Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/CodeGen/Mips/no-odd-spreg.ll

@@ -0,0 +1,61 @@
+; RUN: llc -march=mipsel -mcpu=mips32 < %s | FileCheck %s -check-prefixes=ALL,ODDSPREG,ODDSPREG-NO-EMIT
+; RUN: llc -march=mipsel -mcpu=mips32 -mattr=+nooddspreg < %s | FileCheck %s -check-prefixes=ALL,NOODDSPREG
+; RUN: llc -march=mipsel -mcpu=mips32r6 -mattr=fp64 < %s | FileCheck %s -check-prefixes=ALL,ODDSPREG,ODDSPREG-NO-EMIT
+; RUN: llc -march=mipsel -mcpu=mips32r6 -mattr=fp64,+nooddspreg < %s | FileCheck %s -check-prefixes=ALL,NOODDSPREG
+; RUN: llc -march=mipsel -mcpu=mips32r6 -mattr=fpxx,-nooddspreg < %s | FileCheck %s -check-prefixes=ALL,ODDSPREG,ODDSPREG-EMIT
+
+; We don't emit a directive unless we need to. This is to support versions of
+; GAS which do not support the directive.
+; ODDSPREG-EMIT:        .module oddspreg
+; ODDSPREG-NO-EMIT-NOT: .module oddspreg
+; NOODDSPREG:           .module nooddspreg
+
+define float @two_floats(float %a) {
+entry:
+  ; Clobber all except $f12 and $f13
+  ;
+  ; The intention is that if odd single precision registers are permitted, the
+  ; allocator will choose $f12 and $f13 to avoid the spill/reload.
+  ;
+  ; On the other hand, if odd single precision registers are not permitted, it
+  ; will be forced to spill/reload either %a or %0.
+  ;
+  ; This is affected by scheduling as the new machine scheduler schedules the
+  ; two adds together, avoiding the spill+reload.
+
+  %0 = fadd float %a, 1.0
+  call void asm "# Clobber", "~{$f0},~{$f1},~{$f2},~{$f3},~{$f4},~{$f5},~{$f6},~{$f7},~{$f8},~{$f9},~{$f10},~{$f11},~{$f14},~{$f15},~{$f16},~{$f17},~{$f18},~{$f19},~{$f20},~{$f21},~{$f22},~{$f23},~{$f24},~{$f25},~{$f26},~{$f27},~{$f28},~{$f29},~{$f30},~{$f31}"()
+  %1 = fadd float %a, %0
+  ret float %1
+}
+
+; ALL-LABEL:  two_floats:
+; ODDSPREG:       add.s $f[[RES:[0-9]]], $f12, ${{f[0-9]+}}
+; ODDSPREG:       add.s ${{f[0-9]+}}, $f12, $f[[RES]]
+; ODDSPREG-NOT:   swc1
+; ODDSPREG-NOT:   lwc1
+
+; NOODDSPREG:     add.s $[[T0:f[0-9]*[02468]]], $f12, ${{f[0-9]+}}
+; NOODDSPREG-NOT: swc1 $[[T0]],
+; NOODDSPREG-NOT: lwc1 $[[T1:f[0-9]*[02468]]],
+; NOODDSPREG:     add.s ${{f[0-9]+}}, $f12, $[[T0]]
+
+define double @two_doubles(double %a) {
+entry:
+  ; Clobber all except $f12 and $f13
+  ;
+  ; -mno-odd-sp-reg doesn't need to affect double precision values so both cases
+  ; use $f12 and $f13.
+
+  %0 = fadd double %a, 1.0
+  call void asm "# Clobber", "~{$f0},~{$f1},~{$f2},~{$f3},~{$f4},~{$f5},~{$f6},~{$f7},~{$f8},~{$f9},~{$f10},~{$f11},~{$f14},~{$f15},~{$f16},~{$f17},~{$f18},~{$f19},~{$f20},~{$f21},~{$f22},~{$f23},~{$f24},~{$f25},~{$f26},~{$f27},~{$f28},~{$f29},~{$f30},~{$f31}"()
+  %1 = fadd double %a, %0
+  ret double %1
+}
+
+; ALL-LABEL: two_doubles:
+; ALL-DAG:        add.d $[[T0:f[0-9]+]], $f12, ${{f[0-9]+}}
+; ALL-DAG:        add.d $f0, $f12, $[[T0]]
+
+
+; INVALID: -mattr=+nooddspreg is not currently permitted for a 32-bit FPU register file (FR=0 mode).