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TheRock/compiler/amd-llvm/llvm/test/CodeGen/NVPTX/combine-mad.ll
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

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LLVM
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc < %s -mtriple=nvptx -mcpu=sm_20 -O1 | FileCheck %s
; RUN: llc < %s -mtriple=nvptx64 -mcpu=sm_20 -O1 | FileCheck %s
; RUN: %if ptxas-ptr32 %{ llc < %s -mtriple=nvptx -mcpu=sm_20 -O1 | %ptxas-verify %}
; RUN: %if ptxas %{ llc < %s -mtriple=nvptx64 -mcpu=sm_20 -O1 | %ptxas-verify %}
define i32 @test1(i32 %n, i32 %m) {
;
; CHECK-LABEL: test1(
; CHECK: {
; CHECK-NEXT: .reg .b32 %r<4>;
; CHECK-EMPTY:
; CHECK-NEXT: // %bb.0:
; CHECK-NEXT: ld.param.b32 %r1, [test1_param_0];
; CHECK-NEXT: ld.param.b32 %r2, [test1_param_1];
; CHECK-NEXT: mad.lo.s32 %r3, %r2, %r1, %r2;
; CHECK-NEXT: st.param.b32 [func_retval0], %r3;
; CHECK-NEXT: ret;
%add = add i32 %n, 1
%mul = mul i32 %add, %m
ret i32 %mul
}
define i32 @test1_rev(i32 %n, i32 %m) {
;
; CHECK-LABEL: test1_rev(
; CHECK: {
; CHECK-NEXT: .reg .b32 %r<4>;
; CHECK-EMPTY:
; CHECK-NEXT: // %bb.0:
; CHECK-NEXT: ld.param.b32 %r1, [test1_rev_param_0];
; CHECK-NEXT: ld.param.b32 %r2, [test1_rev_param_1];
; CHECK-NEXT: mad.lo.s32 %r3, %r2, %r1, %r2;
; CHECK-NEXT: st.param.b32 [func_retval0], %r3;
; CHECK-NEXT: ret;
%add = add i32 %n, 1
%mul = mul i32 %m, %add
ret i32 %mul
}
; Transpose (mul (select)) if it can then be folded to mad
define i32 @test2(i32 %n, i32 %m, i32 %s) {
;
; CHECK-LABEL: test2(
; CHECK: {
; CHECK-NEXT: .reg .pred %p<2>;
; CHECK-NEXT: .reg .b32 %r<6>;
; CHECK-EMPTY:
; CHECK-NEXT: // %bb.0:
; CHECK-NEXT: ld.param.b32 %r1, [test2_param_0];
; CHECK-NEXT: ld.param.b32 %r2, [test2_param_1];
; CHECK-NEXT: ld.param.b32 %r3, [test2_param_2];
; CHECK-NEXT: setp.lt.s32 %p1, %r3, 1;
; CHECK-NEXT: mad.lo.s32 %r4, %r2, %r1, %r2;
; CHECK-NEXT: selp.b32 %r5, %r2, %r4, %p1;
; CHECK-NEXT: st.param.b32 [func_retval0], %r5;
; CHECK-NEXT: ret;
%add = add i32 %n, 1
%cond = icmp slt i32 %s, 1
%sel = select i1 %cond, i32 1, i32 %add
%mul = mul i32 %sel, %m
ret i32 %mul
}
;; Transpose (mul (select)) if it can then be folded to mad
define i32 @test2_rev1(i32 %n, i32 %m, i32 %s) {
;
; CHECK-LABEL: test2_rev1(
; CHECK: {
; CHECK-NEXT: .reg .pred %p<2>;
; CHECK-NEXT: .reg .b32 %r<6>;
; CHECK-EMPTY:
; CHECK-NEXT: // %bb.0:
; CHECK-NEXT: ld.param.b32 %r1, [test2_rev1_param_0];
; CHECK-NEXT: ld.param.b32 %r2, [test2_rev1_param_1];
; CHECK-NEXT: ld.param.b32 %r3, [test2_rev1_param_2];
