1; Test sibling calls. 2; 3; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s 4 5declare void @ok(i8 %r2, i16 %r3, i32 %r4, i64 %r5, float %f0, double %f2, 6 float %f4, double %f6) 7declare void @uses_r6(i8 %r2, i16 %r3, i32 %r4, i64 %r5, i64 %r6) 8declare void @uses_indirect(fp128 %r2) 9declare void @uses_stack(float %f0, float %f2, float %f4, float %f6, 10 float %stack) 11declare i32 @returns_i32() 12declare i64 @returns_i64() 13 14; Check the maximum number of arguments that we can pass and still use 15; a sibling call. 16define void @f1() { 17; CHECK-LABEL: f1: 18; CHECK-DAG: lzer %f0 19; CHECK-DAG: lzdr %f2 20; CHECK-DAG: lhi %r2, 1 21; CHECK-DAG: lhi %r3, 2 22; CHECK-DAG: lhi %r4, 3 23; CHECK-DAG: lghi %r5, 4 24; CHECK-DAG: {{ler %f4, %f0|lzer %f4}} 25; CHECK-DAG: {{ldr %f6, %f2|lzdr %f6}} 26; CHECK: jg ok@PLT 27 tail call void @ok(i8 1, i16 2, i32 3, i64 4, float 0.0, double 0.0, 28 float 0.0, double 0.0) 29 ret void 30} 31 32; Check a call that uses %r6 to pass an argument. At the moment we don't 33; use sibling calls in that case. 34define void @f2() { 35; CHECK-LABEL: f2: 36; CHECK: brasl %r14, uses_r6@PLT 37; CHECK: br %r14 38 tail call void @uses_r6(i8 1, i16 2, i32 3, i64 4, i64 5) 39 ret void 40} 41 42; Check a call that passes indirect arguments. We can't use sibling 43; calls in that case. 44define void @f3() { 45; CHECK-LABEL: f3: 46; CHECK: brasl %r14, uses_indirect@PLT 47; CHECK: br %r14 48 tail call void @uses_indirect(fp128 0xL00000000000000000000000000000000) 49 ret void 50} 51 52; Check a call that uses direct stack arguments, which again prevents 53; sibling calls 54define void @f4() { 55; CHECK-LABEL: f4: 56; CHECK: brasl %r14, uses_stack@PLT 57; CHECK: br %r14 58 tail call void @uses_stack(float 0.0, float 0.0, float 0.0, float 0.0, 59 float 0.0) 60 ret void 61} 62 63; Check an indirect call. In this case the only acceptable choice for 64; the target register is %r1. 65define void @f5(void(i32, i32, i32, i32) *%foo) { 66; CHECK-LABEL: f5: 67; CHECK: lgr %r1, %r2 68; CHECK-DAG: lhi %r2, 1 69; CHECK-DAG: lhi %r3, 2 70; CHECK-DAG: lhi %r4, 3 71; CHECK-DAG: lhi %r5, 4 72; CHECK: br %r1 73 tail call void %foo(i32 1, i32 2, i32 3, i32 4) 74 ret void 75} 76 77; Check an indirect call that will be forced into a call-saved GPR 78; (which should be %r13, the highest GPR not used for anything else). 79define void @f6(void(i32) *%foo) { 80; CHECK-LABEL: f6: 81; CHECK: stmg %r13, %r15, 104(%r15) 82; CHECK: lgr %r13, %r2 83; CHECK: brasl %r14, returns_i32 84; CHECK: lgr %r1, %r13 85; CHECK: lmg %r13, %r15, 264(%r15) 86; CHECK: br %r1 87 %arg = call i32 @returns_i32() 88 tail call void %foo(i32 %arg) 89 ret void 90} 91 92; Test a function that returns a value. 93define i64 @f7() { 94; CHECK-LABEL: f7: 95; CHECK: jg returns_i64@PLT 96 %res = tail call i64 @returns_i64() 97 ret i64 %res 98} 99 100; Test a function that returns a value truncated from i64 to i32. 101define i32 @f8() { 102; CHECK-LABEL: f8: 103; CHECK: jg returns_i64@PLT 104 %res = tail call i64 @returns_i64() 105 %trunc = trunc i64 %res to i32 106 ret i32 %trunc 107} 108 109; Test a function that returns a value truncated from i64 to i7. 110define i7 @f9() { 111; CHECK-LABEL: f9: 112; CHECK: jg returns_i64@PLT 113 %res = tail call i64 @returns_i64() 114 %trunc = trunc i64 %res to i7 115 ret i7 %trunc 116} 117 118; Test a function that returns a value truncated from i32 to i8. 119define i8 @f10() { 120; CHECK-LABEL: f10: 121; CHECK: jg returns_i32@PLT 122 %res = tail call i32 @returns_i32() 123 %trunc = trunc i32 %res to i8 124 ret i8 %trunc 125} 126