This is a carefully contrived testcase where the X86 ISel is emitting all loads

before other ops, causing it to spill like mad.  This occurs in
164.gzip:flush_block.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19648 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/regpressure.ll b/test/CodeGen/X86/regpressure.ll
index 8cb6b0e..1ba381d 100644 (file)
--- a/test/CodeGen/X86/regpressure.ll
+++ b/test/CodeGen/X86/regpressure.ll
@@ -70,3 +70,48 @@ int %regpressure2(int* %P) {
        ret int %s9
 }
 
+;; adds should be the same as muls.
+int %regpressure3(short* %P, bool %Cond, int* %Other) {
+       %A = load short* %P
+       %Bp = getelementptr short* %P, int 1
+       %B = load short* %Bp
+       %Cp = getelementptr short* %P, int 2
+       %C = load short* %Cp
+       %Dp = getelementptr short* %P, int 3
+       %D = load short* %Dp
+       %Ep = getelementptr short* %P, int 4
+       %E = load short* %Ep
+       %Fp = getelementptr short* %P, int 5
+       %F = load short* %Fp
+       %Gp = getelementptr short* %P, int 6
+       %G = load short* %Gp
+       %Hp = getelementptr short* %P, int 7
+       %H = load short* %Hp
+       %Ip = getelementptr short* %P, int 8
+       %I = load short* %Ip
+       %Jp = getelementptr short* %P, int 9
+       %J = load short* %Jp
+
+        ;; These casts prevent folding the loads into the adds.
+       %A = cast short %A to int
+       %B = cast short %B to int
+       %D = cast short %D to int
+       %C = cast short %C to int
+       %E = cast short %E to int
+       %F = cast short %F to int
+       %G = cast short %G to int
+       %H = cast short %H to int
+       %I = cast short %I to int
+       %J = cast short %J to int
+       %s1 = add int %A, %B
+       %s2 = add int %C, %s1
+       %s3 = add int %D, %s2
+       %s4 = add int %E, %s3
+       %s5 = add int %F, %s4
+       %s6 = add int %G, %s5
+       %s7 = add int %H, %s6
+       %s8 = add int %I, %s7
+       %s9 = add int %J, %s8
+       ret int %s9
+}
+