[stack protector] Set edge weights for newly created basic blocks.

This commit fixes a bug in stack protector pass where edge weights were not set
when new basic blocks were added to lists of successor basic blocks.

Differential Revision: http://reviews.llvm.org/D5766

llvm-svn: 222987

1 files changed, 36 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/stack-protector-weight.ll b/llvm/test/CodeGen/X86/stack-protector-weight.ll
new file mode 100644
index 00000000000..c5bf49134e4
--- /dev/null
+++ b/llvm/test/CodeGen/X86/stack-protector-weight.ll
@@ -0,0 +1,36 @@
+; RUN: llc -mtriple=x86_64-apple-darwin -print-machineinstrs=expand-isel-pseudos -enable-selectiondag-sp=true %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=SELDAG
+; RUN: llc -mtriple=x86_64-apple-darwin -print-machineinstrs=expand-isel-pseudos -enable-selectiondag-sp=false %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=IR
+
+; SELDAG: # Machine code for function test_branch_weights:
+; SELDAG: Successors according to CFG: BB#[[SUCCESS:[0-9]+]](1048575) BB#[[FAILURE:[0-9]+]](1)
+; SELDAG: BB#[[FAILURE]]:
+; SELDAG: CALL64pcrel32 <es:__stack_chk_fail>
+; SELDAG: BB#[[SUCCESS]]:
+
+; IR: # Machine code for function test_branch_weights:
+; IR: Successors according to CFG: BB#[[SUCCESS:[0-9]+]](1048575) BB#[[FAILURE:[0-9]+]](1)
+; IR: BB#[[SUCCESS]]:
+; IR: BB#[[FAILURE]]:
+; IR: CALL64pcrel32 <ga:@__stack_chk_fail>
+
+define i32 @test_branch_weights(i32 %n) #0 {
+entry:
+  %a = alloca [128 x i32], align 16
+  %0 = bitcast [128 x i32]* %a to i8*
+  call void @llvm.lifetime.start(i64 512, i8* %0)
+  %arraydecay = getelementptr inbounds [128 x i32]* %a, i64 0, i64 0
+  call void @foo2(i32* %arraydecay)
+  %idxprom = sext i32 %n to i64
+  %arrayidx = getelementptr inbounds [128 x i32]* %a, i64 0, i64 %idxprom
+  %1 = load i32* %arrayidx, align 4
+  call void @llvm.lifetime.end(i64 512, i8* %0)
+  ret i32 %1
+}
+
+declare void @llvm.lifetime.start(i64, i8* nocapture)
+
+declare void @foo2(i32*)
+
+declare void @llvm.lifetime.end(i64, i8* nocapture)
+
+attributes #0 = { ssp "stack-protector-buffer-size"="8" }