From 4990adec9d982b32b863486b4a1d01f286955ae3 Mon Sep 17 00:00:00 2001 From: Nora Sandler Date: Tue, 9 Apr 2024 01:28:34 +0000 Subject: [PATCH] test cases for not coalescing pseudoreg/hardreg pairs that fail george test --- expected_results.json | 2 +- test_framework/regalloc.py | 2 + test_properties.json | 6 ++ .../with_coalescing/george_dont_coalesce.c | 46 +++++++++++++++ .../with_coalescing/george_dont_coalesce_2.c | 57 +++++++++++++++++++ 5 files changed, 112 insertions(+), 1 deletion(-) create mode 100644 tests/chapter_20/int_only/with_coalescing/george_dont_coalesce.c create mode 100644 tests/chapter_20/int_only/with_coalescing/george_dont_coalesce_2.c diff --git a/expected_results.json b/expected_results.json index 2b2fc600..60893617 100644 --- a/expected_results.json +++ b/expected_results.json @@ -1 +1 @@ -{"chapter_6/valid/rh_assignment.c": {"return_code": 1}, "chapter_6/valid/if_nested_2.c": {"return_code": 2}, "chapter_6/valid/if_nested_3.c": {"return_code": 3}, 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"chapter_20/int_only/no_coalescing/bin_uses_operands.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/division_uses_ax.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/cmp_generates_operands.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/eax_live_at_exit.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/unary_uses_operand.c": {"return_code": 0}, "chapter_20/int_only/no_coalescing/funcall_generates_args.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/briggs_coalesce_hardreg.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/briggs_dont_coalesce.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/george_dont_coalesce_2.c": {"return_code": 0}, "chapter_20/int_only/with_coalescing/george_dont_coalesce.c": {"return_code": 0}} \ No newline at end of file diff --git a/test_framework/regalloc.py b/test_framework/regalloc.py index 84f4ae0d..e6657907 100644 --- a/test_framework/regalloc.py +++ b/test_framework/regalloc.py @@ -336,6 +336,8 @@ class CoalesceTest(NamedTuple): "coalesce_prevents_spill.c": CoalesceTest(max_moves=18), "briggs_coalesce_hardreg.c": CoalesceTest(), "briggs_dont_coalesce.c": CoalesceTest(max_moves=7), + "george_dont_coalesce.c": CoalesceTest(max_moves=31), + "george_dont_coalesce_2.c": CoalesceTest(max_moves=21), } diff --git a/test_properties.json b/test_properties.json index fbdfdcf7..63f36d9d 100644 --- a/test_properties.json +++ b/test_properties.json @@ -476,6 +476,12 @@ ], "chapter_20/int_only/with_coalescing/briggs_dont_coalesce.c": [ "chapter_20/libraries/util.c" + ], + "chapter_20/int_only/with_coalescing/george_dont_coalesce.c": [ + "chapter_20/libraries/util.c" + ], + "chapter_20/int_only/with_coalescing/george_dont_coalesce_2.c": [ + "chapter_20/libraries/util.c" ] }, "assembly_libs": { diff --git a/tests/chapter_20/int_only/with_coalescing/george_dont_coalesce.c b/tests/chapter_20/int_only/with_coalescing/george_dont_coalesce.c new file mode 100644 index 00000000..b72cb651 --- /dev/null +++ b/tests/chapter_20/int_only/with_coalescing/george_dont_coalesce.c @@ -0,0 +1,46 @@ +/* Test that we don't coalesce a pseudo into a hardreg if they fail the George + * and Briggs tests - specifically when they're connected by a mov of the form + * movl %hardreg, %pseudo. (For the equivalent test with movl %pseudo, %hardreg, + * see george_dont_coalesce_2.c) Coalescing registers that fail the George test + * here would force us to spill; we inspect the assembly for target to make + * sure there are no spills. + * */ + +#include "../../libraries/util.h" + +int glob = 1; + +// a-f have values 1-6 +int target(int a, int b, int c, int d, int e, int f) { + // a-f interfere with g-l, g-l interfere wih m-q, and m-q interfere with + // all the param-passing registers. The only way to avoid spills is to put + // at least five of a-f in non-param-passing registers, so we can put at + // least five of pseudos g-l in param-passing registers, leaving five + // non-param-passing registers available for m-q. This means we can't + // coalesce all of a-f into parameter-passing registers. + + // define g-l (values 7-12) + int g = a + f; // 7 + int h = b * d; // 8 + int i = c * c; // 9 + int j = d + f; // 10 + int k = e + f; // 11 + int l = f * b; // 12 + + // define m-q; use a-f in initializer for m to make them interfere with g-l + int m = (a + b + c + d + e + f) - 7; // 14 + int n = g + h; // 15 + int o = i + 7; // 16 + int p = j * 2 - 3; // 17 + int q = k + g; // 18 + // this makes m-q conflict w/ all param-passing registers + check_12_ints(g, h, i, j, k, l, 13, m, n, o, p, q, 7); + return 0; +} + +int target2(void) { + // a-e are callee-saved + // they interfere with f-k, which must therefore be caller-saved + // which interfere with l-p, which must be callee-save + // but we pass l-p as arugments +} \ No newline at end of file diff --git a/tests/chapter_20/int_only/with_coalescing/george_dont_coalesce_2.c b/tests/chapter_20/int_only/with_coalescing/george_dont_coalesce_2.c new file mode 100644 index 00000000..28ddfac0 --- /dev/null +++ b/tests/chapter_20/int_only/with_coalescing/george_dont_coalesce_2.c @@ -0,0 +1,57 @@ +/* Test that we don't coalesce a pseudo into a hardreg if they fail the George + * and Briggs tests - specifically, when they're connected by a mov of the form + * movl %pseudoreg, %hardreg. (See george_dont_coalesce.c for an equivalent + * test where the hardreg is the first instruction.) Coalescing registers + * that fail the George test here wOuld force us to spill, so we inspect the + * assembly for target to make sure there are no spills. + * */ + +#include "../../libraries/util.h" + +int glob = 1; + +int update_glob(void) { + glob = 0; + return 0; +} + +int target(void) { + // a-e interfere with f-k, and f-k interfere with l-p. a-e must be + // callee-saved, so to avoid spills, f-k must be caller-saved, so + // at least four of l-p must be callee-saved. We pass l-p as arguments in + // parameter-passing registers, but coalescing them into those registers + // will cause a spill. + + // define a-e (values 2-6) + int a = glob * 2; // 2 + int b = glob * 3; // 3 + int c = glob * 4; // 4 + int d = glob * 5; // 5 + int e = glob * 6; // 6 + // force a-e to be callee-saved + update_glob(); + // define f-k (values 7-12) + int f = a + d; // 7 + int g = b * 3 - 1; // 8 + int h = c + d; // 9; + int i = c + e; // 10 + int j = d * 2 + 1; // 11 + int k = e * 2; // 12 + // define l using a-e, to make sure they all conflict with f-k + int l = a + b + c + d + e; // 20 + int m = 3 * f; // 21 + int n = g * 3 - 2; // 22 + int o = h * 2 + 5; // 23 + int p = i * 2 + 4; // 24 + + // use all of f-k here, to make them conflict with l-p + glob = glob + f + g + h + i + j + k; // 57 + + // now pass l-p as arguments; George test should prevent us from coalescing + // them into param-passing registers + check_5_ints(l, m, n, o, p, 20); + + // and validate glob too + check_one_int(glob, 57); + return 0; +}