; CHECK-NEXT: setp.lt.s32 %p1, %r3, 1;
; CHECK-NEXT: mad.lo.s32 %r4, %r2, %r1, %r2;
; CHECK-NEXT: selp.b32 %r5, %r4, %r2, %p1;
; CHECK-NEXT: st.param.b32 [func_retval0], %r5;
; CHECK-NEXT: ret;
%add = add i32 %n, 1
%cond = icmp slt i32 %s, 1
%sel = select i1 %cond, i32 %add, i32 1
%mul = mul i32 %sel, %m
ret i32 %mul
}
;; Transpose (mul (select)) if it can then be folded to mad
define i32 @test2_rev2(i32 %n, i32 %m, i32 %s) {
;
; CHECK-LABEL: test2_rev2(
; CHECK: {
; CHECK-NEXT: .reg .pred %p<2>;
; CHECK-NEXT: .reg .b32 %r<6>;
; CHECK-EMPTY:
; CHECK-NEXT: // %bb.0:
; CHECK-NEXT: ld.param.b32 %r1, [test2_rev2_param_0];
; CHECK-NEXT: ld.param.b32 %r2, [test2_rev2_param_1];
; CHECK-NEXT: ld.param.b32 %r3, [test2_rev2_param_2];
; CHECK-NEXT: setp.lt.s32 %p1, %r3, 1;
; CHECK-NEXT: mad.lo.s32 %r4, %r2, %r1, %r2;
; CHECK-NEXT: selp.b32 %r5, %r4, %r2, %p1;
; CHECK-NEXT: st.param.b32 [func_retval0], %r5;
; CHECK-NEXT: ret;
%add = add i32 %n, 1
%cond = icmp slt i32 %s, 1
%sel = select i1 %cond, i32 %add, i32 1
%mul = mul i32 %m, %sel
ret i32 %mul
}
;; Leave (mul (select)) intact if it transposing is not profitable
define i32 @test3(i32 %n, i32 %m, i32 %s) {
;
; CHECK-LABEL: test3(
; CHECK: {
; CHECK-NEXT: .reg .pred %p<2>;
; CHECK-NEXT: .reg .b32 %r<7>;
; CHECK-EMPTY:
; CHECK-NEXT: // %bb.0:
; CHECK-NEXT: ld.param.b32 %r1, [test3_param_0];
; CHECK-NEXT: add.s32 %r2, %r1, 3;
; CHECK-NEXT: ld.param.b32 %r3, [test3_param_1];
; CHECK-NEXT: ld.param.b32 %r4, [test3_param_2];
; CHECK-NEXT: setp.lt.s32 %p1, %r4, 1;
; CHECK-NEXT: selp.b32 %r5, 1, %r2, %p1;
; CHECK-NEXT: mul.lo.s32 %r6, %r5, %r3;
; CHECK-NEXT: st.param.b32 [func_retval0], %r6;
; CHECK-NEXT: ret;
%add = add i32 %n, 3
%cond = icmp slt i32 %s, 1
%sel = select i1 %cond, i32 1, i32 %add
%mul = mul i32 %sel, %m
ret i32 %mul
}
;; (add (select 0, (mul a, b)), c) -> (select (mad a, b, c), c)
define i32 @test4(i32 %a, i32 %b, i32 %c, i1 %p) {
; CHECK-LABEL: test4(
; CHECK: {
; CHECK-NEXT: .reg .pred %p<2>;
; CHECK-NEXT: .reg .b16 %rs<3>;
; CHECK-NEXT: .reg .b32 %r<6>;
; CHECK-EMPTY:
; CHECK-NEXT: // %bb.0:
; CHECK-NEXT: ld.param.b8 %rs1, [test4_param_3];
; CHECK-NEXT: and.b16 %rs2, %rs1, 1;
; CHECK-NEXT: setp.ne.b16 %p1, %rs2, 0;
; CHECK-NEXT: ld.param.b32 %r1, [test4_param_0];
; CHECK-NEXT: ld.param.b32 %r2, [test4_param_1];
; CHECK-NEXT: ld.param.b32 %r3, [test4_param_2];
; CHECK-NEXT: mad.lo.s32 %r4, %r1, %r2, %r3;
; CHECK-NEXT: selp.b32 %r5, %r4, %r3, %p1;
; CHECK-NEXT: st.param.b32 [func_retval0], %r5;
; CHECK-NEXT: ret;
