1 files changed, 72 insertions, 0 deletions
diff --git a/test/CodeGen/X86/regpressure.ll b/test/CodeGen/X86/regpressure.ll
new file mode 100644
index 0000000000..8cb6b0ee5a
--- /dev/null
+++ b/test/CodeGen/X86/regpressure.ll
@@ -0,0 +1,72 @@
+;; Both functions in this testcase should codegen to the same function, and
+;; neither of them should require spilling anything to the stack.
+
+; RUN: llvm-as < %s | llc -march=x86 -disable-pattern-isel=0 -stats  2>&1 | not grep 'Number of register spills'
+
+;; This can be compiled to use three registers if the loads are not
+;; folded into the multiplies, 2 registers otherwise.
+int %regpressure1(int* %P) {
+	%A = load int* %P
+	%Bp = getelementptr int* %P, int 1
+	%B = load int* %Bp
+	%s1 = mul int %A, %B
+	%Cp = getelementptr int* %P, int 2
+	%C = load int* %Cp
+	%s2 = mul int %s1, %C
+	%Dp = getelementptr int* %P, int 3
+	%D = load int* %Dp
+	%s3 = mul int %s2, %D
+	%Ep = getelementptr int* %P, int 4
+	%E = load int* %Ep
+	%s4 = mul int %s3, %E
+	%Fp = getelementptr int* %P, int 5
+	%F = load int* %Fp
+	%s5 = mul int %s4, %F
+	%Gp = getelementptr int* %P, int 6
+	%G = load int* %Gp
+	%s6 = mul int %s5, %G
+	%Hp = getelementptr int* %P, int 7
+	%H = load int* %Hp
+	%s7 = mul int %s6, %H
+	%Ip = getelementptr int* %P, int 8
+	%I = load int* %Ip
+	%s8 = mul int %s7, %I
+	%Jp = getelementptr int* %P, int 9
+	%J = load int* %Jp
+	%s9 = mul int %s8, %J
+	ret int %s9
+}
+
+;; This testcase should produce identical code to the test above.
+int %regpressure2(int* %P) {
+	%A = load int* %P
+	%Bp = getelementptr int* %P, int 1
+	%B = load int* %Bp
+	%Cp = getelementptr int* %P, int 2
+	%C = load int* %Cp
+	%Dp = getelementptr int* %P, int 3
+	%D = load int* %Dp
+	%Ep = getelementptr int* %P, int 4
+	%E = load int* %Ep
+	%Fp = getelementptr int* %P, int 5
+	%F = load int* %Fp
+	%Gp = getelementptr int* %P, int 6
+	%G = load int* %Gp
+	%Hp = getelementptr int* %P, int 7
+	%H = load int* %Hp
+	%Ip = getelementptr int* %P, int 8
+	%I = load int* %Ip
+	%Jp = getelementptr int* %P, int 9
+	%J = load int* %Jp
+	%s1 = mul int %A, %B
+	%s2 = mul int %s1, %C
+	%s3 = mul int %s2, %D
+	%s4 = mul int %s3, %E
+	%s5 = mul int %s4, %F
+	%s6 = mul int %s5, %G
+	%s7 = mul int %s6, %H
+	%s8 = mul int %s7, %I
+	%s9 = mul int %s8, %J
+	ret int %s9
+}
+