diff mbox series

[4/6,CRIS,cc0-preparations] gcc.target/cris/pr93372-2.c, -5.c, -8.c: New tests.

Message ID 202002101659.01AGxMff012654@ignucius.se.axis.com
State New
Headers show
Series [1/6,CRIS,cc0-preparations] try to generate zero-based comparisons | expand

Commit Message

Hans-Peter Nilsson Feb. 10, 2020, 4:59 p.m. UTC 
* gcc.target/cris/pr93372-2.c, gcc.target/cris/pr93372-5.c,
gcc.target/cris/pr93372-8.c: New tests.

These tests fails miserably both at being an example of cc0
eliminating compare instructions, and post-cc0-CRIS at showing a
significant improvement.  They're here to track suboptimal
comparison code for CRIS.
---
 gcc/testsuite/gcc.target/cris/pr93372-2.c | 19 +++++++++++++++++++
 gcc/testsuite/gcc.target/cris/pr93372-5.c | 19 +++++++++++++++++++
 gcc/testsuite/gcc.target/cris/pr93372-8.c | 16 ++++++++++++++++
 3 files changed, 54 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/cris/pr93372-2.c
 create mode 100644 gcc/testsuite/gcc.target/cris/pr93372-5.c
 create mode 100644 gcc/testsuite/gcc.target/cris/pr93372-8.c
diff mbox series

Patch

diff --git a/gcc/testsuite/gcc.target/cris/pr93372-2.c b/gcc/testsuite/gcc.target/cris/pr93372-2.c
new file mode 100644
index 000000000..912069c01
--- /dev/null
+++ b/gcc/testsuite/gcc.target/cris/pr93372-2.c
@@ -0,0 +1,19 @@ 
+/* Check that eliminable compare-instructions are eliminated. */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler-not "\tcmp|\ttest" { xfail *-*-* } } } */
+/* { dg-final { scan-assembler-not "\tnot" { xfail cc0 } } } */
+/* { dg-final { scan-assembler-not "\tlsr" { xfail cc0 } } } */
+
+int f(int a, int b, int *d)
+{
+  int c = a - b;
+
+  /* Whoops!  We get a cmp.d with the original operands here. */
+  *d = (c == 0);
+
+  /* Whoops!  While we don't get a test.d for the result here for cc0,
+     we get a sequence of insns: a move, a "not" and a shift of the
+     subtraction-result, where a simple "spl" would have done. */
+  return c >= 0;
+}
diff --git a/gcc/testsuite/gcc.target/cris/pr93372-5.c b/gcc/testsuite/gcc.target/cris/pr93372-5.c
new file mode 100644
index 000000000..351764c6c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/cris/pr93372-5.c
@@ -0,0 +1,19 @@ 
+/* Check that eliminable compare-instructions are eliminated. */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler-not "\tcmp|\ttest|\tor" { xfail *-*-* } } } */
+/* { dg-final { scan-assembler-not "\tnot" { xfail cc0 } } } */
+/* { dg-final { scan-assembler-not "\tlsr" { xfail cc0 } } } */
+
+int f(long long int a, long long int b, int *d)
+{
+  long long int c = a - b;
+
+  *d = (c == 0LL);
+
+  /* See pr93372-2.c; we have the same problem for DImode, but it's
+     worsened by the generic double-word "optimizations"; or:ing
+     together the DI parts and then testing the result for the equality
+     test.  */
+  return c >= 0LL;
+}
diff --git a/gcc/testsuite/gcc.target/cris/pr93372-8.c b/gcc/testsuite/gcc.target/cris/pr93372-8.c
new file mode 100644
index 000000000..95abc4b6b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/cris/pr93372-8.c
@@ -0,0 +1,16 @@ 
+/* Check that eliminable compare-instructions are eliminated. */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* See pr93372-5.c regarding the xfails.  */
+/* { dg-final { scan-assembler-not "\tcmp|\ttest|\tor" { xfail *-*-* } } } */
+/* { dg-final { scan-assembler-not "\tnot" { xfail cc0 } } } */
+/* { dg-final { scan-assembler-not "\tlsr" { xfail cc0 } } } */
+
+int f(long long int a, long long int b, int *d)
+{
+  long long int c = a + b;
+
+  *d = (c == 0);
+
+  return c >= 0;
+}