From 029f4fd2ff539ed143b83c140349df2c064965d2 Mon Sep 17 00:00:00 2001
From: Andrew Trick <atrick@apple.com>
Date: Mon, 25 Feb 2013 19:11:48 +0000
Subject: pre-RA-sched fix: only reevaluate physreg interferences when
 necessary.

Fixes rdar:13279013: scheduler was blowing up on select instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176037 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/X86/pre-ra-sched.ll | 56 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 test/CodeGen/X86/pre-ra-sched.ll

(limited to 'test')

diff --git a/test/CodeGen/X86/pre-ra-sched.ll b/test/CodeGen/X86/pre-ra-sched.ll
new file mode 100644
index 0000000..b792ffa
--- /dev/null
+++ b/test/CodeGen/X86/pre-ra-sched.ll
@@ -0,0 +1,56 @@
+; RUN: llc < %s -mtriple=x86_64-apple-macosx -debug-only=pre-RA-sched \
+; RUN:     2>&1 | FileCheck %s
+; REQUIRES: asserts
+;
+; rdar:13279013: pre-RA-sched should not check all interferences and
+; repush them on the ready queue after scheduling each instruction.
+;
+; CHECK: *** List Scheduling
+; CHECK: Interfering reg EFLAGS
+; CHECK: Repushing
+; CHECK: Repushing
+; CHECK: Repushing
+; CHECK-NOT: Repushing
+; CHECK: *** Final schedule
+define i32 @test(i8* %pin) #0 {
+  %g0 = getelementptr inbounds i8* %pin, i64 0
+  %l0 = load i8* %g0, align 1
+
+  %g1a = getelementptr inbounds i8* %pin, i64 1
+  %l1a = load i8* %g1a, align 1
+  %z1a = zext i8 %l1a to i32
+  %g1b = getelementptr inbounds i8* %pin, i64 2
+  %l1b = load i8* %g1b, align 1
+  %z1b = zext i8 %l1b to i32
+  %c1 = icmp ne i8 %l0, 0
+  %x1 = xor i32 %z1a, %z1b
+  %s1 = select i1 %c1, i32 %z1a, i32 %x1
+
+  %g2a = getelementptr inbounds i8* %pin, i64 3
+  %l2a = load i8* %g2a, align 1
+  %z2a = zext i8 %l2a to i32
+  %g2b = getelementptr inbounds i8* %pin, i64 4
+  %l2b = load i8* %g2b, align 1
+  %z2b = zext i8 %l2b to i32
+  %x2 = xor i32 %z2a, %z2b
+  %s2 = select i1 %c1, i32 %z2a, i32 %x2
+
+  %g3a = getelementptr inbounds i8* %pin, i64 5
+  %l3a = load i8* %g3a, align 1
+  %z3a = zext i8 %l3a to i32
+  %g3b = getelementptr inbounds i8* %pin, i64 6
+  %l3b = load i8* %g3b, align 1
+  %z3b = zext i8 %l3b to i32
+  %x3 = xor i32 %z3a, %z3b
+  %s3 = select i1 %c1, i32 %z3a, i32 %x3
+
+  %c3 = icmp ne i8 %l1a, 0
+  %c4 = icmp ne i8 %l2a, 0
+
+  %s4 = select i1 %c3, i32 %s1, i32 %s2
+  %s5 = select i1 %c4, i32 %s4, i32 %s3
+
+  ret i32 %s5
+}
+
+attributes #0 = { nounwind ssp uwtable }
-- 
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