Rebased PNaCl localmods in LLVM to 223109

test/NaCl/X86/pnacl-avoids-r11-x86-64.c

+/*
+  Object file built using:
+  pnacl-clang -S -O2 -emit-llvm -o pnacl-avoids-r11-x86-64.ll \
+      pnacl-avoids-r11-x86-64.c
+  Then the comments below should be pasted into the .ll file,
+  replacing "RUNxxx" with "RUN".
+
+; The NACLON test verifies that %r11 and %r11d are not used except as
+; part of the return sequence.
+;
+; RUNxxx: pnacl-llc -O2 -mtriple=x86_64-none-nacl < %s | \
+; RUNxxx:     FileCheck %s --check-prefix=NACLON
+;
+; The NACLOFF test verifies that %r11 would normally be used if PNaCl
+; weren't reserving r11 for its own uses, to be sure NACLON is a
+; valid test.
+;
+; RUNxxx: pnacl-llc -O2 -mtriple=x86_64-linux < %s | \
+; RUNxxx:     FileCheck %s --check-prefix=NACLOFF
+;
+; NACLON: RegisterPressure:
+; NACLON-NOT: %r11
+; NACLON: popq %r11
+; NACLON: nacljmp %r11, %r15
+;
+; NACLOFF: RegisterPressure:
+; NACLOFF: %r11
+; NACLOFF: ret
+
+*/
+
+// Function RegisterPressure() tries to induce maximal integer
+// register pressure in a ~16 register machine, for both scratch and
+// preserved registers.  Repeated calls to Use() are designed to
+// use all the preserved registers.  The calculations on the local
+// variables between function calls are designed to use all the
+// scratch registers.
+
+void RegisterPressure(void)
+{
+  extern void Use(int, int, int, int, int, int, int, int,
+                  int, int, int, int, int, int, int, int);
+  extern int GetValue(void);
+  extern volatile int v1a, v1b, v2a, v2b, v3a, v3b, v4a, v4b;
+
+  int i00 = GetValue();
+  int i01 = GetValue();
+  int i02 = GetValue();
+  int i03 = GetValue();
+  int i04 = GetValue();
+  int i05 = GetValue();
+  int i06 = GetValue();
+  int i07 = GetValue();
+  int i08 = GetValue();
+  int i09 = GetValue();
+  int i10 = GetValue();
+  int i11 = GetValue();
+  int i12 = GetValue();
+  int i13 = GetValue();
+  int i14 = GetValue();
+  int i15 = GetValue();
+
+  Use(i00, i01, i02, i03, i04, i05, i06, i07,
+      i08, i09, i10, i11, i12, i13, i14, i15);
+  Use(i00, i01, i02, i03, i04, i05, i06, i07,
+      i08, i09, i10, i11, i12, i13, i14, i15);
+  v1a = i00 + i01 + i02 + i03 + i04 + i05 + i06 + i07;
+  v1b = i08 + i09 + i10 + i11 + i12 + i13 + i14 + i15;
+  v2a = i00 + i01 + i02 + i03 + i08 + i09 + i10 + i11;
+  v2b = i04 + i05 + i06 + i07 + i12 + i13 + i14 + i15;
+  v3a = i00 + i01 + i04 + i05 + i08 + i09 + i12 + i13;
+  v3b = i02 + i03 + i06 + i07 + i10 + i11 + i14 + i15;
+  v4a = i00 + i02 + i04 + i06 + i08 + i10 + i12 + i14;
+  v4b = i01 + i03 + i05 + i07 + i09 + i11 + i13 + i15;
+  Use(i00, i01, i02, i03, i04, i05, i06, i07,
+      i08, i09, i10, i11, i12, i13, i14, i15);
+  Use(i00, i01, i02, i03, i04, i05, i06, i07,
+      i08, i09, i10, i11, i12, i13, i14, i15);
+}