%mul = mul i32 %a, %b
%sel = select i1 %p, i32 %mul, i32 0
%add = add i32 %c, %sel
ret i32 %add
}
define i32 @test4_rev(i32 %a, i32 %b, i32 %c, i1 %p) {
; CHECK-LABEL: test4_rev(
; CHECK: {
; CHECK-NEXT: .reg .pred %p<2>;
; CHECK-NEXT: .reg .b16 %rs<3>;
; CHECK-NEXT: .reg .b32 %r<6>;
; CHECK-EMPTY:
; CHECK-NEXT: // %bb.0:
; CHECK-NEXT: ld.param.b8 %rs1, [test4_rev_param_3];
; CHECK-NEXT: and.b16 %rs2, %rs1, 1;
; CHECK-NEXT: setp.ne.b16 %p1, %rs2, 0;
; CHECK-NEXT: ld.param.b32 %r1, [test4_rev_param_0];
; CHECK-NEXT: ld.param.b32 %r2, [test4_rev_param_1];
; CHECK-NEXT: ld.param.b32 %r3, [test4_rev_param_2];
; CHECK-NEXT: mad.lo.s32 %r4, %r1, %r2, %r3;
; CHECK-NEXT: selp.b32 %r5, %r3, %r4, %p1;
; CHECK-NEXT: st.param.b32 [func_retval0], %r5;
; CHECK-NEXT: ret;
%mul = mul i32 %a, %b
%sel = select i1 %p, i32 0, i32 %mul
%add = add i32 %c, %sel
ret i32 %add
}
declare i32 @use(i32 %0, i32 %1)
define i32 @test_mad_multi_use(i32 %a, i32 %b, i32 %c) {
; CHECK-LABEL: test_mad_multi_use(
; CHECK: {
; CHECK-NEXT: .reg .b32 %r<7>;
; CHECK-EMPTY:
; CHECK-NEXT: // %bb.0:
; CHECK-NEXT: ld.param.b32 %r1, [test_mad_multi_use_param_0];
; CHECK-NEXT: ld.param.b32 %r2, [test_mad_multi_use_param_1];
; CHECK-NEXT: mul.lo.s32 %r3, %r1, %r2;
; CHECK-NEXT: ld.param.b32 %r4, [test_mad_multi_use_param_2];
; CHECK-NEXT: add.s32 %r5, %r3, %r4;
; CHECK-NEXT: { // callseq 0, 0
; CHECK-NEXT: .param .b32 param0;
; CHECK-NEXT: .param .b32 param1;
; CHECK-NEXT: .param .b32 retval0;
; CHECK-NEXT: st.param.b32 [param0], %r3;
; CHECK-NEXT: st.param.b32 [param1], %r5;
; CHECK-NEXT: call.uni (retval0), use, (param0, param1);
; CHECK-NEXT: ld.param.b32 %r6, [retval0];
; CHECK-NEXT: } // callseq 0
; CHECK-NEXT: st.param.b32 [func_retval0], %r6;
; CHECK-NEXT: ret;
%mul = mul i32 %a, %b
%add = add i32 %mul, %c
%res = call i32 @use(i32 %mul, i32 %add)
ret i32 %res
}
;; This case relies on mad x 1 y => add x y, previously we emit:
;; mad.lo.s32 %r3, %r1, 1, %r2;
define i32 @test_mad_fold(i32 %x) {
; CHECK-LABEL: test_mad_fold(
; CHECK: {
; CHECK-NEXT: .reg .b32 %r<7>;
; CHECK-EMPTY:
; CHECK-NEXT: // %bb.0:
; CHECK-NEXT: ld.param.b32 %r1, [test_mad_fold_param_0];
; CHECK-NEXT: mul.hi.s32 %r2, %r1, -2147221471;
; CHECK-NEXT: add.s32 %r3, %r2, %r1;
; CHECK-NEXT: shr.u32 %r4, %r3, 31;
; CHECK-NEXT: shr.s32 %r5, %r3, 12;
; CHECK-NEXT: add.s32 %r6, %r5, %r4;
; CHECK-NEXT: st.param.b32 [func_retval0], %r6;
; CHECK-NEXT: ret;
%div = sdiv i32 %x, 8191
ret i32 %div
}
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