables Global variables that have `extern_weak` linkage may be null, so it's incorrect to add `inbounds` when constant folding. This also fixes a bug when parsing global aliases, whose forward reference placeholders are global variables with `extern_weak` linkage. If GEPs to these aliases are encountered before the alias itself, the GEPs would incorrectly gain the `inbounds` keyword as well. llvm-svn: 215803
2014-08-16 01:54:32 +00:00
; Don't add an inbounds on @weak.gep, since @weak may be null.
; CHECK: @weak.gep = global i32* getelementptr (i32* @weak, i32 1)
@weak.gep = global i32* getelementptr (i32* @weak, i32 1)
@weak = extern_weak global i32
; Don't add an inbounds on @glob.a3, since it's not inbounds.
; CHECK: @glob.a3 = alias getelementptr (i32* @glob.a2, i32 1)
@glob = global i32 0
@glob.a3 = alias getelementptr (i32* @glob.a2, i32 1)
@glob.a2 = alias getelementptr (i32* @glob.a1, i32 1)
@glob.a1 = alias i32* @glob
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